Cyclocosmia sublatusicosta, Yu & Zhang, 2018

Yu, Kun & Zhang, Zhi-Sheng, 2018, On three species of the trapdoor spider Genus Cyclocosmia from China (Araneae, Halonoproctidae), Zootaxa 4532 (2), pp. 248-256 : 251

Cyclocosmia sublatusicosta sp. nov. (ĹÎḃflnff)

Figures 3A – E , 4 A–D, 7B, 8C

Material examined. CHINA. Holotype male, Guangdong Province, Qingyuan City , no detailed locality, 6 October 2015 ( SWUC).

Etymology. The specific name refers to its similarity to Cyclocosmia latusicosta .

Diagnosis. The male of the new species is similar to that of C. latusicosta ( Figs 1 A–E, 2A–D) in having the similar pedipalp, but differs in the opisthosomal disc with slender ribs and grooves, without endocentric concavities in the upper muscle impressions. Two septal ribs between the upper muscle impressions ( Figs 4A , 8C ) are longer than in C. siamensis ( Schwendinger 2005: 239, figs 28–30), C. lannaensis ( Schwendinger 2005: 249, figs 53–55) and C. subricketti sp. nov., and the ends of these ribs are flush with the bottom of the central muscle impressions.

Description. Male (Holotype; Figs 3 A–E, 4A–D, 7B, 8C). Total length (including chelicerae) 18.51; chelicerae 2.64, carapace 7.80 long, 7.51 wide; abdomen: 8.07 long, 7.31 wide. Carapace and chelicerae black; chelicerae short, broad, paturon with rastellum. Abdomen tawny, with hard opisthosomal disc with 66 ribs arranged in total. Eight eyes on tubercle. Ocular area: 1.02 long, anteriorly wide 2.21, posteriorly wide 2.17, ALE: AME: PLE: PME (0.52: 0.39: 0.37: 0.31), ALE–AME 0.32, AME–AME 0.22, PLE–PME 0.10, PME–PME 0.96. MOA 0.88 long, front width 1.00, back width 1.47. Clypeus height 1.04. Maxilla 0.89 long, 1.30 long. Sternum 4.52 long, 4.40 wide. Legs reddish black. Leg measurements: I 25.00 (8.34, 2.72, 6.15, 5.56, 2.23); II 20.29 (6.39, 2.74, 4.63, 4.54, 1.99); III 19.12 (5.95, 2.18, 3.65, 4.53, 2.81); IV 24.05 (6.85, 2.56, 4.66, 6.65, 3.33). Leg formula: 1423. Tibia width (1.93: 1.91: 2.25: 2.36). Pedipalpal bulb sclerotized and smooth. Embolus long.

Female unknown.

Distribution. Known only from Qingyuan City, Guangdong Province, China.

Figures

FIGURE 1A–G. Cyclocosmia latusicosta Zhu, Zhang & Zhang, 2006, male (A–E) and female (F–G). A. Male habitus, dorsal view. B. Same, ventral view. C. Left male pedipalp, prolateral view. D. Same, ventral view. E. Same, retrolateral view. F. Female vulva, dorsal view. G. Opisthosomal disc of female, caudal view.

FIGURE 3A–E. Cyclocosmia sublatusicosta sp. nov., male holotype. A. Male habitus, dorsal view. B. Same, ventral view. C. Right male pedipalp, prolateral view. D. Same, ventral view. E. Same, retrolateral view.

FIGURE 4A–D. Cyclocosmia sublatusicosta sp. nov. A. Opisthosomal disc, caudal view. B. Right male pedipalp, prolateral view. C. Same, ventral view. D. Same, retrolateral view.

FIGURE 8A–C. Caudal view of male opisthosomal discs. A. Cyclocosmia latusicosta Zhu, Zhang & Zhang, 2006. B. Cyclocosmia subricketti sp. nov.. C. Cyclocosmia sublatusicosta sp. nov.