Lathys spiralis Zhang, Hu & Zhang, 2012, sp. nov.

Lathys spiralis sp. nov.

Figs 4A–B, 5 A–H, 14

Type material. Holotype: Female, China, Shaanxi Province, Zhouzhi County, Houzhenzi Town, under stone or leaf litter, 33°50'50ʺ N, 107°50'0ʺ E, 1 May 2010, Z.X. Li, K.Y. Xu & L.Y. Wang leg. (SWUC). Paratypes: 2 females, same data as holotype (SWUC); 1 female, Chongqing Municipality, Jinyun Mountain, 29°50ʹ30.5ʺN, 106°21ʹ31.1ʺE, Guankou, under stone or leaf litter, 5 April 2010, Z.S. Zhang, Z.X. Li, K.Y. Xu & L.Y. Wang leg. (SWUC); 7 females, Jinyun Mountain, Baizigou, 17 April 2010, Z.X. Li leg. (SWUC); 1 female, Baizigou, 24 April 2010, Z.X. Li, K.Y. Xu & L.Y. Wang leg. (SWUC); 2 females, Baizigou, 16 April 2008, Z.S. Zhang leg. (SWUC).

Etymology. The specific name is derived from the Latin word ‘ spiralis ’, meaning ‘spiraled’ and refers to the spiraled copulatory ducts of the epigyne; adjective.

Diagnosis. Female of the new species is similar to those of L. humilis- group species, L. humilis, L. nielseni, L. bin (Marusik & Logunov, 1991: 92, figs 3.7–9) and L. subhumilis sp. nov. (Figs 9D–E, 11G–H), but can be distinguished from the others by the visible and long inner margins of copulatory openings, the relatively long and looped copulatory ducts and the big spermathecae (Figs 4A–B, 5G–H).

Description. Female total length 1.58–2.29. Holotype (Figs 5A–E) total length 2.01. Prosoma 0.93 long, 0.75 wide; opisthosoma 1.30 long, 0.99 wide. AME smallest, ALE largest. Eye sizes and interdistances: AME 0.02, ALE 0.08, PME 0.07, PLE 0.08; AME–AME 0.04, AME–ALE 0.03, PME–PME 0.07, PME–PLE 0.07, ALE–PLE 0.03. MOA 0.17 long, front width 0.09, back width 0.17. Clypeus height 0.04. Chelicerae with 4 promarginal and 5 retromarginal teeth. Calamistrum of metatarsus IV relatively short. Leg measurements: I 2.62 (0.78, 0.93, 0.55, 0.36); II 2.12 (0.65, 0.71, 0.44, 0.32); III 1.83 (0.58, 0.58, 0.40, 0.27); IV 2.37 (0.75, 0.79, 0.53, 0.30). Leg formula: 1423.

Epigyne (Figs 4A–B, 5G–H). Inner margins of copulatory openings visible. Copulatory ducts spiraled around the copulatory openings and spermathecae, forming two loops. Spermathecae ball-like, relatively big, with slightly wider distance than their diameter.

Male unknown.

Distribution. China (Shaanxi and Chongqing) (Fig. 14).