Tapinocyba denticulata Irfan, Yun, Lu-Yu & Zhi-Sheng, 2024, sp. nov.

Tapinocyba denticulata sp. nov. Figs 3, 4, 5, 12 Type material. Holotype: China • ♂; Chongqing Municipality, Jiangjin District, Simian Mountain, Zhengtian Valley, 28°36′46.97″N, 106°25′54.77″E, 1170 m a. s. l., 2023. III. 02, Wang L. Y. et al. leg.; SWUC -T-LIN-27-01. Paratypes: 1 ♀; same location data as holotype; SWUC -T-LIN-27-02 • 1 ♀: Simian Mountain, Chaoyuanguan, 28°38′53.38″N, 106°20′23.84″E, 920 m a. s. l., 2023. I. 22, Wang B. et al. leg.; SWUC -T-LIN-27-03 • 1 ♂; Simian Mountain, Qinjiagou, 28°37′6.32″N, 106°23′53.40″E, 1131 m a. s. l., 2023. III. 2, Zhang Z. G. et al. leg.; SWUC -T-LIN-27-04. Etymology. The specific epithet is derived from the Latin adjective denticulatus, meaning “ teeth ” and referring to the small teeth at the tip of dorsal tibial apophysis of the male palp. Diagnosis. The male of Tapinocyba denticulata sp. nov. resembles T. praecox (O. Pickard-Cambridge, 1873) in having the similar embolic division (Fig. 3 A – D; Hormiga 2000: fig. 27 A – E, pl. 62 A – F) and can be distinguished by the ocular region strongly curved, making right-angle with cephalothorax, extending above the clypeus in T. denticulata sp. nov. (Fig. 5 B; vs ocular region not modified); dorsal tibial apophysis as long as cymbium, tip with small teeth, extending above the cymbium in T. denticulata sp. nov. (Fig. 3 C; vs half the length of tibia, with blunt tip, extending away from cymbium); retrolateral tibial apophysis present in T. denticulata sp. nov. (Fig. 3 C; vs absent); embolus curved clockwise with bifurcated tip in T. denticulata sp. nov. (Fig. 3 A, B, E; vs slightly curved with blunt tip). The female of T. denticulata sp. nov. resembles T. affinis Lessert, 1907 in having the similar copulatory ducts and spermathecae (Fig. 4 A – E; Wiehle 1960: figs 984 a, b, 985) and can be distinguished by the tapering part of ventral plate as long as wide in T. denticulata sp. nov. (Fig. 4 A, B, E; vs somewhat triangular). The epigyne of Tapinocyba denticulata sp. nov. can be distinguished from T. praecox by the dorsal plate ventrally grooved in T. denticulata sp. nov. (Fig. 4 A – C; vs not grooved). Description. Male (holotype, Fig. 5 A – C): total length 1.74; carapace 0.87 long, 0.60 wide, brown, cephalic region slightly elevated, cephalic pits absent, fovea, cervical and radial grooves distinct. Clypeus 0.20 high. Chelicerae with five promarginal and five retromarginal teeth. Sternum yellowish brown, as long as wide, shield-like, with microsetae. Ocular region strongly curved, extending above clypeus, eyes: AER recurved, PER procurved, slightly wider than AER. Eye sizes and interdistances: AME 0.03, ALE 0.06, PME 0.04, PLE 0.05, AME – AME 0.02, PME – PME 0.07, AME – ALE, 0.02, PME – PLE 0.03, AME – PME 0.06, ALE – ALE 0.19, PLE – PLE 0.20, ALE – PLE contiguous. Length of legs: I 1.97 (0.59, 0.21, 0.48, 0.36, 0.33), II 1.82 (0.56, 0.19, 0.43, 0.35, 0.29), III 1.68 (0.58, 0.15, 0.45, 0.28, 0.22), IV 2.00 (0.58, 0.19, 0.48, 0.38, 0.39). TmI 0.63 and TmIV absent. Tibial spine formula: 1-1 - 1 - 1. Opisthosoma 0.97 long, 0.71 wide, oval, greenish. Palp (Fig. 3 A – D). Femur unmodified, almost as long as both patella and tibia. Patella as long as tibia. Tibia widest at distal end, with one retrolateral and one dorsal trichobothria, with three apophyses; dorsal tibial apophysis almost as long as cymbium, slightly curved, tip with teeth; prolateral tibial apophysis (PTA) small, somewhat triangular in dorsal view; retrolateral tibial apophysis sclerotized, tip with serrated margin; paracymbium J-shaped, basally with setae, distal arm tip with blunt end; tegulum almost round, ventrally bulging above the subtegulum, protegulum distinct, membranous; suprategulum small, with small median suprategular apophysis, distal suprategular apophysis membranous; embolic division simple, consisting of a radix longer than wide; tailpiece slightly curved with blunt tip; median membrane short, present in between embolus and distal suprategular apophysis; embolus curved, with bifurcated tip. Female (paratype SWUC -T-LIN-27-02, Fig. 5 D, E): total length 1.64; carapace 0.76 long, 0.51 wide, cephalic region slightly elevated, brown, fovea, cervical and radial grooves distinct. Clypeus 0.11 high. Chelicerae with six promarginal and five retromarginal teeth. Sternum shield-shaped, as wide as long, greenish brown, with microsetae. Eyes: AER recurved, PER straight, slightly wider than AER. Eye sizes and interdistances: AME 0.04, ALE 0.06, PME 0.04, PLE 0.05, AME – AME 0.01, PME – PME 0.04, AME – ALE, 0.01, PME – PLE 0.02, AME – PME 0.05, ALE – ALE 0.21, PLE – PLE 0.23, ALE – PLE contiguous. Length of legs: I 1.73 (0.40. 53, 0.20, 0.42, 0.30, 0.28), II 1.59 (0.50, 0.19, 0.35, 0.29, 0.26), III 1.32 (0.39, 0.16, 0.28, 0.27, 0.22), IV 1.74 (0.53, 0.16, 0.42, 0.34, 0.29). TmI 0.64 and TmIV absent. Tibial spine formula: 1-1 - 1 - 1. Opisthosoma 0.96 long, 0.64 wide, oval, greenish. Epigyne (Fig. 4 A – E). Epigynal plate twice as wide as long, anteriorly with round patch; ventral plate tapering ventrally; dorsal plate almost rectangular, with small groove at the center; copulatory opening located mid-ventrally at the junction of dorsal and ventral plates; copulatory ducts large, curving into one loop; spermathecae large and kidney-shaped, located anterior to the epigynal transverse slit, spaced by two diameters; fertilization ducts large and sinuous. Distribution. Known only from the type locality (Fig. 12).