Pimoa yadong Zhang & Li, sp. nov.

Zhang, Xiaoqing, Lan, Tianqi, Nie, Lei & Li, Shuqiang, 2020, Eight new species of the spider genus Pimoa (Araneae, Pimoidae) from Tibet, China, ZooKeys 940, pp. 79-104 : 79

Pimoa yadong Zhang & Li, sp. nov. Figures 14 , 15 , 16

Type material.

Holotype: ♂ (IZCAS-Ar40338), China, Tibet, Shigatse, Yadong County, along the way to the Qing Dynasty Customs Site, 27.42°N, 88.92°E, elevation ca. 2953 m, 6.VIII.2018, X. Zhang and J. Liu leg. Paratype: 1♀ (IZCAS-Ar40339), same data as holotype.

Etymology.

The specific name is a noun in apposition taken from the type locality.

Diagnosis.

The male of Pimoa yadong sp. nov. resembles P. nematoides Hormiga, 1994 (see Hormiga 1994a: 71, figs 285-289) and P. sinuosa Hormiga, 1994 (see Hormiga 1994a: 67, figs 256-265) but can be distinguished by the wide and subtriangular pimoid cymbial sclerite (Fig. 14B , vs. proximally wide, distally narrow and curved in P. nematoides ; vs. slender and distally blunt and curved in P. sinuosa ), by the long palpal tibia, ca. 2 times longer than the cymbium (Fig. 14A-C , vs. short tibia, ca. 1/3 of cymbial length in P. nematoides and P. sinuosa ). The female of P. yadong resembles P. sinuosa (see Hormiga 1994a: 67, figs 266-284) and P. cona sp. nov. (Fig. 2 ) but can be distinguished by a pair of nearly round spermathecae that are almost touching one another (Fig. 15A , vs. elliptic and separated spermathecae in P. cona ; vs. subtriangular and separated spermathecae in P. sinuosa ) and by the dorsal plate which extends beyond the ventral plate (Fig. 15C , vs. a dorsal plate shorter than the ventral plate in P. nematoides and P. sinuosa ).

Description.

Male (holotype): Total length 8.46. Carapace 4.04 long, 3.27 wide. Abdomen 4.42 long, 2.95 wide. Eye sizes and interdistances: AME 0.21, ALE 0.19, PME 0.18, PLE 0.20; AME-AME 0.13, AME-ALE 0.18, PME-PME 0.17, PME-PLE 0.19. Leg measurements: I: - (11.60, -, -, -); II: - (10.13, -, -, -); III: 24.42 (7.18, 7.56, 7.18, 2.50); IV: - (8.91, 9.94, 9.04, -). Habitus as in Fig. 15E . Carapace yellowish with black lateral margins; thoracic fovea and radial grooves distinct; sternum brownish. Abdomen black with slightly yellowish transverse bands. Legs brownish with black annulations, especially distinct on legs III and IV. Palp (Fig. 14A-C ): patella long, ca. 1/2 of tibial length; tibia long, ca. 2 times longer than cymbium, with several macrosetae and a dorsal process; paracymbium short, ca. 1/3 of cymbial length; pimoid cymbial sclerite wide and subtriangular, ca. 1/3 of cymbial length; cymbial denticulate process short and distally pointed, with more than five cuspules; median apophysis slender; conductor indistinct; pimoid embolic process pointed distally, almost the same length as embolus; embolus beginning at the 2:00 o’clock position; embolic tooth absent.

Female (paratype): Total length 11.86. Carapace 4.55 long, 3.85 wide. Abdomen 7.31 long, 5.38 wide. Eye sizes and interdistances: AME 0.19, ALE 0.22, PME 0.21, PLE 0.22; AME-AME 0.19, AME-ALE 0.26, PME-PME 0.24, PME-PLE 0.28. Leg measurements: I: 43.08 (11.60, 14.04, 12.82, 4.62); II: 34.30 (10.58, 8.91, 11.09, 3.72); III: 24.30 (7.44, 7.69, 6.86, 2.31); IV: - (9.42, -, -, -). Habitus as in Fig. 15F-G . Carapace yellowish with black lateral margins; thoracic fovea and radial grooves distinct; sternum brownish. Abdomen black with yellowish transverse chevron bands and vertical band not extending to the distal part. Legs brownish with black annulations, especially distinct on legs III and IV. Epigyne (Fig. 15A-D ): subtriangular; ventral plate broad, length subequal to width; dorsal plate narrowing distally, extending beyond the ventral plate; copulatory openings distinct; spermathecae round, close to each other; fertilization ducts laterally oriented.

Distribution.

Known only from the type locality, Tibet, China (Fig. 16 ).

Figures

Figure 2. Epigyne and habitus of Pimoa cona sp. nov., female paratype and male holotype A epigyne, ventral view B schematic course of internal duct system, ventral view C vulva, dorsal view D schematic course of internal duct system, dorsal view E male habitus, dorsal view F female habitus, dorsal view G female habitus, ventral view. Abbreviations: CO = copulatory opening; DP = dorsal plate of the epigyne; FD = fertilization duct; S = spermatheca; VP = ventral plate of epigyne. Scale bars: equal for F and G.

Figure 14. Left palp of Pimoa yadong sp. nov., holotype A prolateral view B ventral view C retrolateral view. Abbreviations: AS = alveolar sclerite; CDP = cymbial denticulate process; E = embolus; MA = median apophysis; P = paracymbium; PCS = pimoid cymbial sclerite; PEP = pimoid embolic process; T = tegulum. Scale bar: equal for A-C.

Figure 15. Epigyne and habitus of Pimoa yadong sp. nov., female paratype and male holotype A epigyne, ventral view B schematic course of internal duct system, ventral view C vulva, dorsal view D schematic course of internal duct system, dorsal view E male habitus, dorsal view F female habitus, dorsal view G female habitus, ventral view. Abbreviations: CO = copulatory opening; DP = dorsal plate of the epigyne; FD = fertilization duct; S = spermatheca; VP = ventral plate of epigyne. Scale bars: equal for F and G.

Figure 16. Distribution of Pimoa species from Asia. Red dots represent new species, green dots represent previously described species. 1 P. anatolica 2 P. binchuanensis 3 P. clavata 4 P. cona sp. nov. 5 P. crispa 6 P. duiba sp. nov. 7 P. gandhii 8 P. indiscreta 9 P. lata 10 P. lemenba sp. nov. 11 P. lihengae 12 P. mainling sp. nov. 13 P. nematoides 14 P. nyingchi sp. nov. 15 P. reniformis 16 P. rongxar sp. nov. 17 P. samyai sp. nov. 18 P. sinuosa 19 P. thaleri 20 P. trifurcata 21 P. wanglangensis 22 P. xinjianensis 23 P. yadong sp. nov.