Ctenorillo tayrona López-Orozco, Borja-Arrieta & Campos-Filho, 2023

Carpio-Díaz, Yesenia M., López-Orozco, Carlos Mario, Borja-Arrieta, Ricardo, Gutierrez-Estrada, Miguel, Campos-Filho, Ivanklin Soares, Sfenthourakis, Spyros, Taiti, Stefano, Moreno, Jhon Cesar Neita, Bermúdez, Adriana, Navas-S., Gabriel R. & Bichuette, Maria Elina, 2023, The genus Ctenorillo Verhoeff, 1942 (Oniscidea, Armadillidae) from Colombia: new records, new species, and conservation comments, Tropical Zoology (trop. Zool.) 36 (3 - 4), pp. 53-84 : 76

Ctenorillo tayrona López-Orozco, Borja-Arrieta & Campos-Filho n. sp.

Figures 1 , 17 , 18

urn:lsid:zoobank.org:act:8273CDBA-B15E-44B7-8111-4BAF1D8ED435

Material examined

COLOMBIA: Holotype ♀ (parts in micropreparations) ( CBUDC-CRU 342 ), Magdalena, Santa Marta, Sierra Nevada de Santa Marta, Sector Bahía Concha , 11°17’32.28”N 74°9’12.8”W, 16 August 2018, leg. C.M. López-Orozco and R. Borja-Arrieta.

Description

Length: 2.5 mm. Color brown with typical pale muscular insertions; entire body strongly pigmented. Dorsum covered with short rounded tubercles, arranged as follows ( Figure 17A,B ): vertex of cephalon with ten tubercles in three rows, anterior row with four tubercles, middle row with two tubercles, posterior row with four tubercles; pereonite 1 with four tubercles on anterior row, eight tubercles on middle, and seven tubercles on posterior row; pereonites 2-7 with six tubercles on anterior row, and nine tubercles on posterior row; pleon smooth, telson with two median tubercles. Dorsal surface with short triangular scale-setae ( Figure 17C ). Pereonites 1-7 epimera with one line of noduli laterales per side inserted on postero-lateral surface of second outer tubercle. Cephalon ( Figure 17 D-F) with frontal shield rectangular, not protruding above vertex; eyes of eight ommatidia. Pereonite 1 epimera grooved on lateral margins, inner lobe of schisma rounded, slightly extending beyond posterior margin of outer lobe; pereonites 2 and 3 epimera subtriangular, outer margin rounded, epimera 4-7 rectangular; pereonite 2 with ventral lobe subtriangular, distal margin rounded, slightly extending beyond posterior margin of outer lobe ( Figure 17A,F,G ). Pleonites 3-5 epimera rectangular ( Figure 17H,I ). Telson ( Figure 17H ) hourglass-shaped, proximal part broader than distal part, straight distal margin. Antennula ( Figure 17J ) of three articles, proximal and distal articles subequal in length, distal article bearing three apical aesthetascs. Buccal pieces ( Figure 18 A- E) as in Ctenorillo binomio n. sp. Uropod ( Figures 17I , 18F ) protopod trapezoidal, flattened, basal part enlarged, medial margin straight; exopod tiny, inserted dorsally below distinct lobe near median margin. Pereopods 1 and 7 ( Figure 18G,H ) with no particular modifications; pereopod 1 carpus with antennal grooming brush transverse, and distal setae apically cleft; dactylus with ungual and dactylar seta simple. Pleopods 1-5 exopods with monospiracular lungs.

Etymology

The new species is named after the Tayrona people, an indigenous group that inhabited areas of the Sierra Nevada de Santa Marta.

Remarks

In the absence of the dorsal tubercles of the pleon, Ctenorillo tayrona n. sp. is similar to C. strinatii and C. humboldti n. sp. It can de distinguished by the shape, number and arrangement of the dorsal tubercles of the cephalon and pereon (see Schmalfuss and Ferrara 1983). In the comparison with the Neotropical species, it differs in having the cephalon with 10 tubercles, pereonite 1 with 19 tubercles, pereonites 2-7 with 15 tubercles, and antennula with three aesthetascs.

Figures

Figure 1. Map of Ctenorillo species from Colombia. Light to dark gray areas= Andean Cordillera; Light green areas= Tropical Dry Forest; Dark green lines= Colombian conservation units.

Figure 17. Ctenorillo tayrona López-Orozco, Borja-Arrieta & Campos-Filho n. sp., ♀: A, habitus, lateral view; B, dorsal tubercles scheme; C, dorsal scale-seta; D, cephalon, dorsal view; E, cephalon, posterior view; F, cephalon and pereonites 1 and 2, frontal view; G, pereonites 1 and 2 epimera, ventral view; H, pereonite 7, pleon, telson, and uropods, dorsal view; I, pleonites 3-5, telson, and uropods, ventral view; J, antennula; K, antenna.

Figure 18. Ctenorillo tayrona López-Orozco, Borja-Arrieta & Campos-Filho n. sp., ♀: A, left mandible; B, right mandible; C, maxillula; D, maxilla; E, maxilliped; F, uropod; G, pereopod 1; H, pereopod 7.