Yaginumaella Prószyński, 1979

Wang, Cheng, Wang, Ying, Mi, Xiaoqi & Li, Shuqiang, 2025, Description of two new genera and seven new species of Plexippina Simon, 1901 (Araneae, Salticidae, Plexippini) from Southwest China, with a review of Yaginumaella Prószyński, 1979, ZooKeys 1257, pp. 215-247 : 215-247

publication ID	https://doi.org/10.3897/zookeys.1257.160127
publication LSID	lsid:zoobank.org:pub:531C5E66-8EF0-4124-BFD9-C21B7ACC317F
DOI	https://doi.org/10.5281/zenodo.17488084
persistent identifier	https://treatment.plazi.org/id/46C400DE-CE69-5C0A-84F2-4E7F2C3CFF5A
treatment provided by	ZooKeys by Pensoft
scientific name	Yaginumaella Prószyński, 1979
status

Treatment

Genus Yaginumaella Prószyński, 1979 View in CoL

Type species.

Pellenes ususudi Yaginuma, 1972 by original designation.

Diagnosis.

Yaginumaella resembles that of Ptocasius in having similar copulatory organs, but can be distinguished by the followings: 1) the presence of a posterior tegular lobe and lack of a tegular bump (Figs 7 B View Figure 7 , 9 B View Figure 9 , 11 B View Figure 11 , 13 B View Figure 13 , 15 C View Figure 15 ) vs lacking of a tegular lobe and having a tegular bump (modified into a pale area in the type species and its congeners) near the embolic base in Ptocasius ( Żabka 1985: figs 513, 517, 521; Cao et al. 2016: fig. 38 C, D; Patoleta et al. 2020: fig. 7 G, H); 2) the presence of a longitudinal, thoraical stripe (Figs 8 C, E View Figure 8 , 10 E, F View Figure 10 , 12 C, D View Figure 12 , 16 C, E View Figure 16 ) vs absent in Ptocasius ( Patoleta et al. 2020: figs 7 A, 8 A, 9 A; Logunov 2024: figs 125, 130); 3) the copulartory ducts are diverse in path (Fig. 8 B View Figure 8 , 10 C, D View Figure 10 , 12 B View Figure 12 , 14 B, D View Figure 14 , 16 B View Figure 16 ) vs very consistent, curved into almost U-shapes until forming median ridges, and then run posteriorly and continue to form distal coils encircled or around the distinct, elongate-oval sermathecae in Ptocasius ( Żabka 1985: fig. 526; Cao et al. 2016: fig. 38 B; Patoleta et al. 2020: fig. 8 G, H, 9 G, H). The female of Yaginumaella also somewhat resembles some of the species of Thyene Simon, 1885 mainly reported from East and South Asia, such as T. yuxi Xie & Peng, 1995 , in having a similar habitus and epigynal structure, but can be distinguished by the diverse path of copulatory ducts (Figs 8 B View Figure 8 , 10 C, D View Figure 10 , 12 B View Figure 12 , 14 B, D View Figure 14 , 16 B View Figure 16 ) vs relatively united, curved into almost U-shapes until forming median ridges, and then run posteriorly and continue to create several distal loops ( Wang et al. 2023 b: figs 49 B, 51 B); 2) the single retromarginal cheliceral tooth (see the below description of the Yaginumaella spp. ) vs a bifurcated tooth with two cusps in those of Thyene species (see the description in Wang et al. 2023 b).

Description.

Small to medium-sized spiders. Carapace almost square, and setose, mostly with pair of sub-marginal pale setal bands, and longitudinal, central stripe extending across thoracic surface. Chelicerae with typical dentition (two promarginal teeth and one retromarginal tooth), except Y. medog with two retromarginal teeth. Endites broadened distally, with pale disto-inner areas and disto-inner marginal dense setae. Labium tapered, covered with disto-marginal setae. Sternum almost shield-shaped, mostly with straight anterior edge. Legs vary in color and spiny. Dorsum of abdomen with longitudinal, central irregular patch; venter mostly with dotted lines.

Male palp: tibia mostly almost as long as wide except Y. medog with much longer tibia; retrolateral tibial apophysis mainly tapered, bifurcated or not; cymbium setose, with truncated or cambered anterior edge, and retrolateral process (just present in Y. qianlei ), tegulum swollen medio-posteriorly, with obvious posterior lobe; sperm duct runs along tegular submargin, and gradually thinner from retrolateral most portion; embolus originates from posterior or prolateral portion of tegulum, curved clockwise, and mostly with pointed tip.

Epigyne: with pair of epigynal hoods with different shapes and situations key to species identification; atrium mainly anteriorly located, with various sizes, copulatory openings slit-shaped, beneath lateral portions of atrium, copulatory ducts forming different paths, secondary spermatheca / accessory glands appear in limited species (such as Y. spinapophysis , could also be presented in Y. orthomargina , but not clear show); spermathecae without distinct broader, touched or separated each other; fertilization ducts lamellar, appear in anterior-most edges of spermathecae.

Composition.

The genus currently includes 78 species.

Distribution.

Bhutan, China, Japan, India, Kazakhstan, Korea, Myanmar, Nepal, Russia (Far East), Vietnam.

Comments.

54 species are transferred into the genus from Ptocasius and Menemerus because they are morphologically consistent with the type species and the related congeners. However, some species are uncertain, such as Y. pilosa , and Y. stemmleri , which present a different male palp from that of Yaginumaella , indicating they could not be actual members. They are also being transferred because they should have a similar habitus with Yaginumaella rather than Ptocasius (although their habitus has not been shown, a typical pattern of the described species in Żabka, 1981 was provided ( Żabka 1981: fig. 3), which is consistent with Yaginumaella ) and thus their generic position also needs further confirmation. The generic position of some remainders in Ptocasius , also requires additional attention. For example, P. linzhiensis ( Hu, 2001) (transferred from Morgus) shares similar copulatory organs with the type species, but the habitus information is lacking, making the generic position cannot be confirmed appropriately; P. dian Wang, Mi & Peng, 2023 and P. vittatus Song, 1991 present a similar habitus pattern to the type species, but different in epigynal structure. Moreover, species described by Żabka (1981) and Yang and Peng (2023) are mostly known only from single females, and some of them share very similar epigynal structures, indicating the presence of potential synonyms and the need for further taxonomic revisions. Ptocasius zabkai Yang & Peng, 2023 and Y. zonata were collected in the sites close to each other and share indistinguishable epigynal structures and thus are considered conspecific. We act as First Revisor per ICZN (1999) and assign the former as a synonym of the latter. Thyene incognita ( Żabka, 1981) , comb. nov. is proposed because the path of the copulatory duct is almost identical to some of the Asian Thyene species. Pancorius lobatus (Peng, Tso & Li, 2002) , comb. nov. (transferred from Yaginumaella ) is proposed because it is closely similar to P. submontanus Prószyński, 1992 , and it could be a junior synonym of the latter.