Pimoa yajiangensis, Irfan & Wang & Zhao & Zhang, 2022

Irfan, Muhammad, Wang, Lu-Yu, Zhao, Jingxia & Zhang, Zhi-Sheng, 2022, Three new species of the spider genus Pimoa Chamberlin & Ivie, 1943 (Araneae, Pimoidae) from Qinghai-Tibet Plateau of China, Zootaxa 5092 (3), pp. 318-330 : 324-325

Pimoa yajiangensis new species

Figures 4A, B , 7C , 8

Type material. Holotype: female, China, Sichuan, Yajiang County, Xiangkezong , 29°59′16″N, 100°55′14″E, elev. 3424 m, 14 June 2018, L.Y. Wang, Z.S. Wu and Y.N. Mu leg. (SWUC-T-PI-04-01).

Etymology. The specific name refers to the type locality.

Diagnosis. Pimoa yajiangensis n. sp. resembles P. reniformis Xu & Li, 2007 ( Xu & Li 2007: 493, figs 42–47) in having similar dorsal and ventral plates, which become narrow posteriorly and having an oval mark on the dorsal plate. However, the new species can be distinguished from all other Pimoa species by a heart-shaped epigynal ventral plate and the copulatory ducts with two turns directed dorso-ventrally before entering the spermathecae ( Fig. 4A, B ).

Description. Female (holotype, Fig. 7C ): Total length 10.24. Carapace 4.10 long, 3.09 wide. Abdomen 6.84 long, 5.64 wide. Eye sizes and interdistances: AME 0.22, ALE 0.21, PME 0.21, PLE 0.22; AME–AME 0.16, AME– ALE 0.19, PME–PME 0.18, PME–PLE 0.24. Carapace brownish with black lateral margins; thoracic fovea and radial grooves distinct; sternum brownish. Abdomen black with yellowish transverse chevron bands. Legs brownish with black annulations. Leg measurements: I: 21.16 (6.23, 7.08, 5.42, 2.43); II: 19.07 (5.62, 6.33, 4.87, 2.25); III: 14.14 (4.32, 4.44, 3.62, 1.76); IV: 18.56 (5.67, 6.17, 4.73, 1.99).

Epigynum ( Fig. 4A, B ): heart-shaped; ventral and dorsal plates posteriorly narrow; copulatory openings distinct; Copulatory ducts with two turns and not fused; spermathecae round, touching each other; fertilization ducts oriented laterally.

Male. Unknown.

Distribution. Known only from the type locality, Sichuan, China ( Fig. 8 ).

Figures

FIGURE 4. Pimoa yajiangensis n. sp., female holotype. A, Epigynum, ventral view; B, Vulva, dorsal view. Scale bars, A, B, 0.5 mm.

FIGURE 7. Habitus of Pimoa spp., dorsal view.A, Male holotype of P. pingwuensis n. sp.; B, Female paratype of P. pingwuensis n. sp.; C, Female holotype of P. yajiangensis n. sp.; D, Male holotype of P. zekogensis n. sp. Scale bars, A–D, 2 mm.

FIGURE 8. Distribution of the four new Pimoa species described here.