Cyclocosmia subricketti, 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 : 251-256

Cyclocosmia subricketti sp. nov. (ĹfflDzflnff)

Figures 5A – G , 6 A–D, 7C, 8B, 9A

Material examined. CHINA. Holotype female, Chongqing municipality, Beibei District, Jinyun Mountain National Nature Reserve, Yunhe Administrative Station , 29°50′30″ N, 106°21′31″ E, Elev. 248m, pitfall trap, 6 July 2008, H.L. Wang, M. Zeng and Z.H. Liu leg. ( SWUC) ; Paratypes: 1 female, Yunhe Administrative Station , pitfall trap, 29 September 2011, L.Y. Wang leg. ( SWUC) ; 2 males, Jinyun Mountain Nature Reserve, Guankou Administrative Station , 29°42′159″ N, 106°17′25″ E, Elev. 517m, pitfall trap, 15 September 2011, L.Y. Wang leg. ( SWUC).

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

Diagnosis. The new species is similar to C. ricketti ( Pocock 1901: 209, pl. 21, fig. 1; Schwendinger 2005: 227, figs 2–8, pl. 1D), C. siamensis ( Schwendinger 2005: 231, figs 9–30, pl. 1C and C. liui ( Xu et al. 2017: 82, figs 3A– F), but differs from the others by the pattern of the opisthosomal disc ( Figs 5G , 8B ). Two septal ribs between upper muscle impressions of the new species are connected with transverse ribs between upper and middle impressions and radial ribs, other than the isolated and hollow ones of C. ricketti . The second transverse rib between upper and middle impressions of the new species is separated from radial ribs, different from C. siamensis and C. lannaensis The upper muscle impressions without the endocentric concavity ( Figs 5G , 8B ), different to C. latusicosta ( Figs 1G , 8A ). The central muscle impressions without the endocentric concavity, different from C. liui . Top of spermatheca is nearly quadrate, different from C. truncata ( Gertsch & Platnick 1975: 6, fig. 25), C. torreya ( Gertsch & Platnick 1975: 12, fig. 26) and C. loricata ( Gertsch & Platnick 1975: 15, fig. 27).

Description. Female (holotype; Figs 5B, 5 F–G, 6A). Total length (including chelicerae) 29.25; chelicerae 3.58 long; carapace 9.93 long, 6.43 wide; abdomen 15.74 long, 13.06 wide. Carapace and chelicerae reddish brown, carapace smooth, fovea transverse. Chelicerae with rastellum composed of short thorns on both paturon. Eight eyes, on tubercle. Ocular area 0.94 long, anteriorly width 2.67, posteriorly width 2.69. ALE: AME: PLE: PME (0.42: 0.31: 0.41: 0.49), ALE–AME 0.53, AME–AME 0.33, PLE–PME 0.12, PME–PME 1.12. MOA 1.15 long, front width 0.99, back width 1.78. Clypeus height 1.22. Maxilla 1.42 long, 2.13 wide. Sternum 5.47 long, 5.89 wide. Legs reddish brown, short and thick. Leg measurements: I 17.78 (6.00, 2.68, 4.17, 3.01, 1.92); II 14.59 (5.18, 1.92, 3.06, 2.53, 1.90); III 14.65 (5.14, 3.10, 2.32, 1.95, 2.14); IV 18.40 (5.94, 3.12, 3.45, 3.32, 2.57). Leg formula: 4132. Tibia width (2.14: 1.97: 2.71: 2.52). Abdomen black-brown, with sclerotized opisthosomal disc. About 64– 68 ribs on opisthosomal disc in total.

Male (one of paratypes) ( Figs 5A, 5 C–E, 6B–D). Total length (including chelicerae) 22.78; chelicerae 3.03; carapace 7.01 long, 6.43 wide; abdomen 12.65 long, 8.49 wide. Carapace and chelicerae brownish black; chelicerae short, broad, paturon with rastellum. Abdomen tawny, with disc, pattern on disc similar to female. Eight eyes on low tubercle. Ocular area long 0.94, anteriorly wide 1.82, posteriorly wide 1.87, ALE: AME: PLE: PME (0.36: 0.36: 0.34: 0.32), ALE–AME 0.27, AME–AME 0.29, PLE–PME 0.11, PME–PME 0.77. MOA long 0.91, front width 0.90, back width 1.28. Clypeus height 0.69. Maxilla long 0.98, wide 1.49. Sternum long 4.17, wide 4.02. Legs rufous, longer than those of female. Leg measurements: I 22.96 (7.15, 2.45, 5.84, 5.03, 2.49); II 18.35 (5.49, 2.03, 4.12, 4.22, 2.49); III 18.00 (5.20, 2.18, 3.58, 4.26, 2.78); IV 23.24 (6.35, 2.55, 4.86, 5.80, 3.68). Leg formula 4123. Tibia width (1.46: 1.56: 1.86: 1.88). AME equal to ALE; anterior eye row almost as wide as posterior row, MOA long almost equal to front width. Maxilla fused to sternum. Semilunate groove behind spinneret. About 48 ribs on opisthosomal disc in total. Male pedipalpal balb glabrous, embolus long.

Distribution. Known only from the type locality of Chongqing, 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 5A–G. Cyclocosmia subricketti sp. nov., female holotype (B, F–G) & male paratype (A, C–E). A. Male habitus, dosal view. B. Female habitus, dorsal 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 6A–D. Cyclocosmia subricketti sp. nov. A. Female vulva, dorsal view. B. Left 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.