Yuelushannus baishaensis, Irfan & Zhang & Cai & Zhang, 2025

Irfan, Muhammad, Zhang, Chang-Cheng, Cai, Yu-Jun & Zhang, Zhi-Sheng, 2025, Four new species of Linyphiidae spiders (Arachnida: Araneae) from Jiangjin District of Chongqing, China, Zootaxa 5647 (5), pp. 435-450 : 446-449

Yuelushannus baishaensis sp. nov. (nüẽäe)

Figures 11–13

Type material. CHINA: Chongqing Mun., Jiangjin Dist.: Holotype ♂ (SWUC-T-LIN-37-01), Baisha Town, Zhanggong Mt., Xiannv Cave (outside of cave), 28°57′10.27″N, 106°8′57.34″E, 809 m a.s.l., 10.III.2023, Y.Q. Yao leg. Paratypes: 1♂ (SWUC-T-LIN-37-02), with same data as holotype ; 2♂ (SWUC-T-LIN-37-03~04), same locality, 5.III.2023 and 5.IV.2023, Y.Q. Yao leg. ; 1♂ (SWUC-T-LIN-37-05), Zhuyang Town, Yunwuping Forestry Centre, Guanyingou , 29°9′1.38″N, 105°57′28.18″E, 558 m a.s.l., 23.XI.2023, S.S. Qin leg. ; 2♂ (SWUC-T-LIN-37- 06~07), Dayuandong Forestry Centre, Gunziping, Longyuemen , 29°9′1.38″N, 105°57′28.18″E, 773 m a.s.l., 2023. III.5, Y. Jiang leg. ; 1♂ (SWUC-T-LIN-37-08), Dayuandong Forestry Centre, Gunziping, Jianshanzi , 28°55′46.81″N, 106°5′13.45″E, 752 m a.s.l., 2023.III.25, Y. Jiang leg.

Etymology. The specific epithet is derived from type locality; adjective.

Diagnosis. The new species can be distinguished from both congeners by the anterior radical process half shorter than embolus ( Fig. 11A; vs as long as the embolus).

Description. Male (holotype, Fig. 12A–C): total length 2.05; carapace 0.94 long, 0.83 wide, yellowish brown, cephalic lobe strongly elevated, almost as high as clypeus, square shaped in dorsal view, with distinct lateral round sulci, located posteriorly from PLE, ocular region with thick setae; cervical and radial grooves distinct, covered with sparce shallow pits; clypeus 0.23 high. Chelicerae with 5 promarginal and 4 retromarginal teeth. AER straight, PER procurved, PMEs present on cephalic lobe. Eye sizes and interdistances: AME 0.05; ALE 0.07; PME 0.08; PLE 0.07; AME–AME 0.04; PME–PME 0.09; AME–ALE 0.07; PME–PLE 0.07; AME–PME 0.15; ALE–ALE 0.32; PLE–PLE 0.34; ALE–PLE 0.01. Length of legs: I 2.54 (0.71, 0.25, 0.68, 0.54,0.36); II 2.33 (0.68, 0.25, 0.58, 0.50, 0.32); III 2.05 (0.57, 0.26, 0.45,0.46, 0.31); IV 2.70 (0.77, 0.24, 0.72, 0.63, 0.34). TmI 0.68 and TmIV 0.66. Opisthosoma oval, 1.35 long, 0.96 wide, brown, with scutum covering almost whole dorsum, with two pairs of distinct sigillae, ventral side gray.

Palp ( Fig. 11A–D). Femur unmodified, longer than both patella and tibia. Patella as long as tibia, slightly curved; tibia with 1 retrolateral and 1 dorsal trichobothrium, posterior margin with 6 retrolateral spines in row, dorsal tibial apophysis (DTA) triangular in dorsal view, with retrolateral and mesal 2 arms, densely covered with fine denticles; paracymbium hook-shaped, distal arm as long as proximal part, with slightly curved tip; subtegulum ring-shaped forming a shallow circule at the base of tegulum; tegulum (T) with long column-shaped membranous protegulum (PT), apex bifurcated; distal suprategular apophysis (DSA) with round apex, proximally with marginal suprategular apophysis (MSA) like a small projection, extending forward. Embolic division: tail piece (TP) as long as distal arm of paracymbium, tongue-like in ventral view with blunt tip, overlapping suprategulum (SPT); embolic membrane (EM) transparent tip broad, ventral margin relatively sclerotized with pointed tip; anterior radical process (ARP) 2 times shorter than embolus; embolus semicircular, with blunt tip.

Female. Unknown.

Distribution. Known only from the type localities in Jiangjin District, Chongqing ( Fig. 13).

Habitat. All of the 5 species presented here were collected from leaf litter in broad-leaved and coniferous forests in Jiangjin District, Chongqing.