taxonID	type	description	language	source
0C0210596F61FF991E98FEA6FF5EFED2.taxon	description	Typhlo sp. 8 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F61FF991E98FEA6FF5EFED2.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals, two serially sectioned afterwards, one of which is designated holotype (ZMH, No. V 13677) and the other paratype (HU, No. 854), collected in Las Sardinas (type locality) (22 June 2017); silty and very fine-grained sand, 0.5 m deep, salinity 31 ‰. One specimen used for molecular analyses, collected near the Hotel Guamá (October 21, 2020); silty and very fine-grained sand, 0.8 m deep, salinity 32 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F61FF991E98FEA6FF5EFED2.taxon	etymology	Etymology. The epithet refers to the absence of a prostate vesicle.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F61FF991E98FEA6FF5EFED2.taxon	diagnosis	Diagnosis. Provisionally with the same diagnosis of the genus.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F61FF991E98FEA6FF5EFED2.taxon	description	Description. The animals are 0.2 mm long (n = 2), measured on sections, unpigmented, with a pair of eyes (Figs. 1 a, c and 2 a: e). The syncytial and fully ciliated epidermis is 2 – 3 µm thick. The epidermis contains a single type of vacuole, filled with a fine-grained eosinophilic secretion (Fig. 1 c: vc). The rhabdites are globular, 0.5 – 1 µm in diameter, located at the apical side of the epidermis. The cilia are 4 – 5 µm long. Three kinds of sac-shaped glands open at the anterior body end: coarse-grained basophilic ones (stained dark blue-black) (Fig. 1 c: gl 1), fine-grained basophilic ones (stained purplish) (Fig. 1 c: gl 2), and fine-grained eosinophilic ones (stained brownish) (Fig. 1 c: gl 3). The pharynx (Figs. 1 a – c and 2 a – d: ph) is 62 – 77 µm in diameter (x = 70 µm; n = 2), measured on sections, located at 50 %. The prepharyngeal cavity (Fig. 1 c: ppc) is lined with a nucleated epithelium and opens to the outside through the mouth (Figs. 1 c and 2 a, b: m), which is surrounded by a sphincter (Fig. 1 c: sph 1). Three types of glands open in the distal half of the pharyngeal lumen: two types containing a fine-grained eosinophilic secretion (stained brownish and reddish, respectively) (Fig. 1 c: phg 1 and phg 3, respectively) and one containing a coarse-grained basophilic secretion (stained dark blue-black) (Fig. 1 c: phg 2). The musculature of the pharynx includes a thick external layer of circular muscles (Fig. 1 c: cm 1) just inside of the septum. The pharynx lumen is lined by a syncytial epithelium (Fig. 1 c: ep) and an inner circular muscle layer (Fig. 1 c: cm 2). Internal longitudinal muscles are present (Fig. 1 c: ilm). Radial muscles (Fig. 1 c: rm) run between the internal and the external walls. No muscles were observed outside of the septum or around the prepharyngeal cavity. A pair of testes (Fig. 1 a and c: t) is located ventrally, anterior to the pharynx. The vasa deferentia form a pair of seminal vesicles caudal to the pharynx (Figs. 1 c and 2 c: sv). The seminal vesicles are lined by a nucleated epithelium. Distally, the seminal vesicles narrow and open into the copulatory bulb (Figs. 1 b, c and 2 d: cb). The copulatory bulb is an unarmed sac, filled with sperm (see Fig. 2 d: sm) and hence functions as an unpaired seminal vesicle. It is lined with a nucleated epithelium and longitudinal muscles and enters the common genital atrium (Figs. 1 c and 2 a, b: ca) dorsally. A prostate vesicle is absent. Some sperm was also observed in the common genital atrium, which could be an artefact resulting from the fixation of the specimens or residual sperm from previous copulation events. The paired vitellaria (Figs. 1 a, c and 2 c: vi) lie dorsally at each body side, between the brain (Fig. 1 c: br) and the caudal body end. Each vitellarium connects to the respective oviduct (Fig. 1 c: od) just distally to the ovary. The ovaries (Figs. 1 a, c and 2 d: ov) are kidney shaped, with the oocytes proximally diminishing in diameter. The oviducts are lined by a nucleated epithelium, and open into the sac-shaped female duct. The female duct is bipartite: The proximal globular part (Figs. 1 a – c and 2 a – c: fd 1) is filled with sperm and lined by a thin anucleated epithelium. More distally, the female duct forms a second, smaller part: the stalk (Figs. 1 c and 2 a, b: fd 2). The stalk is lined by a nucleated epithelium and longitudinal muscles and opens caudally into the common genital atrium. Muscles were not observed around the oviducts or the proximal part of the female duct. The proximal part of the female duct opens to the outside through a caudal vagina (Figs. 1 c and 2 c: va). The common genital atrium is lined by a low, nucleated epithelium and by longitudinal muscles. It receives fine-grained, eosinophilic glands (Fig. 1 c: eg) through its caudal wall. The common gonopore (Figs. 1 c and 2 a, b: cg) is situated at 80 % and is surrounded by a sphincter (Fig. 1 c: sph 2). Neotyphloplanida Willems et al., 2006 Thalassotyphloplanida Willems et al., 2006 Kytorhynchidae Rieger, 1974 Kytorhynchus Rieger, 1974 Eukytorhynchus Boyko, 1996 Kytorhynchus (Eukytorhynchus) microstylus Rieger, 1974 (Fig. 3 a – d) Kytorhynchus sp. 1 in Diez et al. (2023) Known distribution. Beaufort, NC, USA, and Tobacco Bay, St. George, Bermuda (Rieger, 1974).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F61FF991E98FEA6FF5EFED2.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals, whole mounted afterwards. Five whole mounts from Siboney (7 February 2016 and 5 June 2017) (HU XIX. 2.23 – XIX. 2.27); fine sand with organic matter, 0.5 m deep, salinity 32 ‰. Three whole mounts from Bueycabón (18 November and 14 December 2017; 6 February 2018) (HU XIX. 2.28 – XIX. 2.30), fine silty sand, 0.5 m deep, salinity 31 – 33 ‰. One whole mount from Sardinero (30 ctober 2018) (HU XIX. 2.31), fine sand, 1.4 m deep, salinity 32 ‰. Two specimens used for molecular analyses, one from Siboney and another from Chivirico.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F61FF991E98FEA6FF5EFED2.taxon	discussion	Remarks. Habitus and internal organisation of the specimens from Cuba (Fig. 3 a) are as described by Rieger (1974) in the original description. The funnel-shaped stylet (Fig. 3 b, c: st, Fig. 3 d), with longitudinal folds over its entire length and distally hook shaped, is 23 – 43 µm long (x = 34 µm; n = 9) and 10 – 27 µm wide proximally (x = 17 µm; n = 9). In some specimens, the stylet is complete straight (Fig. 3 c). Kytorhynchus (Eukytorhynchus) yusdieli sp. n. Diez, Reygel & Artois (Fig. 3 e – g) urn: lsid: zoobank. org: act: 31 C 7 F 10 E-BB 15 - 4918 - B 4 AA- 87101 A 70 D 5 CC Kytorhynchus sp. 2 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F61FF991E98FEA6FF5EFED2.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals, whole mounted afterwards. One whole mount from Bueycabón (Type locality) (June 5, 2017), designated holotype (ZMH, No. V 13678), fine silty sand, 0.5 m deep, salinity 31 ‰. Four whole mounts from Sardinero (October 30, 2018 and March 18, 2021) (HU XIX. 2.32 – XIX. 2.35), one specimen collected subtidally, fine sand, 1.4 m deep, three specimens collected subtidally, 0.5 m deep, fine sand, salinity 32 ‰. Four whole mounts from Embarcadero de Cayo Granma, Bahía de Santiago de Cuba (March 5, 2022) (HU XIX. 2.36 – XIX. 2.39), sublittoral, 1 m deep, coarse and shelly sand with organic matter, salinity 35 ‰. One specimen used for molecular analyses, collected in Juraguá (11 May 2021); sublittoral, fine sand, 0.8 mm deep, salinity 34 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F61FF991E98FEA6FF5EFED2.taxon	etymology	Etymology. Species dedicated to Dr. Yusdiel Torres-Cambas (Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Germany), specialist in systematics and evolution of Odonata.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F61FF991E98FEA6FF5EFED2.taxon	diagnosis	Diagnosis. Species of Kytorhynchus with a funnel-shaped stylet ~ 58 µm long, ~ 47 µm wide proximally, and ~ 20 µm wide distally, with longitudinal folds over its entire length.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F61FF991E98FEA6FF5EFED2.taxon	description	Description. The live specimens (Fig. 3 e) are about 1.2 mm long, translucent, without eyes. They are slightly brownish due to the presence of parenchymal glands. The anterior body invagination (Fig. 3 e: in) is well developed, triangular and appears brown. The pharynx (Fig. 3 e: ph) is 225 µm in diameter (n = 1) and located at 70 – 80 %. The testes (Fig. 3 e: t) are located anterior to the pharynx. The vasa deferentia run backward and open proximally into the copulatory bulb. The copulatory bulb is located latero-caudal to the pharynx. The copulatory bulb encloses the seminal vesicle (Fig. 3 e: sv), the prostate vesicle, and the stylet. The funnel-shaped stylet (Fig. 3 e: st, f – g) is 53 – 62 µm long (x = 58 µm; n = 8), 34 – 53 µm wide proximally (x = 47 µm; n = 8), and 15 – 22 µm wide distally (x = 20 µm; n = 8). It shows longitudinal folds over its entire length. The paired vitellaria run dorsally from the anterior part to the caudal body end. The globular ovaries are located caudally.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F65FF981E98FE58FC15FEBD.taxon	description	(Figs. 4 and 5) Known distribution. Bahía Academy, Santa Cruz, Galapagos Islands (Ehlers & Ehlers, 1981).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F65FF981E98FE58FC15FEBD.taxon	materials_examined	Material and distribution. Canary Islands: Observations on live animals. Three whole mounts; ten sagittally; five horizontally; and six transversally oriented serial sections (HU XIX. 2.40 – XIX. 2.50, XIX. 3.01 – XIX. 3.13); and one specimen used for molecular analyses, collected in Lanzarote. Small bay just south of Orzola (7 October 2011), sheltered pool with a direct connection to the ocean; coarse sand with large pieces of lava rocks, 50 – 60 cm under water. Mala (October 13, 2011); intertidal, coarse, mixed, calcareous, volcanic sediment, upper 4 – 6 cm of sand, taken between rocks.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F65FF981E98FE58FC15FEBD.taxon	discussion	Remarks. The sectioned specimens are approximately 0.4 mm long, and 0.2 mm in width, smaller than that ones from The Galapagos (0.7 mm long; Ehlers & Ehlers, 1981). The structure of the epidermis, basal membrane, and subepidermal muscle layer is similar to what is described for other kytorhynchids (see Rieger, 1974). The anterior body invagination (Figs. 4 a – c and 5 a, b: in) and the pharynx (Figs. 4 a, b, d and 5 a, c: ph) are as that described for the specimens from The Galapagos. The gonopore (Fig. 4 d: cg) is located ventrally and subcaudally and opens into the common genital atrium (Figs. 4 d and 5 c: ca). No epithelial nuclei occur in this area. The epithelium is ruffled here, giving the appearance of cilia (pseudociliation). The round copulatory bulb (Figs. 4 b and 5 a, c: cb) is lined with a nucleated epithelium (Fig. 4 d: ep 1) and surrounded by a thin, longitudinal muscle layer (Fig. 4 d: lm). The bulb contains the single seminal vesicle (Figs. 4 a, d and 5 a: sv) and a large prostate vesicle (Figs. 4 a, d and 5 a, c: pv), which empty into a broad, bowl-shaped penis papilla (Fig. 4 a, d: pp). The penis papilla measures 25 – 34 µm in length and 33 – 44 µm in width (n = 2), at its broadest point, and empties in a relatively large male atrium. According to Ehlers and Ehlers (1981), the length of the whole copulatory bulb of N. pacificus is 50 µm. The quality of the holotype of N. pacificus did not allow us to measure the penis papilla. Notwithstanding, this structure in the original drawing of Ehlers and Ehlers (1981: Fig. 15) is approximately 33 µm long, consonant with the measured range of the specimens from Lanzarote. The paired ovaries (Fig. 4 a, d: ov) are located at the caudal body end. The female duct (Figs. 4 d and 5 a, c: fd) is lined with a high, nucleated epithelium (Fig. 4 d: ep 2) and forms two seminal receptacles (Fig. 4 d: sr), separated by a constriction. However, the bundles of glands entering the female duct and described from the specimens from The Galapagos were not observed in the specimens from Lanzarote.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F64FF861D20FEA6FAC9F89F.taxon	description	(Figs. 6 a, b, 7 a and 8 a – c) urn: lsid: zoobank. org: act: C 1 DF 3 F 85 - E 74 E- 4848 - B 2 C 7 - A 46 E 97 FA 8 AC 5 Gaziella sp. 1 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F64FF861D20FEA6FAC9F89F.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals, whole mounted afterwards. Two specimens used for molecular analyses and four whole mounts from Bueycabón (type locality) (6 and 21 February 2018), one of which is designated holotype (ZMH, No. V 13679) and the others paratypes (HU, No. 855 – 857); fine-grained sand with organic matter, 0.5 m deep, salinity 35 ‰. Four whole mounts from Playa Morales (January 4, 2017) (HU XIX. 3.14 – XIX. 3.17); sandymuddy bottom in a bed of T. testudinum, 0.5 m deep, salinity 35 ‰. One whole mount from Siboney (March 6, 2018) (HU XIX. 3.28), sublittoral, 0.5 m deep, fine-grained sand rich in organic matter, salinity 33 ‰. Four whole mounts from Playa Caletón (26 January 2020) (HU XIX. 3.18 – XIX. 3.21); sublittoral, 0.5 m deep, fine-grained sand around bed of S. filiforme, salinity 37 ‰. Three whole mounts from Juraguá (9 February 2020) (HU XIX. 3.22 – XIX. 3.24); two specimens collected subtidally, 1 m deep, fine-grained sand, and one specimen collected intertidally, upper 20 cm of medium-grained sand, salinity 33 ‰. Three whole mounts from Hotel Guamá (October 21, 2020) (HU XIX. 3.25 – XIX. 3.27); sublittoral, fine-grained and silty sand, 0.8 m deep, salinity 32 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F64FF861D20FEA6FAC9F89F.taxon	etymology	Etymology. The epithet refers to the spiralised distal cap of the copulatory bulb. Lat. Cochleatus: spiral.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F64FF861D20FEA6FAC9F89F.taxon	diagnosis	Diagnosis. Species of Gaziella with a spiny cirrus ~ 44 µm long; spines ~ 5 µm long. The clerotized cap is a spiralised plate, ~ 41 µm long.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F64FF861D20FEA6FAC9F89F.taxon	description	Description. The live animals are 2 – 2.5 mm long, slen- der, light-brown coloured due to parenchymal glands, and without eyes (Figs. 6 a and 7 a). Two types of strong frontal adenal rhabdites (Fig. 6 a: ar) are present, opening in the anterior invagination (proboscis-like structure) (Fig. 7 a: in). The pharynx (Figs. 6 a and 7 a: ph) is located at 75 %. The paired testes (Figs. 6 a and 7 a: t) are located anterolaterally from the pharynx. The thick seminal ducts run backwards and open independently into the single seminal vesicle (Figs. 6 a and 8 a – c: sv). The atrial organs are located caudal to the pharynx, in the distal body third. The copulatory bulb (Figs. 6 a and 7 a: cb) is inverted-pear shaped; it includes the seminal vesicle, the prostate vesicle (Figs. 6 a and 7 a – c: pv), a spiny cirrus (Figs. 6 a, b and 8 a – c: cir), and a distal clerotized cap (Figs. 6 a, b and 8 a – c: sc). The cirrus is 26 – 54 µm long (x = 44 µm; n = 14) and 9 – 11 µm wide (x = 10 µm; n = 14). The cirrus spines are fine, very close to each other, and 4 – 5 µm long (x = 5 µm; n = 28). The clerotized cap is a spiralised plate, 32 – 62 µm long (x = 41 µm; n = 14) and 17 – 27 µm wide proximally (x = 23 µm; n = 14). The paired vitellaria (Figs. 6 a and 7 a: vi) extend at both body sides, caudal to the brain (Fig. 6 a: br) to the level of the pharynx. The paired kidney-shaped ovaries (Fig. 6 a: ov) lie posterior to the male copulatory bulb; the oocytes are organised in a row, diminishing in diameter from the most distal to the most proximal. Each oviduct with a seminal reservoir vesicle (Fig. 6 a: sr). The bursa (Fig. 6 a: b) is located caudal to the ovaries. The common gonopore (Fig. 6 a: cg) is located at about 80 %, just caudal to the male copulatory organ.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7AFF851D20F8E6FD51FA15.taxon	description	(Figs. 6 c, d and 8 d) urn: lsid: zoobank. org: act: 838 DF 0 F 5 - D 6 AB- 4 AC 0 - A 341 - 41 ECE 429 E 8 E 5 Gaziella sp. 3 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7AFF851D20F8E6FD51FA15.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals. One whole mount, designated holotype (ZMH, No. V 13680), and one specimen used for molecular analyses collected in Siboney (type locality) (June 5, 2017); intertidal, sand rich in organic matter, upper 10 cm of sediment, salinity 32 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7AFF851D20F8E6FD51FA15.taxon	etymology	Etymology. The epithet refers to the glandular proximal two-thirds of the cirrus. Lat. Glandulae: gland.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7AFF851D20F8E6FD51FA15.taxon	diagnosis	Diagnosis. Species of Gaziella with a cirrus 94 µm long, spiny in the distal 25 % of its length; spines 5 µm long. The proximal 80 % of the cirrus is glandular. Sclerotised cap 12 µm long and 18 µm wide proximally, it covers the distal 20 % of the cirrus.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7AFF851D20F8E6FD51FA15.taxon	description	Description. The paired testes (Fig. 6 c: t) are located some distance anterolaterally from the pharynx. The thick seminal ducts run backwards and open independently into de copulatory bulb (Fig. 6 c: cb). The atrial organs are located caudal to the pharynx, in the last body third. The copulatory bulb encompasses the seminal vesicle (Figs. 6 c and 8 d: sv), the prostate vesicle (Figs. 6 c and 8 d: pv), the spiny cirrus (Figs. 6 c – c and 8 d: cir), and the clerotized cap (Figs. 6 c, d and 8 d: sc). The clerotized cap is 12 µm long and 18 µm wide proximally. It covers the spiny cirrus in the distal 20 % of its length. The cirrus is 94 µm long and 13 µm wide; its walls are glandular (6 d: cgl). The spines are distributed in the distal 23 µm of the cirrus length; they are fine and 3 – 6 µm long (x = 5 µm; n = 21). The paired vitellaria (Fig. 6 c: vi) extend along the body sides, between the brain (Fig. 6 c: br) and the pharynx. The paired oval-shaped ovaries (Figs. 6 c and 8 d: ov) lie posteriorly to the male copulatory bulb, with the oocytes in a row. Each oviduct has a seminal reservoir vesicle (Figs. 6 c and 8 d: sr). The bursa (Fig. 6 c: b) is located caudal to the ovaries, with a long bursal stalk (Fig. 8 d: bsk) and a proximal seminal reservoir vesicle (Fig. 8 d: bsr). The walls of the bursa are thick and very muscular. The common gonopore opens at 90 %, just caudal to the male copulatory organ.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F79FF831E98FA1CFB64FD2E.taxon	description	(Figs. 6 e – g, 7 b – e and 8 e – f). urn: lsid: zoobank. org: act: 49 C 98395 - 3 F 44 - 4 FB 2 - 99 C 9 - F 69 A 06 E 52947 Gaziella sp. 2 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F79FF831E98FA1CFB64FD2E.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals, whole mounted afterwards. One whole mount from Bueycabón (type locality) (February 6, 2018) designated holotype (ZMH, No. V 13681); sand with organic matter, 0.5 m deep, salinity 33 ‰. One whole mount from Guardalavaca (28 February 2017) (HU XIX. 3.29); intertidal, upper layer of fine-grained sand, salinity 35 ‰. Two whole mounts from Playa Caletón (26 January 2020) (HU XIX. 3.30 – XIX. 3.31); sublittoral, 0.5 m deep, fine-grained sand around bed of S. filiforme, salinity 37 ‰. One whole mount from Playa (27 January 2020) (HU XIX. 3.32); sublittoral, 0.7 m deep, fine-grained sand, salinity 35 ‰. Two whole mounts from Siboney (6 March 2018) (HU XIX. 3.33 – XIX. 3.34); sublittoral, 0.5 m deep, sand rich in organic matter, salinity 33 ‰. One whole mount from Juraguá (9 February 2020) (HU XIX. 3.35), sublittoral, fine-grained sand, 1.5 m deep; salinity 33 ‰. One whole mount from Hotel Guamá (21 October 2020), sublittoral, 0.8 m deep, fine-grained and silty sand, in a bed of the turtlegrass Thalassia testudinum (HU XIX. 3.36).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F79FF831E98FA1CFB64FD2E.taxon	etymology	Etymology. The epithet reflects the fact that this species has the smallest cirrus among all known species of Gaziella.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F79FF831E98FA1CFB64FD2E.taxon	diagnosis	Diagnosis. Species of Gaziella with a cirrus ~ 41 µm long, spines 3 µm long; surrounded distally by a ~ 28 - µm-long sclerotised cap.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F79FF831E98FA1CFB64FD2E.taxon	description	Description. The live animals are about 1.5 mm long, slen- der, translucent, and without eyes (Figs. 6 e and 7 b). Two types of strong frontal adenal rhabdites are present (Figs. 6 c: ar and 7 d: ar 1 and ar 2). The pharynx (Figs. 6 e and 7 b: ph) is located at 50 – 70 %. The paired testes (Figs. 6 e and 7 b: t) are located immediately anterolaterally to the pharynx. The thick seminal ducts run backwards and open independently into de copulatory bulb. The atrial organs are located caudal to the pharynx, in the second to the third body part. The copulatory bulb (Fig. 6 e) is inverted-pear shaped. It encompasses the seminal vesicle (Figs. 6 e and 7 e: sv), the prostate vesicle (Figs. 6 e and 7 e: pv), the spiny cirrus (Figs. 6 e – g, 7 e and 8 e – f: cir), and the distal sclerotised cap (Figs. 6 e – g, 7 e and 8 e – f: sc). The sclerotised cap surrounds the spiny cirrus in its distal 1 / 2 – 1 / 3 length. The cirrus is 33 – 51 µm long (x = 41 µm; n = 7) and 12 – 21 µm wide proximally (x = 17; n = 7), and the sclerotised cap is 15 – 40 µm long (x = 28 µm; n = 5) and 15 – 30 µm wide proximally (x = 24 µm; n = 7). The specimen from Guardalavaca is much squeezed (cirrus 16 µm long and 12 µm wide; stylet broken and not measurable). The cirrus spines are very fine and positioned very close to each other, about 3 µm long. The paired vitellaria (Figs. 6 e and 7 b: vi) extend at the body sides, caudal to the brain (Figs. 6 e and 7 c: br) to the distal body end. The paired oval-shaped ovaries (Fig. 6 e: ov) lie posteriorly to the male copulatory bulb, with oocytes organised in a row. Each oviduct has a seminal reservoir vesicle (Fig. 6 e: sr). The globular bursa (Fig. 6 e: b) is caudally located to the ovaries. The common gonopore (Fig. 6 e: cg) opens at 60 – 80 %. Byrsophlebidae Graff, 1905 Byrsophlebs Jensen, 1878 Byrsophlebs thalassicola sp. n. Diez, Reygel & Artois (Fig. 9) urn: lsid: zoobank. org: act: BB 6 E 81 B 4 - 7795 - 4 BCD-B 44 E- D 61 E 76 E 5 B 60 F Byrsophlebs sp. 1 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F79FF831E98FA1CFB64FD2E.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals. Five whole mounts, one of which is designated holotype (ZMH, No. V 13682) and the others paratypes (HU, No. 858 – 861), and one specimen used for molecular analyses collected in Bahía Larga (Type locality) (5 April and 25 May 2017); on leaves of Thalassia testudinum and the alga Acanthophora spicifera, 0.1 – 0.5 m deep, salinity 32 – 35 ‰. One whole mount from Chivirico (March 16, 2017) (HU XIX. 3.37); sand with organic matter, 0.1 m deep, salinity 35 ‰. Four whole mounts (HU XIX. 3.38 – XIX. 3.41) and eight serially sectioned specimens (HU XIX. 3.42 – XIX. 3.49) collected in Bueycabón (6 and 21 February 2018); on leaves of T. testudinum and Syringodium filiforme, 0.5 m deep, and intertidal on the alga Valoniopsis pachynema, salinity 33 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F79FF831E98FA1CFB64FD2E.taxon	etymology	Etymology. The epithet refers to the habitat of the species, namely leaves of Thalassia testudinum.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F79FF831E98FA1CFB64FD2E.taxon	diagnosis	Diagnosis. Species of Byrsophlebs with a prostate stylet ~ 46 µm long. Proximal third of the stylet funnel shaped, middle third tubular, tapering to a distal sharp tip. Distal tip bends over 90 °. Most external muscle layer surrounding the prostate vesicle longitudinal. Female duct bipartite, proximally differentiated into a seminal receptacle, which is separated from the distal part of the female duct by a sphincter. Bursa opens proximally into the female duct.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F79FF831E98FA1CFB64FD2E.taxon	description	Description. The live specimens are about 0.5 mm long, translucent and have a pair of eyes (Fig. 9 a, b: e). Adenal rhabdite tracts (Fig. 9 a: ar) present, with the cell bodies caudal to the eyes, their necks in between the eyes and opening terminally at the anterior end of the body. The syncytial and fully ciliated epidermis is 4 – 6 µm thick; cilia (Fig. 9 f: ci 1) 4 μm long. It includes two types of vacuoles: translucent ones and ones filled with a dark-granular secretion. The rhabdites are 2 – 4 µm long. The pharynx (Fig. 9 a, b: ph) is located at 50 %. The prepharyngeal cavity (Fig. 9 f: ppc) is lined by a nucleated epithelium and a layer of longitudinal muscles. The mouth (Fig. 9 f: m) is surrounded by a sphincter (Fig. 9 f: sph 1). Three types of glands open in the pharyngeal lumen from distal to proximal; these are as follows: coarse-grained eosinophilic (Fig. 9 f: phg 1), fine-grained eosinophilic (Fig. 9 f: phg 2), and fine-grained basophilic (Fig. 9 f: phg 3). The weak musculature of the pharynx is difficult to discern. There is a layer of longitudinal muscles just outside of the septum (Fig. 9 f: lm). Radial muscles (Fig. 9 f: rm) run between the internal and the external walls, and there are internal longitudinal muscles (Fig. 9 f: ilm). The distal lips of the pharynx are ciliated; cilia ~ 2 µm long (Fig. 9 f: ci 2). A pair of testes (Fig. 9 a, b: t) is located anterior to the pharynx, whereas the rest of the genital system is situated caudal to the pharynx. Each vas deferens forms a seminal vesicle. The seminal vesicles (Fig. 9 a: sv) fuse before entering the prostate vesicle. The prostate vesicle (Fig. 9 a, f: pv) is spindle-shaped and is surrounded by an internal oblique and an external longitudinal muscle layer. The layer of longitudinal muscles is continuous with the layer that surrounds the male atrium (Fig. 9 f: mat). The necks of the extracapsular prostatic glands (Fig. 9 f: pg) enter the prostate vesicle proximally at the same point as the ejaculatory duct does, and contain a coarse-grained eosinophilic secretion. The prostatic ducts enter the stylet proximally and can be seen over the entire length of the stylet. The stylet (Figs. 3 c – e and 9 a, b, f: st) is located just caudal to the pharynx and has an anterior orientation. However, on much squeezed specimens (Fig. 9 b), the stylet can turn towards either side or even have a posterior orientation. It is 43 – 52 µm long (x = 46 µm; n = 8) and 13 – 19 µm wide proximally (x = 15 µm; n = 6). The proximal third of the stylet is funnel-shaped; the mid-third is tubular and tapers to a distal sharp tip, which is bent over 90 °. The male atrium is globular, lined by a nucleated epithelium and a layer of longitudinal muscles. The male gonopore (Fig. 9 f: mg) is surrounded by a sphincter (Fig. 9 f: sph 2) and opens at 60 %. The paired vitellaria (Fig. 9 a and f: vi) lie laterally, between the brain and the caudal body end. The vitelloducts open into the most proximal part of the oviduct, which shows a sphincter just distally to the entrance of the vitelloducts (Fig. 9 f: sph 4). The long-drawn ovary (Fig. 9 a, f: ov) is located dorsally, with the oocytes organised in a row, diminishing in diameter from the most distal one to the most proximal one. The female duct (Fig. 9 a, b, f: fd) is bipartite, proximally forming a seminal receptacle (Fig. 9 f: sr; terminology of Karling, 1985). The female duct is lined by a high nucleated epithelium and an external layer of longitudinal muscles which is continuous with the longitudinal layer surrounding the bursa. The seminal receptacle is distally delimited by a weak sphincter (Fig. 9 f: sph 6). A bundle of female glands (Fig. 9 f: fg) enters caudally the most distal part of the female duct, and contains a fine-grained, eosinophilic secretion. The bursa (Fig. 9 f: b) enters the female duct at the level of the seminal receptacle, contains a very fine secretion, and is lined by a syncytial epithelium; a sphincter (Fig. 9 f: sph 5) surrounds this connection. The female gonopore (Fig. 9 f: fg) opens at 90 % and is surrounded by a sphincter (Fig. 9 f: sph 3).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	description	urn: lsid: zoobank. org: act: 62 C 1 E 916 - AE 14 - 4571 - AFD 1 - 443 E 047266 C 3 Brinkmanniella sp. 1 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	materials_examined	Material and distribution. Cuba: Observations on one live animal, whole mounted afterwards, designated holotype (ZMH, No. V 13683), collected in Bueycabón (type locality) (25 May 2018); on the alga Digenea simplex, 0.5 m deep, salinity 32 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	etymology	Etymology. Species named after the simple morphology of its stylet. Lat. simplex: simple.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	diagnosis	Diagnosis. Species of Brinkmanniella with a funnel-shaped 60 - µm-long stylet, which is 29 µm wide proximally and 3 µm wide distally.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	description	Description. The live animal is about 0.6 mm long, unpigmented, with a pair of eyes (Fig. 10 a: e). The pharynx (Fig. 10 a: ph) has a diameter of about 30 % of the body length of the live specimen and is located caudally. The testes (Fig. 10 a: t) are located in the second body half, caudal to the ovaries. The vasa deferentia open separately into the copulatory bulb, where they join and form the single seminal vesicle (Fig. 10 a: sv). The copulatory bulb is located beside the pharynx and apart from the large and rounded seminal vesicle. It also encloses the prostate vesicle which is connected to the stylet. The funnel-shaped stylet (Fig. 10 a: st, b, e) is 60 µm long, 29 µm wide proximally, and 3 µm wide distally. The ovaries (Fig. 10 a: ov) are located anterior to the testes in the anterior half of the body. Brinkmanniella tenebrosa sp. n. Diez, Reygel & Artois (Fig. 10 c, d, f) urn: lsid: zoobank. org: act: 4 D 693 C 04 - 8 A 69 - 4 B 99 - A 7 E 2 - 5 D 05 FCB 82 F 70 Brinkmanniella sp. 2 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals. Four whole mounts from Bueycabón (type locality) (6 February 2018), one of which is designated holotype (ZMH, No. V 13684) and the others paratypes (HU, No. 862 – 864), and one specimen used for molecular analyses; on leaves of T. testudinum and the alga Galaxaura rugosa, 0.5 m deep, salinity 33 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	etymology	Etymology. The epithet refers to the dark pigmentation of the animal. Lat. tenebrosus: dark.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	diagnosis	Diagnosis. Species of Brinkmanniella darkly pigmented, with a ~ 59 - µm-long tubular stylet, which is ~ 17 µm wide proximally and ~ 7 µm wide distally.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	description	Description. The live specimens are about 0.8 mm long, darkly pigmented, with a pair of eyes (Fig. 10 c: e). Adenal rhabdite tracts present, with the cell bodies caudal to the eyes, their necks in between the eyes and opening terminally at the anterior end of the body. The pharynx (Fig. 10 c: ph) is located at 75 %. It has a diameter of 20 % of the body length in the live animals. Organisation of the genital and atrial organs as in B. simplex sp. n. The funnel-shaped stylet (Fig. 10 d, f) is 55 – 63 µm long (x = 59 µm; n = 3), 16 – 18 µm wide proximally (x = 17 µm; n = 3), and 6 – 9 µm wide distally (x = 7 µm; n = 3). The globular ovaries (Fig. 10 c: ov) are located just caudal to the eyes and lie in the anterior body half. Promesostomidae Luther, 1948 Kymocarens Ehlers & Ehlers, 1981 Kymocarens morrisi sp. n. Diez, Reygel & Artois (Fig. 11) urn: lsid: zoobank. org: act: 78 F 39 A 2 A- 509 D- 4 DC 5 - 9569 - 990 DD 14830 FE Kymocarens sp. in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals, whole mounted afterwards. Seven whole mounts, one of which is designated holotype (ZMH, No. V 13685) and the others paratypes (HU, No. 865 – 870), and eight serially sectioned specimens (UH XIX. 3.50, XIX. 4.01 – XIX. 4.07) collected in Aguadores (Type locality) (24 January 2017); intertidal, upper 20 cm of medium-grained sand, salinity 35 ‰. One whole mount from Belmares, Bahía de Santiago de Cuba (January 31, 2017) (UH XIX. 4.08); intertidal, upper 10 cm of coarse shell gravel, salinity 35 ‰. One whole mount from Juraguá (February 9, 2020) (UH XIX. 4.09); intertidal, upper 20 cm of medium-coarse sand, salinity 33 ‰. One whole mount from Chivirico, near Hotel Guamá, Guamá (October 21, 2020) (UH XIX. 4.10); sublittoral, 0.8 m deep, fine-grained and silty sand, surrounded by the turtlegrass Thalassia testudinum, salinity 33 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	etymology	Etymology. Species dedicated to Prof. Dr Humberto Joaquín Morris Quevedo (Universidad de Oriente, Santiago de Cuba, Cuba), nutraceutical specialist and dear friend of the first author.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	diagnosis	Diagnosis. Species of Kymocarens with a pair of eyes. Tubular stylet ~ 81 µm long, with a longitudinal slit in its proximal end and a 90 ° bend at its mid-length. Internal bursal vesicle surrounded by a parenchymal sheath.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7FFF801D20FD30FB44FC82.taxon	description	Description. The live animals are 0.5 – 0.7 mm long, translucent, with a pair of eyes (Fig. 11 a: e). Adenal rhabdite tracts present (Fig. 11 a: ar), with the cell bodies caudal to the eyes, their necks in between the eyes and opening terminally at the anterior tip of the body. These rhabdites are 5 – 12 µm long (x = 7 µm; n = 11), measured on sections. The syncytial and fully ciliated epidermis is 6 – 9 µm thick dorsally, with rhabdites 5 – 7 µm long (x = 6 µm; n = 15). Ventrally, the epidermis is 2 – 3 µm thick, containing few ~ 2 µm-long rhabdites. The cilia are 3 – 4 µm long. Two types of vacuoles are present in the epidermis: some translucent and some filled with a granular secretion. The caudal body end is differentiated into a tail plate (Fig. 11 a: tp), with conspicuous adhesive glands. The pharynx (Fig. 11 a: ph, b) is situated at 50 %. At least four types of glands open into the pharyngeal lumen. These glands are, from distal to proximal, coarse-grained eosinophilic (stained reddish) (Fig. 11 b: phg 1), coarse-grained basophilic (stained dark blue-black) (Fig. 11 b: phg 2), and two fine-grained eosinophilic ones (stained brownish and yellowish, respectively) (Fig. 11 b: phg 3 and phg 4). The musculature of the pharynx consists of a layer of longitudinal muscles just outside of the septum (Fig. 11 b: lm 1) and continuous with the longitudinal muscles of the prepharyngeal cavity. Apart from the radial muscles, we did not observe any other musculature inside the pharynx septum. Radial muscles run between the internal and external walls of the pharynx (Fig. 11 b: rm). The pharynx lumen is surrounded by a thin, anucleated epithelium (Fig. 11 b: ep), a longitudinal (Fig. 11 b: lm 2), and circular muscle layer (Fig. 11 b: cm). The distal lips of the pharynx are ciliated (Fig. 11 b: ci); cilia 2 µm long. The distal opening of the pharynx lumen is surrounded by a sphincter (Fig. 11 b: sph 2). The prepharyngeal cavity (Fig. 11 b: ppc) is lined with a thin, anucleated epithelium and an external layer of longitudinal muscles. A layer of denser parenchyma (Fig. 11 b: pa) surrounds the prepharyngeal cavity outside of the longitudinal muscle layer. The mouth (Fig. 11 b: m) is surrounded by a sphincter (Fig. 11 b: sph 1). The testes (Fig. 11 a: t) are located ventrally, rostrolaterally from the pharynx. The vasa deferentia form the seminal vesicles (Fig. 11 a, c: sv) caudal to the pharynx. The seminal vesicles fuse just before entering the copulatory bulb. They are lined by a nucleated epithelium. The prostate vesicle (Fig. 11 a, c: pv) is globular and contains medium-grained, eosinophilic secretion. We did not observe a muscle layer surrounding the prostate vesicle. The tubular stylet (Fig. 11 a, c: st, d – e) is 66 – 89 µm long (x = 81 µm; n = 9) and 8 – 15 µm wide proximally (x = 12 µm; n = 9). A longitudinal slit is present in its proximal end and the stylet is curved over 90 ° at its midpoint. The male atrium is lined by a nucleated epithelium and a layer of longitudinal muscles. It enters the common genital atrium anteriorly (Fig. 11 c: ca). The paired vitellaria (Fig. 11 a, c: vi) extend dorsally along both sides of the body, from the eyes to the caudal body end. The ovaries (Fig. 11 a, c: ov) are situated caudally in the ovovitellaria. They are oval shaped, with the oocytes organised in a row. Each oviduct proximally forms a seminal receptacle (Fig. 11 c: sr), proximally of which a bundle of fine-grained, eosinophilic glands enter the oviduct (Fig. 11 c: eg 2). Both oviducts then unite to form the female duct, which receives two types of female glands: fine-grained, eosinophilic ones proximally (Fig. 11 c: eg 1) and coarse-grained, basophilic ones distally (Fig. 11 c: bg). The oviducts and female duct are lined with a nucleated epithelium; muscles were not observed. The female duct enters the common genital atrium caudally. The bursa (Fig. 11 a, c: b) is connected to the common genital atrium through its dorsal wall. This bursa is filled with sperm and a fine-grained, eosinophilic secretion. It is lined by a high, nucleated epithelium (~ 5 µm thick) and a circular muscle layer. The bursa is lined by longitudinal muscles in its distal half and a layer of dense parenchyma more proximally (~ 4 µm thick) (Fig. 11 c: pa). The common genital atrium is lined by a nucleated epithelium and a layer of longitudinal muscles. The common gonopore (Fig. 11 c: cg) is situated at 70 % and surrounded by a sphincter (Fig. 11 c: sph).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7CFF8E1D20FCE9FE7CF8DE.taxon	description	urn: lsid: zoobank. org: act: 4 FF 78 E 7 F-DCF 0 - 40 D 8 - 8763 - F 73 C 7 C 15 A 93 E Promesostoma sp. 2 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7CFF8E1D20FCE9FE7CF8DE.taxon	materials_examined	Material and distribution. Cuba: Observations on one live animal, whole mounted afterwards, designated holotype (ZMH, No. V 13686), collected in Bueycabón (type locality) (February 21, 2018); sublittoral, on the alga Gelidiella acerosa, 0.5 m deep, salinity 33 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7CFF8E1D20FCE9FE7CF8DE.taxon	etymology	Etymology. Species named after the walking-stick-shaped stylet. Lat. Baculum: walking stick.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7CFF8E1D20FCE9FE7CF8DE.taxon	diagnosis	Diagnosis. Species of Promesostoma with eyes. Copulatory bursa present. Seminal vesicle, prostate vesicle and male atrium with stylet located latero-caudal to the pharynx. Slightly curved stylet 93 µm long, with the proximal funnel bent over about 90 °. Tubular part of the stylet 2 – 3 µm wide, ending in a widened (5 µm) and oblique distal tip. Seminal vesicle oriented forward, surrounded by a strong sphincter at the connection to the prostate vesicle.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7CFF8E1D20FCE9FE7CF8DE.taxon	description	Description. The overall organisation is comparable to that of other species of Promesostoma (see Luther, 1943; Ax, 1951, 1952; Karling, 1967). The live animal is about 1 mm long, translucent, with two eyes (Fig. 12 a: e). Anterior adenal rhabdite tracts present (Fig. 12 a: ar). The pharynx (Fig. 12 a: ph) is located at 50 %. The testes (Fig. 12 a: t) are located anterior to the pharynx. The vasa deferentia fuse and form a single seminal vesicle. The seminal vesicle, the prostate vesicle and the stylet are located latero-caudal to the pharynx. On the whole mount it was impossible to infer whether or not the seminal vesicle is surrounded by a muscle layer. The seminal vesicle (Fig. 12 a, b: sv) is oriented forwards and opens into the prostate vesicle, running axially through it (Fig. 12 a, b: pv). A sphincter (Fig. 12 b: sph 1) surrounds the connection between the seminal and the prostate vesicle. The slightly curved stylet (Figs. 12 a, b and 15 a: st 12 c) is 93 µm long, with the proximal funnel bent over ~ 90 ° relative to the tubular part. The funnel is 9 µm long, 6 µm wide proximally, and 3 µm wide distally. The base of the funnel is surrounded by a sphincter (Fig. 12 b: sph 2). The tubular part of the stylet is 2 – 3 µm wide and ends in a widened (5 µm), oblique tip. At the location where the stylet bends, the male atrium (Fig. 12 b: cb) receives the male copulatory bursa (Fig. 12 a, b: mb; terminology of Karling, 1967). The paired vitellaria (Fig. 12 a: vi) extend laterally, from the eyes to the caudal body end. The globular ovaries (Fig. 12 a: ov) are located caudal to the pharynx. Promesostoma cubanum sp. n. Diez, Reygel & Artois (Figs. 12 d – f and 15 b) urn: lsid: zoobank. org: act: 121 E 1264 - 4 D 1 A- 4 DA 5 - B 4 BA- EFD 5321 BDCD 0 Promesostoma sp. 1 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7CFF8E1D20FCE9FE7CF8DE.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals, whole mounted afterwards. Three whole mounts from Bueycabón (type locality) (6 February and 25 May 2018), one of which is designated holotype (ZMH, No. V 13687) and the others paratypes (HU, No. 871 – 872), and one specimen used for molecular analyses; on leaves of T. testudinum and S. filiforme and the alga G. rugosa, 0.5 m deep, salinity 32 ‰. Two whole mounts from Sardinero (March 18, 2021), sublittoral, 0.5 m deep, on leaves of the turtlegrass Thalassia testudinum, salinity 32 ‰ (HU XIX. 4.11 – XIX. 4.12).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7CFF8E1D20FCE9FE7CF8DE.taxon	etymology	Etymology. Species named after the island of Cuba.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7CFF8E1D20FCE9FE7CF8DE.taxon	diagnosis	Diagnosis. Species of Promesostoma with eyes. Copulatory bursa lacking. Seminal vesicles, prostate vesicle, and male atrium with stylet located caudal to the pharynx. Slightly curved stylet ~ 106 µm long, with a circular extension surrounding the stylet proximally and ending in a slightly swollen, rounded tip. A bipartite structure runs adjacent to the male atrium; consisting of a pronounced muscular part and a smaller, sperm-containing vesicle devoid of musculature.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F7CFF8E1D20FCE9FE7CF8DE.taxon	description	Description. The overall organisation is comparable to that of other species of Promesostoma (see Luther, 1943; Ax, 1951, 1952; Karling, 1967). Measured on the whole mounts, animals are 0.5 – 1 mm long (x = 0.7 mm; n = 3), translucent, with a pair of kidney-shaped eyes (Fig. 12 d: e). Anterior adenal rhabdite tracts present (Fig. 12 d: ar), with the cell bodies caudal to the eyes, their necks in between the eyes and opening terminally at the anterior end of the body. The pharynx (Fig. 12 d: ph) is located at 50 %, with a diameter of 68 – 114 µm (x = 94 µm; n = 3), measured on the whole mounts. The testes (Fig. 12 d: t) are located anterior to the pharynx. The seminal vesicles, the prostate vesicle, and the male duct (Fig. 12 e: md) are located caudal to the pharynx. The seminal vesicles (Figs. 12 d – e and 15 b: sv) are oriented backward and fuse just before entering the prostate vesicle (Figs. 12 d – e and 15 b: pv), forming a seminal duct that runs axially through the prostate vesicle. It is not clear from the available material whether or not the seminal vesicles are surrounded by a muscle layer. The slightly curved stylet (Figs. 12 d – e and 15 b: st, 12 f) is 93 – 103 µm long (x = 106 µm; n = 5). Its proximal funnel is 7 – 10 µm long (x = 9 µm; n = 5), 11 – 18 µm wide proximally (x = 17 µm; n = 5), and 4 – 6 µm wide distally (x = 5 µm; n = 5). Its proximal rim is slightly folded backwards. Somewhat distally to the funnel, a circular extension surrounds the stylet. Distally to this extension, the stylet is tubular, 7 – 8 µm wide proximally (x = 7 µm, n = 5), 5 – 6 µm wide medially (x = 5 µm; n = 5), and 6 – 8 µm wide distally (x = 7 µm; n = 5). The distal tip of the stylet is a bit wider, with the opening exactly terminal. A very muscular and cylindrical structure (Figs. 12 d – e and 15 b: x) runs adjacent to the copulatory bulb. From the whole mounts, it is impossible to discern whether this structure is part of the male or the female system. Proximally, this structure continues in a non-muscular receptacle containing sperm (Fig. 12 e: sr). The paired vitellaria (Fig. 12 d: vi) extend along both sides of the body, from the eyes to the caudal body end. The oval ovaries (Fig. 12 d: ov) are located caudal to the copulatory bulb.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F72FF8D1D20FF40FEC0FE0D.taxon	description	urn: lsid: zoobank. org: act: EF 102 DE 1 - EB 7 D- 42 A 9 - 95 F 7 - 99 C 083 E 04918	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F72FF8D1D20FF40FEC0FE0D.taxon	materials_examined	Material and distribution. Panama: Five specimen studied alive and whole mounted, one of which is designated holotype (ZMH, No. V 13688) and the others paratypes (HU, No. 873 – 876), collected in Bahía Can Can (type locality), near to Portobelo, Atlantic side of Panama (29 February 2016). Two specimens, including the holotype, collected subtidally in a lagoon, in fine-grained sand with some organic matter taken in between sea grass, 0.2 m deep at low tide; the other three specimens collected intertidally, in well-sorted and fine sand from channels in mangroves.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F72FF8D1D20FF40FEC0FE0D.taxon	etymology	Etymology. Species named after the fact that the stylet shows an elbow-like proximal extension. Lat. Cubitum: elbow.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F72FF8D1D20FF40FEC0FE0D.taxon	diagnosis	Diagnosis. Species of Promesostoma with eyes. Copulatory bursa present. Seminal vesicle, prostate vesicle, and male atrium with stylet located caudal to the pharynx. Slightly curved stylet ~ 118 µm long, with a pointed elbow-shaped, angular projection just distally to the proximal funnel-shaped part.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F72FF8D1D20FF40FEC0FE0D.taxon	description	Description. The overall organisation is comparable to that of other species of the genus Promesostoma (see Luther, 1943; Ax, 1951, 1952; Karling, 1967). Measured on the whole mounts, the animals are 1 – 1.1 mm long (n = 2), translucent, with a pair of eyes (Fig. 13 a: e). Anterior adenal rhabdite tracts are present (Fig. 13 a: ar). The pharynx is located at 50 % (Fig. 13 a: ph); it is 117 – 182 µm in diameter (x = 152 µm; n = 3) measured on the whole mounts. A pair of testes (Fig. 13 a: t) is located anterior to the pharynx. The seminal vesicle, the prostate vesicle, and stylet are located caudal to the pharynx. The vasa deferentia run caudal and fuse to form a single seminal vesicle (Figs. 13 a and 15 c: sv), which narrows distally to enter the prostate vesicle (Figs. 13 a and 15 c: pv) and runs axially through it. On the whole mounts it was impossible to assess whether or not the seminal vesicle is surrounded by a muscle layer. The prostate vesicle itself connects to the stylet. The male atrium receives the well-developed male copulatory bursa and the stylet. The stylet (Figs. 13 a and 15 c: st, 13 b) is 108 – 123 µm long (x = 118 µm; n = 5). Proximally it is funnel shaped, 8 – 10 µm wide (x = 9 µm; n = 5). Caudal to the funnel, the stylet shows a pointed angular projection, which is somewhat elbow shaped. The distal end of the stylet is widened, with the distal opening of the stylet completely at the end. The male copulatory bursa (Figs. 13 a and 15 c: mb; terminology of Karling, 1967) is located beside the pharynx and opens into the male atrium at the level of the projection of the stylet. The paired vitellaria (Fig. 13 a: vi) extend along both body sides, from the eyes to the caudally located, oval-shaped ovaries (Fig. 13 a: ov). Fig. 13 a, b Promesostoma cubitum sp. n. c – d, Promesostoma panamensis sp. n. a, c Body organisation. b, e Stylet (from the holotype). d Schematic reconstruction of the male genital structures. Structures oriented with the anterior end toward the top of the plate	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F71FF8A1E98FA74FE5FFCA0.taxon	description	urn: lsid: zoobank. org: act: 56 E 29 EE 6 - 46 C 3 - 4 A 04 - 9 B 27 - A 96 E 1478 CD 86	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F71FF8A1E98FA74FE5FFCA0.taxon	materials_examined	Material and distribution. Panama: Observations on live animals, whole mounted afterwards. Seven whole mounts, one of which is designated holotype (ZMH, No. V 13689) and the others paratypes (HU, No. V 877 – 882), collected in Taboga (type locality), Taboga Island, Pacific side of Panama (9 December 2011); intertidal, fine sand with the alga Caulerpa sp., salinity 30 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F71FF8A1E98FA74FE5FFCA0.taxon	etymology	Etymology. Species named after its occurrence in Panama.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F71FF8A1E98FA74FE5FFCA0.taxon	diagnosis	Diagnosis. Species of Promesostoma with eyes. Copulatory bursa present. Prostate vesicle located anterior to the pharynx, the seminal vesicle located beside the pharynx, and the male atrium with stylet caudal to the pharynx. Stylet ~ 88 µm long and twisting 360 ° at about its proximal third; distal end rounded to oblique. Seminal vesicle oriented forward and prostate vesicle backward.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F71FF8A1E98FA74FE5FFCA0.taxon	description	Description. The overall organisation is comparable to that of other species of the genus Promesostoma (see Luther, 1943; Ax, 1951, 1952; Karling, 1967). Measured on the whole mounts, the animals are 0.5 – 1.1 mm long (x = 0.8 mm; n = 4) translucent, with a pair of eyes (Fig. 13 c: e). Anterior rhabdite tracts present (Fig. 13 a: ar). The pharynx (Figs. 13 c, d and 15 d: ph) is located at 50 – 60 %, and in the whole mounts is 82 – 102 µm in diameter (x = 94 µm; n = 3). A pair of testes (Fig. 13 c: t) is located anterior to the pharynx. The vasa deferentia open into a single seminal vesicle (Figs. 13 c, d and 15 d: sv), which is located beside the pharynx. Whether or not the seminal vesicle is surrounded by a muscle layer is unclear from the whole mounted material. From this vesicle, the seminal duct runs forward and opens into the prostate vesicle, which is located anterior to the pharynx. The prostate vesicle (Figs. 13 c, d and 15 d: pv) connects to the stylet through a relatively long duct. The stylet (Figs. 13 c, d and 15 d: st, 13 e) is positioned caudal to the pharynx. It is 81 – 92 µm long (x = 88 µm; n = 7), with a proximal, funnel-shaped part 2 – 3 µm wide (x = 2 µm; n = 7), surrounded by a sphincter (Fig. 13 d: sph). At about its proximal third the stylet makes a 360 ° turn. Its distal end is blunt, its opening sometimes appearing a bit oblique. The male copulatory bursa (Figs. 13 c, d and 15 d: mb; terminology of Karling, 1967) is located latero-proximally from the stylet, entering the male atrium at the level of the turn of the stylet. The paired vitellaria (Fig. 13 c: vi) extend laterally, between the brain and the caudal body end. The oval-shaped ovaries (Fig. 13 c: ov) are located latero-caudal to the male atrium. A glandular structure (Fig. 13 c: x), presumably part of the female system, is located between the ovaries. The common gonopore (Fig. 13 c: cg) opens at 80 %. Promesostoma roseapharynx sp. n. Diez, Reygel & Artois (Figs. 14 a – c and 15 e) urn: lsid: zoobank. org: act: 53511906 - ED 97 - 4332 - 924 F- 1 AF 9 FB 99 C 04 D Promesostoma sp. 3 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F71FF8A1E98FA74FE5FFCA0.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals. Three whole mounts from Las Sardinas (type locality) (21 June 2017), one of which is designated holotype (ZMH, No. V 13690) and the others paratypes (HU, No. 883 – 884); on the alga Dictyota menstrualis covered with silty sand, 0.5 m deep, salinity 32 ‰. Two whole mounts and one specimen used for molecular analyses from Chivirico (March 16, 2017) (HU XIX. 4.13 – XIX. 4.14); on the alga Halimeda sp. covered with silt, 0.6 m deep, salinity 35 ‰. Seven whole mounts from Bueycabón (February 6 & 21, & May 25, 2018) (HU XIX. 4.15 – XIX. 4.21); on algae (V. pachynema covered with red filamentous algae, Amphiroa fragilissima, G. rugosa, and G. acerosa), 0.5 m deep, salinity 32 ‰. Etymology. Species named after the pinkish glands of the pharynx observed on live animals. Lat. roseus: pink.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F71FF8A1E98FA74FE5FFCA0.taxon	diagnosis	Diagnosis. Species of Promesostoma with eyes. Male copulatory bursa present. Curved stylet situated beside the pharynx, ~ 177 µm long, with the proximal funnel bent over ~ 180 °. Tubular part of the stylet ~ 2 µm wide and ends in a sharp and oblique tip. Seminal vesicle situated caudally and laterally from the pharynx, oriented forward. Prostate vesicle anterior to the pharynx, directed backwards.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F71FF8A1E98FA74FE5FFCA0.taxon	description	Description. The overall organisation is comparable to that of other species of the genus Promesostoma (see Luther, 1943; Ax, 1951, 1952; Karling, 1967). Measured on the whole mounts, the animals are 0.6 – 1 mm long (x = 0.8 mm; n = 3), translucent, with a pair of eyes (Fig. 14 d: e). Adenal rhabdite tracts present anteriorly (Fig. 14 a: ar). The pharynx (Figs. 14 a and 15 e: ph) is located at 50 %, 105 – 136 µm in diameter (x = 119 µm; n = 4), measured on the whole mounts, containing pinkish glands in live animals. A pair of testes (Fig. 14 a: t) is located anterior to the pharynx. The vasa deferentia open into a large seminal vesicle situated caudal to the pharynx. On the whole mounts it was not possible to infer whether or not the seminal vesicle is surrounded by a muscle layer. The seminal vesicle (Fig. 14 a, b: sv) is oriented forwards and opens into the prostate vesicle (Figs. 14 a, b: pv), which itself is located anterior to the pharynx and oriented backwards. The male duct (Fig. 14 b: md) receives the stylet and the male copulatory bursa (Figs. 14 a, b: mb; terminology of Karling, 1967). The curved stylet (Figs. 14 a, b and 15 e: st, 14 c) lies next to the pharynx. It is 168 – 189 µm long (x = 177 µm; n = 12), with a proximal funnel bent over ~ 180 °. This funnel is 9 – 15 µm long (x = 12 µm; n = 7) and 6 – 8 µm wide proximally (x = 7 µm; n = 7). A sphincter surrounds the base of the funnel. The tubular part of the stylet is 2 – 3 µm wide (x = 2 µm; n = 12), and distally ends in a sharp, oblique tip. The proximal half of the stylet is surrounded by a sheath of circular muscles. The paired vitellaria (Fig. 14 a: vi) extend laterally from the eyes to the caudal body end. The oval-shaped ovaries (Fig. 14 a: ov) are located caudal to the pharynx. The common gonopore opens at 70 – 75 %.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F76FF881E98FC8FFD49FF58.taxon	description	(Figs. 14 d, e and 15 f) urn: lsid: zoobank. org: act: 8 EB 37 E 6 D- 8 BBD- 40 D 8 - 9 C 37 - 12 A 1 C 1119108	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F76FF881E98FC8FFD49FF58.taxon	materials_examined	Material and distribution. Panama: One specimen studied alive and whole mounted, designated holotype (ZMH, No. V 13691), collected in Las Perlas (type locality), Archipelago Las Perlas, Pacific side of Panama (December 6, 2011); coarse sand with shell gravel and sponge spicules, 20 m deep, salinity 30 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F76FF881E98FC8FFD49FF58.taxon	etymology	Etymology. The name refers to the fact that one of the distal parts of the stylet is spoon shaped. Gr.: spoon.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F76FF881E98FC8FFD49FF58.taxon	diagnosis	Diagnosis. Species of Promesostoma without eyes. Copulatory bursa present. Seminal vesicle and prostate vesicle located beside the pharynx; male atrium with stylet caudal to the pharynx. Seminal vesicle and prostate vesicle open separately into the copulatory bulb. Stylet 109 µm long, distally split into two branches. Larger branch distally widened (16 µm wide) and spoon shaped, with a very broad distal aperture. Second branch 52 µm long and 7 µm wide.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F76FF881E98FC8FFD49FF58.taxon	description	Description. The overall organisation is comparable to that of other species of the genus Promesostoma (see Luther, 1943; Ax, 1951, 1952; Karling, 1967). The live animal is about 1 mm long, translucent, without eyes. Adenal rhabdite tracts present anteriorly. The pharynx (Fig. 14 d: ph) is 74 µm in diameter in the whole mount, located at 50 %. The testes are located anterior to the pharynx. The vasa deferentia open into a single seminal vesicle (Fig. 14 d: sv), located beside the pharynx. It was not clear from the whole mounted specimen whether or not the seminal vesicle is surrounded by a muscle layer. The prostate vesicle (Fig. 14 d: pv) is located beside the pharynx and next to the seminal vesicle. Both the seminal vesicle and prostate vesicle open separately into the male atrium. The male atrium also receives the male copulatory bursa (Fig. 14 d: mb; terminology of Karling, 1967). The stylet (Figs. 14 d and 15 f: st, 14 e) is 109 µm long and distally split in two branches. The larger branch (Figs. 14 e and 15 f: p 1) is distally widened (16 µm wide) and spoon shaped, with a very broad distal aperture. The second blanch (Figs. 14 e and 15 f: p 2) is 52 µm long and 7 µm wide. The paired vitellaria (Fig. 14 d: vi) extend laterally, from the brain to the caudal body end. The globular to kidney-shaped ovaries (Fig. 14 d: ov) are located beside the stylet. Trigonostomidae Graff, 1905 Ceratopera Hartog, 1964 Ceratopera paragracilis Ehlers & Ax, 1974 (Fig. 16) Ceratopera sp. in Diez et al. (2023) Known distribution. Isabela, Archipelago Colon, Galapagos Islands (Ehlers & Ax, 1974). St. George’s West, Biological Station landing, Bermuda Islands, Bermuda (Karling, 1978). Material and distribution. Cuba: Observations on live animals. Two whole mounts from Bahía Larga (April 5, 2017) (HU XIX. 4.22 – XIX. 4.23); on leaves of the seagrass T. testudinum, 1 m deep, salinity 34 ‰. One whole mount from Bueycabón (21 February 2018) (HU XIX. 4.24), on leaves of T. testudinum and S. filiforme, 0.5 m deep, salinity 33 ‰. One specimen used for molecular analyses collected in Sardinero (18 March 2021); sublittoral, on leaves of T. testudinum, 0.6 m deep, salinity 34 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F76FF881E98FC8FFD49FF58.taxon	discussion	Remarks. The habitus and overall internal organisation of the specimens from Cuba correspond to the description of Ehlers and Ax (1974). Specimens are about 1 mm long, unpigmented and have a pair of eyes (Fig. 16 a: e). Large adenal rhabdite tracts are present anteriorly (Fig. 16 a: ar), with the cell bodies caudal to the eyes, their necks in between the eyes and opening terminally at the anterior end of the body. The stylet (Fig. 16 c, g: st, 16 d) is 44 – 58 µm long (x = 51 µm; n = 3), and 3 – 4 µm wide in the middle (x = 4 µm; n = 3). The mantle (Fig. 16 c, g: ma, 16 e) is 53 µm long (n = 3). The bursal appendage (Fig. 16 a: ba; b; f) is 60 – 64 µm long in the specimens from Bahía Larga (x = 62 µm; n = 2) and 105 µm long in the specimen from Bueycabón, 14 – 16 µm wide medially (x = 15 µm; n = 3), and 5 µm wide in the distal tubular part (n = 2). In the specimen from Bueycabón, two distal tubes were observed, which are 31 µm long and 2 µm wide.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F74FF881D20FE5BFB96FC44.taxon	description	(Fig. 18) Trigonostomum sp. 2 in Diez et al. (2023) Known distribution. Curaçao (Dutch Antilles), Florida (USA), Mombasa (Kenya), Zanzibar (Tanzania), Nouméa (New Caledonia) (Willems et al., 2004 b).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F74FF881D20FE5BFB96FC44.taxon	materials_examined	Material and distribution. Cuba: Observations on one live animal, whole mounted afterwards (HU XIX. 4.36), collected in Bahía Larga (April 5, 2017); on leaves of T. testudinum, 1 m deep, salinity 34 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F74FF881D20FE5BFB96FC44.taxon	discussion	Remarks. The general habitus of the specimen collected in Cuba fits the description provided by Willems et al. (2004 b). The stylet (Fig. 18 a: st, 18 b, d) is 103 µm long, and the bursal appendage (Fig. 18 a: ba; c, e) is 97 µm long. The dimensions of stylet and bursal appendage are within the range recorded in literature: 86 – 111 µm long and 62 – 166 µm long, respectively (Willems et al., 2004 b).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F74FF881E98FF26FAB5FED3.taxon	description	Known distribution. Norway (Graff, 1882; Jensen, 1878; Westblad, 1954; Willems et al., 2004 b), English Channel (Gamble, 1893), North Sea (Attems, 1897; Meixner, 1924, 1925), Ireland (Gamble, 1893, 1900; Southern, 1912, 1915, 1936), Faeroe Islands (Steinböck, 1931), Iceland (Steinböck, 1938), Baltic Sea (Ax, 1952). United Kingdom, Sweden, Wimeroux (France), Curaçao, New South Wales, Arrawarra (Australia), Nouméa (New Caledonia), and South Georgia (Willems et al., 2004 b).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F74FF881E98FF26FAB5FED3.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals. Nine whole mounts and one specimen for molecular analyses from Siboney (22 March and 5 June 2017) (HU XIX. 4.25 – XIX. 4.33); sublittoral, on algae (Ulva lactuca, U. flexuosa, and Gracilaria sp.), 0.5 m deep, salinity 32 – 35 ‰. One whole mount from Bueycabón (6 February 2018) (XIX. 4.34), sublittoral, 0.5 m deep, on the red alga Galaxaura rugosa, salinity 33 ‰. One whole mount from Playa Caletón (24 January 2020) (XIX. 4.35), sublittoral, 0.5 m deep, on leaves of the seagrass Syringodium filiforme, salinity 37 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F74FF881E98FF26FAB5FED3.taxon	discussion	Remarks. For a detailed treatment of this species, see Willems et al. (2004 b) and references therein. The live specimens collected in Cuba are about 0.8 – 1 mm long. The body is translucent, with anterior spots consisting of dark pigment granules. Each eye (Fig. 17 a: e) is observed as two pigmented spots due to squeezing. The stylet (Fig. 17 a, b: st, 17 c) is 333 – 369 µm long (x = 352 µm; n = 8). The bursal appendage (Fig. 17 a, b: ba) is 84 – 100 µm long (x = 89 µm; n = 6). The bursal channel is sclerotised (Fig. 17 a, b: sbc).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F74FFB71D20FC22FDA2F985.taxon	description	(Fig. 19) Trigonostomum sp. 3 in Diez et al. (2023) Known distribution. Venice, Italy (Artois et al., 2013).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F74FFB71D20FC22FDA2F985.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals. Five whole mounts and one specimen for molecular analyses from Bahía Larga (May 25, 2017) (HU XIX. 4.37 – XIX. 4.41); on leaves of T. testudinum, 0.5 m deep, salinity 32 ‰. Six whole mounts from Bueycabón (25 May 2018 and 20 May 2021) (HU XIX. 4.42 – XIX. 4.47); on leaves of T. testudinum and S. filiforme, 0.5 m deep, salinity 32 ‰. Remarks. The stylet proper (Fig. 19 a, c: st, 19 f) is 48 – 54 µm long (x = 52 µm; n = 4), 10 – 17 µm wide proximally (x = 15 µm; n = 4), and 3 µm wide at its midpoint (n = 5). The broader plate (Fig. 19 c: pl 1, 19 d) of the mantle is 31 – 36 µm long (x = 33 µm; n = 3) and 12 – 19 µm wide proximally (x = 15 µm; n = 3). The narrower plate (Fig. 19 c: pl 2, e) is 28 – 35 µm long (x = 32 µm; n = 3) and 13 – 21 µm wide proximally (x = 17 µm; n = 3). The bursal appendage is 111 – 115 µm long (x = 113 µm; n = 2) and 15 – 23 µm wide proximally (x = 19 µm; n = 2). In one specimen, the distal part of the bursal appendage (Fig. 19 a: ba, 19 b) appears to be branched in four thin tubes, and in other specimens, clearly in six.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F4BFFB61E98F9EDFD1DF9E7.taxon	description	Trigonostomum sp. 4 in Diez et al. (2023)	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F4BFFB61E98F9EDFD1DF9E7.taxon	materials_examined	Material and distribution. Cuba: Observations on live animals, whole mounted afterwards. Two whole mounts from Siboney (Type locality) (December 6, 2017), one of which is designated holotype (ZMH, No. V 13692) and the other paratype (HU, No. V 885); sublittoral, on the alga Dictyota sp., 4 m deep, salinity 33 ‰.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F4BFFB61E98F9EDFD1DF9E7.taxon	etymology	Etymology. Species named after Prof. Dr Yoandri Suárez Megna (Universidad de Oriente, Cuba), specialist in freshwater beetles.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F4BFFB61E98F9EDFD1DF9E7.taxon	diagnosis	Diagnosis. Species of Trigonostomum with a copulatory organ which consist of a stylet and two mantle plates. Funnel-shaped stylet ~ 24 μm long. One mantle plate is ~ 28 µm long and 17 – 18 µm wide proximally, tapering to a distal sharp tip. Second plate X shaped, ~ 21 µm long and 17 – 18 µm wide proximally; distally, it forms two sharp hooks, ~ 12 µm long. Bursal appendage 19 – 20 µm long as a whole, distally branching in two coiled tubes ~ 48 µm long and ~ 3 µm in diameter.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F4BFFB61E98F9EDFD1DF9E7.taxon	description	Description. The animals are 0.47 – 0.51 mm long (x = 0.49 mm; n = 2), measured on the whole mounts, translucent, with a pair of eyes (Fig. 20 a, b: e). The pharynx (Fig. 20 a, b: ph) is 74 – 80 µm long (x = 77 µm; n = 2), as measured on whole mounts, and located in the first body half. The paired testes (Fig. 20 a: t) are located at the body’s midpoint. The atrial organs are located in the second body half. The vasa deferentia form seminal vesicles that open into the copulatory bulb. The copulatory bulb encloses the prostate vesicle and copulatory organ. The sclerotised parts of the copulatory organ consist of the stylet proper and two mantle pieces. The funnel-shaped stylet (Fig. 20 a, d – f: st) is 22 – 25 µm long (x = 24 µm; n = 2) and 11 – 12 µm wide proximally. It tapers to a blunt distal tip. One plate of the mantle (Fig. 20 d – f: pl 1) is 26 – 29 µm long (x = 28 µm; n = 2) and 17 – 18 µm wide proximally; distally, it forms a triangular tip. The second plate of the mantle (Fig. 20 d – f: pl 2) is X shaped, 18 – 24 µm long (x = 21 µm; n = 2) and 17 – 18 µm wide proximally. Distally, it displays two triangular projections, 9 – 15 µm long (x = 12 µm; n = 4) which end in a pointed tip. The paired vitellaria extend laterally between the pharynx and copulatory bulb. The bursal appendage (Fig. 20 a; c: ba; g) is 19 – 20 µm long (n = 2), and consists of a proximal case and two distal, coiled tubes (~ 360 °), measuring 46 – 49 µm (x = 48 µm; n = 2) in length and ~ 3 µm in diameter.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F4CFFB01E98FF26FAABFE74.taxon	description	The length of the stylet of K. microstylus in the specimens from Cuba (23 – 43 µm long) broadens the range of 30 – 35 µm thus far mentioned in literature (Rieger, 1974). This author reported some degree of intraspecific variation in the morphology of the stylet, mainly in the distal part: it is either straight and slender, forms a pronounced hook or even is bifurcate in one specimen from Bermuda. Also in the specimens from Cuba, the same type of variation can be observed: some stylets show a distal hook (Fig. 3 b, d), while others are more straight (Fig. 3 c). These differences, however, are likely due to a difference in degree of squeezing, as the stylet is thin-walled and flexible. Nevertheless, K. microstylus appears paraphyletic in our analysis indicating that it might represent a species complex. The sequenced specimen indicated as ‘ K. microstylus B’ in our phylogeny was collected in Siboney and the specimens from this locality show a stylet with a typical distal hook (Fig. 3 b, d), matching the diagnostic characteristics of the species provided by Rieger (1974). On the other hand, specimens from Bueycabón, where the specimen ‘ K. microstylus A’ of our phylogeny was also collected, present an almost straight stylet (Fig. 3 c). These morphological and molecular phylogenetic differences suggest that K. microstylus, may constitute an unresolved species complex.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F4CFFBF1D20FD93FD66F95B.taxon	description	A common characteristic of the three new species described from Cuba is the presence of two types of anterior rhabdite tracts. One type presents filiform rhabdites (Fig. 7 d: ar 2) and in the other type the rhabdites are thicker (Fig. 7 d: ar 1). The presence of different types of anterior rhabdite tracts was not mentioned in the description of the other two previously known species (see De Clerck & Schockaert, 1995). The general internal morphology of all species of Gaziella is similar and they mostly differ in the detailed morphology of the male copulatory bulb. Although the position of the pharynx is not a strong characteristic to differentiate among species of Gaziella, this structure is located at mid body (G. pileola and G. microcirra sp. n.) or in the second body half (G. lacertosa, G. cochleata sp. n., and G. glandulosa sp. n.). Gaziella pileola is readily distinguished from its congeners by its very long cirrus (249 – 305 μm; x = 270 µm), which is smaller in the other four species: G. glandulosa sp. n. 94 μm, G. lacertosa 48 – 78 μm (x = 64 µm), G. cochleata sp. n. 26 – 54 μm (x = 44 µm), and G. microcirra sp. n. 33 – 51 μm (x = 41 µm). From these measurements, it is clear that also G. glandulosa sp. n. is well recognised by its cirrus length. Similarly, in both G. pileola and G. glandulosa sp. n. the sclerotised cap surrounds the most distal end of the cirrus (10 % and 20 % of its length, respectively). In G. cochleata sp. n. and G. microcirra sp. n., the sclerotised cap surrounds at least the distal 60 % of the cirrus, whereas in G. lacertosa, it surrounds the distal 30 %. A unique feature of G. glandulosa sp. n. is the fact that the proximal 80 % of its cirrus is devoid of spines and shows thick glandular walls. In all other species of Gaziella, the cirrus is fully covered by spines. Gaziella cochleata sp. n. is the only species of the genus where the distal cap of the copulatory bulb is a spiralised plate, a clear diagnostic feature of this species. Gaziella microcirra sp. n. exhibits a cirrus similar in morphology to that of G. lacertosa. However, the average length of the cirrus of G. lacertosa (64 µm) is larger than that of G. microcirra sp. n. (41 µm). Furthermore, a distinguishing feature of G. microcirra sp. n. is the fact that the walls of its cirrus are partially sclerotised and form distinct, lamellar-like structures (see Figs. 6 g and 8 e). Representatives of Moevenbergia Armonies & Hellwig, 1987 (formally Promesostomidae, Brinkmanniellinae), are morphologically similar to Gaziella. These genera differ from each other by the presence of two extracapsular seminal vesicles and a pair of seminal reservoirs on each oviduct in Moevenbergia (Armonies & Hellwig, 1987), whereas there is a single intracapsular seminal vesicle and a single seminal reservoir on each oviduct in Gaziella (De Clerck & Schockaert, 1995). Recently, Armonies (2017) described a second species of Moevenbergia: M. oculofagi Armonies, 2017. However, M. oculofagi exhibits two traits typical of Gaziella: the presence of a strong, anterior, proboscis-like structure and a single and well-developed, intracapsular seminal vesicle (Armonies, 2017). Species of Moevenbergia do not have an anterior, proboscis-like structure (Armonies & Hellwig, 1987). Seminal receptacles were not observed in M. oculofagi, but the development of these structures depends on the reproductive state of the specimens and sometimes are not observable (i. e., when not filled with sperm). Therefore, we suggest M. oculofagi to be transferred to Gaziella (now G. oculofagi comb. n.). Gaziella oculofagi comb. n. is similar to G. microcirra sp. n.; however, the former has a smaller cirrus (x = 32 µm long) and does not exhibit the sclerotised lamellae in the cirrus characteristic for G. microcirra sp. n. Following this reasoning, Gaziella now contains six species, three of which are described in this paper. Further molecular phylogenetic analyses are necessary to elucidate the relationships between Gaziella and Moevenbergia.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F43FFBE1E98F920FE30FDCA.taxon	description	All species of Brinkmanniella possess a more or less funnel-shaped stylet, the detailed morphology of which is the main feature to distinguish between them. In B. macrostomoides Luther, 1948, and B. procerastyla Ehlers, 1974, the stylet is curved and tapers toward a sharp distal tip, which clearly distinguishes them from all other species of the genus, including the ones described in this contribution. The ruffled stylet tip of B. augusti Marcus, 1951; B. obtusa Luther, 1948; and B. palmata Karling, 1986 is typical of these three species and is not seen in the new species. Brinkmanniella microps Schockaert & Martens, 1985, possesses a straight stylet, although the distal tip of the stylet in the holotype is bent, which is caused by the fixation procedure (for a discussion, see Schockaert & Martens, 1985). The shape of the stylet in B. microps most closely resembles that of the two new species, but it is much smaller: 30 µm vs 60 µm in B. simplex sp. n. and ~ 59 µm in B. tenebrosa sp. n. The stylet of B. australiensis Willems et al., 2004 a, is similar in length (57 µm) to that of the new species. However, it is 32 µm wide proximally, funnel shaped and constricted at about its midpoint, which is not the case in the new species from Cuba. The two new species can be distinguished from each other by the fact that the stylet of B. tenebrosa sp. n. is more tubular, with its widest part located a short distance from its proximal end, a feature unique among all species of Brinkmanniella. The stylet of B. simplex sp. n. consists of a wide proximal funnel, gradually tapering towards a rounded tip. Dark pigmentation as observed in B. tenebrosa sp. n. has only been reported in B. microps. However, in the latter species, the pigmentation is dark grey-brown, while in B. tenebrosa sp. n., it is black. In B. augusti, the pale-yellow colouration of the specimens is caused by fine pigment distributed in the parenchyma (Marcus, 1951), whereas, in B. tenebrosa sp. n. is caused by fine epidermal granules. The pale-yellow colouration of B. australiensis is probably also due to such a pigment type as in B. augusti. The pronounced proterandry observed in some species of Brinkmanniella was once considered a typical feature of the genus (see Karling, 1986). However, Schockaert and Martens (1985) did not observe protandry in B. microps, nor is it the case for B. australiensis (see Willems et al., 2004 a). Also in the two new species, male and female gonads are fully developed simultaneously, providing further evidence that pronounced proterandry cannot be considered a general or diagnostic trait of Brinkmanniella.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F42FFBE1E98FDB1FBDDF925.taxon	description	The newly described species, Byrsophlebs thalassicola sp. n., can unambiguously be placed in Byrsophlebidae as it shows the above-mentioned characteristics of the family. The position of B. thalassicola sp. n. within Byrsophlebs was confirmed by the phylogenetic analysis. Byrsophlebs thalassicola sp. n. constitutes a monophyletic clade together with an unidentified species of Byrsophlebidae, Byrsophlebs sp., and Byrsophlebs delamarei (Ax, 1956) Karling, 1985. In addition, the new species possesses a bursa, a feature present only in two genera of byrsophlebids: Byrsophlebs and Maehrenthalia. These genera can be distinguished from each other by the morphology of the female reproductive system: species of Maehrenthalia lack a seminal receptacle in the female duct and their bursa is bipartite, consisting of a uterus and a terminal resorptive vesicle; representatives of Byrsophlebs have a female duct with a seminal receptacle and a bursa without resorptive vesicle (see Karling, 1985). The Cuban specimens exhibit the latter morphology, corroborating their placement in Byrsophlebs. Byrsophlebs and Maehrenthalia also differ in the morphology of the male copulatory bulb, being globular-oviform with two layers of strong spiral muscle fibres in Byrsophlebs, and cylindrical with a single layer of strong spiral muscle fibres in Maehrenthalia. However, in B. thalassicola sp. n., the external muscle layer has a longitudinal orientation, a unique pattern of compared with all other species of Byrsophlebs. All species of Byrsophlebs possess a simple, funnel-liketo-tubular stylet. In B. thalassicola sp. n., the distal tip of the stylet is hook shaped. This is the case in most species of this genus, except for B. dubia (Ax, 1956) Karling, 1985, and B. graffi Jensen, 1878. Those species with a distal hook on the stylet differ from each other in the detailed morphology of the stylet and other atrial organs. In B. dubia, B. delamarei, and B. graffi, the stylet gradually tapers to a distal tip, as occurs in some of our specimens (Fig. 9 e), whereas in other specimens of B. thalassicola sp. n., the stylet has a well-differentiated, proximal funnel-like and distal tubular part (Fig. 9 c, d). A similar stylet morphology is seen in B. caligulachaena and B. lutheri (Marcus, 1952) Karling, 1985. The stylet of B. thalassicola sp. n. is ~ 46 µm long, compared to a length of ~ 36 µm in B. caligulachaena (Ehlers & Ehlers, 1981) and ~ 43 µm in B. lutheri (Marcus, 1952). While the stylet length of B. thalassicola sp. n. corresponds to that of B. lutheri, its stylet is more similar in shape to that of B. caligulachaena. The distal tip of the stylet of B. lutheri resembles a fishing hook, with the tip pointing forward; in B. thalassicola sp. n. and B. caligulachaena, the distal tip is directed sideways. In one specimen of B. thalassicola sp. n. (Fig. 9 e), the distal tip of the stylet points forward. However, considering the delicate construction of the stylet, this situation is most likely a fixation artefact. Indeed, in the live specimen, the stylet had the same morphology as that of the other specimens. The distal tip of the stylet is pointed in B. thalassicola sp. n., while it is blunter in B. caligulachaena. As mentioned before, a unique feature of B. thalassicola sp. n. is the longitudinal orientation of the external muscle fibres surrounding the prostate vesicle, whereas it is oblique in all other species of Byrsophlebs. Another diagnostic trait of B. thalassicola sp. n. is the fact that the bursa opens proximally into the female atrium, whereas this connection occurs more distally in its congeners. The presence of a bursal sphincter at the connection with the female duct in B. thalassicola sp. n. is uncommon in Byrsophlebs and has only been described for B. delamarei (Ax, 1956). The seminal receptacle as a differentiation of the proximal part of the female duct, apart from the new species, has only been reported in B. caligulachaena. The sphincter surrounding the distal part of the oviduct is a feature shared by B. thalassicola sp. n. and B. uncinata.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F42FFBD1D20F902FE9CFA2F.taxon	description	The only molecular data available for Kymocarens is the sequence of the 18 S rDNA gene of Kymocarens sp. (Van Steenkiste et al., 2013). Unfortunately, we failed to amplify the 18 S gene for K. morrisi and only the amplification of the 28 S gene was succesful. Therefore, we did not include K. morrisi in the phylogenetic analyses. Consequently, we cannot address the monophyly of Kymocarens and the discussion of the new species is based on comparative morphology. Three species of Kymocarens have previously been described, and K. morrisi sp. n. can be distinguished from these by the morphology of the stylet. In K. proxenetoides Ehlers & Ehlers, 1981, the elongated and funnel-shaped stylet is 49 – 50 μm long, whereas in K. tibialis Ehlers & Ehlers, 1981, it is 30 μm long with a complex distal end (see Ehlers & Ehlers, 1981; Willems et al., 2005 a). In K. kanakorum Willems et al., 2005 a, the stylet is 56 μm long and shows a typical transverse ridge distally (Willems et al., 2005 a). Kymocarens morrisi sp. n. displays a longitudinal slit in the proximal end of the stylet. This feature combined with the fact that the stylet bends over 90 ° at its midpoint are diagnostic for the new species. Furthermore, measuring 66 – 89 µm long, the new species possesses the longest stylet ever reported for a species of Kymocarens. The general morphology of the atrial organs of K. morrisi sp. n. does not differ from that in K. proxenetoides and K. tibialis. However, the parenchymal sheath surrounding the bursa is unique for K. morrisi sp. n. Also, the sphincter on the distal aperture of the pharynx has never been reported in any other representative (but note that both features are unknown for K. kanakorum, as no sectioned material of this species exists).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F41FFBB1E98FA17FD30F8DD.taxon	description	Promesostoma cubitum sp. n. is the only species of this species group that has only one seminal vesicle, whereas there is a pair of them in all other species. Furthermore, the proximal elbow-shaped projection of the stylet of P. cubitum sp. n. (Figs. 13 b and 15 c) is also unique. Apart from the differences mentioned above, P. cubanum sp. n. differs from each of the other species in this group in several details. It is the only species of the group without male bursa, and it is the only one that has a muscular bulb with a proximal sperm-containing vesicle connected to the genital atrium (Fig. 13 d: x). Promesostoma norvegicum has a strongly curved stylet, with the distal end irregularly club shaped and a tooth-like edge, which is not the case in P. cubanum sp. n. In P. tenebrosum the stylet has a proximal funnel surrounded by three sphincters and an oblique distal end. Moreover, it is the only species within the group that lacks eyes. The combination of these features unambiguously differentiates P. tenebrosum from P. cubanum sp. n., which has eyes, a single proximal sphincter around the funnel of the stylet, and a stylet with a rounded distal end.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F41FFBB1E98FA17FD30F8DD.taxon	description	The sister group of clade ‘ cochleare ’ comprises a trichotomy of P. neglectum and two monophyletic clades (‘ roseapharynx ’ and ‘ marmoratum ’; Fig. 22). Karling (1967) placed P. neglectum in a group of species characterised by a proximally coiled stylet, four of which form the clade ‘ marmoratum ’. In addition to this typical stylet, these four species also share a well-developed male copulatory bursa and a relatively small seminal receptacle, incorporated in, or positioned next to, the bursa. Other species showing this unique combination of traits are P. ensifer (Uljanin, 1870) Pereyaslawzewa, 1892; P. gracile Ax, 1951; P. karlingi Ehlers, 1974; P. kristenseni Ax, 1993; and P. sartagine Ax & Ehlers, 1973. However, Karling (1967) excluded P. gracile from this group because its stylet is curved, not coiled, and excluded P. ensifer from his discussion because of the lack of detailed morphology of the stylet. The phylogenetic analyses, however, cannot unambiguously confirm the position of P. neglectum within this group, as its position remains unresolved. According to Karling (1967), P. neglectum is different from the other species in this group because of the presence of a glandular organ opening near the aperture of the male atrium to the common atrium, as occurs in P. norvegicum and P. spiriferum Karling, 1967. Unfortunately, these species were not included in the phylogenetic analysis and future studies will be needed to reveal if the presence of this glandular organ is a synapomorphy of these three species. Because of its morphological resemblance with some species in clade ‘ marmoratum ’ (P. caligulatum and P. meixneri), it can be conjectured that also P. panamaense sp. n. belongs to this clade. Indeed, P. panamaense sp. n. also possesses a proximally coiled stylet and a copulatory bursa. However, the absence of a seminal receptacle in P. panamaense sp. n. distinguishes it from the other species in clade ‘ marmoratum ’. Other species resembling P. panamaense sp. n. are P. infundibulum, and P. minutum; the former, however, lacks a copulatory bursa. The stylet is very long and involves several coils in P. meixneri (710 – 720 µm) and two to three coils in P. caligulatum (1.170 – 1.350 µm) and P. infundibulum (296 – 307 µm long). In P. panamaense sp. n. and in P. minutum, the stylet involves a single coil (Fig. 13 e). Promesostoma panamaense sp. n. can be distinguished from the latter (and the other three) species as its stylet is much shorter (~ 88 µm) compared to the 430 – 490 µm reported for P. minutum (Ax, 1956). Promesostoma panamaense sp. n. also differs from P. minutum in the morphology of the distal end of the stylet, which bears a wing and a pointed projection in the later species. In P. panamaense sp. n., the stylet end is oblique or rounded and no wing is present. From the above, it is still unclear which morphological characters are indeed diagnostic for clade ‘ marmoratum ’ and which species can be included there. This can only be solved by incorporating more species into the molecular analyses and / or additional morphological markers. The two species with a known morphology included in clade ‘ roseapharynx ’ (P. dipterostylum and P. roseapharynx sp. n.) each possess a well-developed male copulatory bursa. Apart from that, it is difficult to pinpoint morphological characters diagnostic for this clade. Moreover, this feature is not unique for these two species (see discussion above). In P. roseapharynx sp. n., the prostate vesicle is oriented forward, entering the stylet, which shows a proximal> 90 ° bent. This is also the case in six other species of Promesostoma: P. alaskanum Ax & Armonies, 1990; P. dennisalleni Ax, 1995; P. digitosum Ax, 1995; P. fibulatum Ax & Armonies, 1987; P. nynaesiense Karling, 1957; and P. teshirogii Ax, 1992. In two of these species, P. digitosum and P. fibulatum, the stylet is distally branched, distinguishing it clearly from the unbranched stylet of P. roseapharynx sp. n. Measuring ~ 177 µm in length, the stylet of P. roseapharynx sp. n. is shorter than that P. nynaesiense (363 – 399 µm), P. alaskanum (250 µm), and P. teshirogii (200 µm), but larger than that of P. dennisalleni (120 – 130 µm long). Furthermore, the stylet of P. dennisalleni shows an asymmetric thickening of its distal opening (Ax, 1995) and it is proximally rolled up in P. alaskanum (Ax & Armonies, 1990), which is not the case in P. roseapharynx sp. n. In P. teshirogii, the copulatory bursa is elongated, oriented forward, and reaches the caudal part of the brain, whereas in P. roseapharynx sp. n., it is globular, located just anterior to the pharynx and is oriented sideways. The stylet of Promesostoma baculum sp. n. is approximately 90 ° bent proximally and in that respect comparable with that of P. bilobatum Ax & Armonies, 1987; P. dipterostylum Karling, 1967; P. nynaesiense Karling, 1957; and P. teshirogii. The stylet of P. baculum sp. n. does not carry distinctive ornamentations, such as the distal spoon-shaped oval plates in P. bilobatum (see Ax & Armonies, 1987), or the proximal wing-like structures in P. dipterostylum (see Karling, 1967). The stylet of P. baculum sp. n. is 93 µm long, much shorter than that of P. nynaesiense (363 – 399 µm), P. dipterostylum and P. teshirogii (~ 200 µm), and P. bilobatum (~ 210 µm).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F47FFBB1D20FF40FA12F9C6.taxon	description	Also, the populations in Cuba differ substantially from each other as to the length of the bursal appendage, ranging from ~ 62 µm in the population from Bahía Larga to 105 µm in the specimen from Bueycabón. Moreover, the specimen from Bueycabón shows a bursal appendage with two distal tubes, as was also mentioned for the specimens from Bermuda (Karling, 1978). In the populations from Bahía Larga and Galapagos Islands (Ehlers & Ax, 1974), only one distal tube is present. Considering these size differences and the wide distribution of the species, it might be that C. paragracilis comprises a species complex. Also in C. axi, a variable number of distal tubes is reported, which even lead to the recognition of two different species: C. axi (1 distal tube) and C. bifida Ehlers & Ax, 1974 (2 distal tubes). However, Willems et al. (2004 a) considered both species to be one and the same (C. axi), a view we follow here. Yet, Willems et al. (2005 b) and other authors (e. g. Van Steenkiste & Leander, 2018) also expressed the possibility that C. axi is a species complex. Following this logic, and because the number of specimens is low for all sampled populations, we opt to keep all populations of C. paragracilis in one species for the time being. To bring more clarity, an extensively sampled dataset including sufficiently fast-evolving markers and representing specimens of all species from different localities is needed.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F46FFB91E98FF26FB80FC3A.taxon	description	In the newly presented phylogeny, three clades of Trigonostomum are recovered (Fig. 23), whereas T. penicillatum is the sister species to a monophyletic clade formed by these three clades. Only group 2 of Willems et al. (2004 b) forms a monophyletic clade in our analysis (see clade ‘ armatum ’ in Fig. 23). All these species are characterised by a stylet showing a number of spirals (½ in T. franki to 5 ½ in T. tori) and the mantle following the course of the stylet. In this group, the bursal appendage consists of two tubules attached by a ring to the bursa, with both tubes coiled over 360 ° (for more details see Willems et al., 2004 b). Although we named the species groups supported by our phylogenetic analysis, we are not proposing a new classification system for Trigonostomum due to the similarity of our results with those of Hu et al. (2019). Particularly, we refrain to propose a species group to T. penicillatum because it is the only species of the group type 1 of Hu et al. (2019) included in phylogenetic analyses.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F46FFB91E98FF26FB80FC3A.taxon	description	All the species in clade 3 are characterised by the sclerotised parts of the copulatory organ consisting of two mantle plates that run parallel to each other and differ in width — the thinner plate located in between the wider plate and the tubiform stylet. Moreover, all species have a bursal organ that consists of a heavily coiled tube that distally splits into a number of finer tubes. Both features could be morphological apomorphies for this clade. Because of lack of material, T. yoandrisi sp. n. could not be included in the phylogenetic analyses. The morphology of the atrial organs of this species is similar to those of the species included in group 1 B of Willems et al. (2004 b), but these species are now spread out over our clades 1 and 3. Trigonostomum yoandrisi sp. n. shows the two typical features (apomorphies?) mentioned above for clade 3, and therefore, we provisionally consider it to belong to that clade. In what follows, we will compare the new species with the species of group 1 B of Willems et al. (2004 b).	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
0C0210596F46FFB91E98FF26FB80FC3A.taxon	description	Considering the fact that we suppressed Brinkmanniellinae and that other taxa previously included in this subfamily, except Gaziella, cluster in a fully supported clade in our phylogenetic analysis together with Litucivis serpens, we raise Adenorhynchinae to family rank (Adenorhynchidae status novus). We also include in the new family all other members of Adenorhynchinae (Adenorhynchus, Listea, and Scoliopharyngia). The only representative of Adenorhynchinae included in the phylogenetic analyses was L. serpens. However, Adenorhynchinae is a morphologically homogeneous group (Ax & Heller, 1970). These characteristics are also present in the brinkmanniellinids transferred to Adenorhynchidae status novus. Furthermore, all representatives of Adenorhynchidae status novus possess the testes anterior to the pharynx (except in Litucivis, where the testes are caudally located to the pharynx, a plesiomorphic condition). Other representatives of the suppressed Brinkmanniellinae also share most features of Adenorhynchidae status novus. However, considering the diversity of the group, they are retained within Promesostomidae until new molecular information is available.	en	Diez, Yander L., Monnens, Marlies, Wuyts, Arlien, Brendonck, Luc, Reygel, Patrick, Schmidt-Rhaesa, Andreas, Artois, Tom (2023): Taxonomy and phylogeny of Dalytyphloplanida Willems et al., 2006 (Platyhelminthes: Rhabdocoela), with the description of a new family, a new genus, and sixteen new species from Cuba and Panama. Organisms Diversity & Evolution (New York, N. Y.) 23 (4): 631-681, DOI: 10.1007/s13127-023-00623-w, URL: http://dx.doi.org/10.1007/s13127-023-00623-w
