Otacilia xueshanensis sp. nov. (Ḣ山Þffifl)

Figs 10G–H, 17, 18

Type material. Holotype ♂: CHINA: Guizhou Province: Bijie City, Weining Yi and Hui and Miao Autonomous County, Xueshan Town, Xueshan Reservoir (27°03.90′N, 104°06.34′E, 2423 m elev.), 19Aug. 2017, leg. Yannan Mu.

Paratypes: 2♀, same data as holotype .

Etymology. The species name is derived from the type locality; adjective.

Diagnosis. This new species resembles O. submicrostoma Jin, Fu, Yin & Zhang, 2016 by having a similarly shaped FA, transverse and slender embolus, and similar bulb (see Fig. 17A, C and fig. 11A, C in Jin et al. 2016), but males can be distinguished by the thin RTA and a small and obvious apophysis present at the prolateral base of the RTA (vs wide RTA without basal apophysis, compare Figs 17B–D, 18B–D and figs 11D, 12C in Jin et al. 2016). Females can be distinguished by the thin median septum (vs without median septum, compare Fig. 18E with fig. 12D in Jin et al. 2016) and the compact, closely situated copulatory openings, copulatory ducts and connecting tube (vs loose and clearly separated, compare Fig. 17E–F and fig. 11E–G in Jin et al. 2016).

Description. Male: holotype (Fig. 10G): total length 2.81, carapace 1.51 long, 1.32 wide (CW); abdomen 1.31 long, 0. 89 wide. Eye sizes and interdistances: AME 0.09, ALE 0.09, PME 0.08, PLE 0.09; AME–AME 0.05, AME–ALE 0.01, ALE–ALE 0.22, PME–PME 0.13, PME–PLE 0.07, PLE–PLE 0.38, ALE–PLE 0.10. Eye area 0.51 wide (EAW), cephalic region 0.71 wide (CRW), EAW/CRW 0.72. CRW/CW 0.54. MOA 0.22 long, anterior width 0.20, posterior width 0.27. Clypeal height 0.15 (CH), CH /AME 1.67. Chelicerae with three promarginal and six retromarginal teeth. Carapace yellow, with broad black ring around margin of carapace. Abdomen oval, gray, with large rectangular dorsal scutum anteriorly, two irregular black spots at middle area, one black chevron marking and three transverse stripes posteriorly (Fig. 10G).

Palp as in Figs 17A–D, 18A–D. FA high, located at anterior of femur. PTA sclerotized, tip round (Figs 17A, 18A). RTA thin, long and straight, with small apophysis prolaterally at base of RTA (Figs 17B, 18B). Tegulum oval, wider than cymbium. Tegulum apophysis large, triangular. Sperm duct tapering to embolus. Embolus slender, transverse. Conductor absent.

Female (Fig. 10H): total length 3.95–4.24 (n=2). One paratype total length 3.95, carapace 1.64 long, 1.49 wide (CW); abdomen 2.31 long, 1.57 wide. Eye sizes and interdistances: AME 0.11, ALE 0.10, PME 0.09, PLE 0.11; AME – AME 0.03, AME – ALE 0.01, ALE – ALE 0.24, PME – PME 0.11, PME – PLE 0.05, PLE – PLE 0.40, ALE – PLE 0.10. Eye area 0.53 wide (EAW), cephalic region 0.77 wide (CRW), EAW/CRW 0.69. CRW/CW 0.52. MOA 0.26 long, anterior width 0.22, posterior width 0.30. Clypeal height 0.13 (CH), CH / AME 1.18. Carapace dark brown, with broad black ring around margin of carapace, and hand-shaped brown pattern at middle part around fovea. Abdomen gray, without dorsal scutum, anterior black, two triangular black spots at middle area, four chevron stripes posteriorly (Fig. 10H) .

Epigyne as in Figs 17E–F, 18E–F. Epigynal plate longer than wide. Median septum extremely thin, crack-like. Copulatory openings small, with wing-shaped copulatory plug (Figs 17E). Copulatory ducts short and thick, close to each other and slightly separated at posterior part. Connecting tube thin, strongly curved. Bursa oval, transparent. Spermathecae oval, transverse, close to each other. Fertilization ducts located at anterior of spermathecae.

Measurements of legs:

Distribution. China (Guizhou Province).