Oia baiyunensis Irfan, Zhang & Peng, sp. n.
Creators: name: Irfan, Muhammad
name: Zhou, Gu-Chun
name: Peng, Xian-Jin
name: Zhang, Zhi-Sheng
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Oia
Oia baiyunensis

description: Oia baiyunensis Irfan, Zhang & Peng, sp. n.
(Ɵ云伊亚e)
Figures 169–171, 315
Types. Holotype ♂ (HNU–HN– IV–1715), CHINA, Hunan Prov.: Xiangxi, Baojing Co., Maogou Town, Baiping Vill., Baiyun MNNR, 28.61789°N, 109.40585°E, 298 m, G.C. Zhou et al. leg. Paratypes: 1♀, with same data as for holotype (HNU–HN– IV–1715).
Etymology. The specific epithet is derived from the type locality; adjective.
Diagnosis. Oia baiyunensis sp. n. resembles O. imadatei in having similar thick, robust spine in male palp and ventral plate in epigyne in female (Figs 169A– D, 170A–D; Lv et al. 2015, figs 2A–E), but can be distinguished by the dorsal tibial apophysis short with broad distal end in O. baiyunensis sp. n. (Figs 169A–C; vs. two times longer than tibial apophysis of O. baiyunensis sp. n.); distal end of embolus relatively thick in O. baiyunensis sp. n. (Figs 169A, D; vs. filiform); copulatory openings present mid ventrally lower to anterior margin of epigynal plate in O. baiyunensis sp. n. (Figs 170A–D; vs. present mid ventrally at the anterior margin of epigynal plate); spermathecae kidney-shaped in O. baiyunensis sp. n. (Figs 170A–D; vs. round).
Description. Male (holotype, Figs 171A, B): Total length: 1.38. Carapace 0.61 long, 0.45 wide, yellow, cephalic region elevated, ocular quad triangular, mid dorsally with three setae, cervical and radial grooves distinct. Clypeus 0.16 high. Chelicerae with five promarginal and five retromarginal teeth. Sternum longer than wider, yellowish grey with microsetae. Eyes: AER recurved, PER slightly recurved, wider than AER. Eye sizes and interdistances:AME 0.02, ALE 0.04, PME 0.03, PLE 0.04, AME–AME 0.01, PME–PME 0.01, AME– ALE, 0.01, PME–PLE 0.01, AME–PME 0.04, ALE–ALE 0.12, PLE–PLE 0.14, ALE–PLE contiguous. Length of legs: I 1.44 (0.44, 0.50, 0.24, 0.26), II 1.31 (0.39, 0.44, 0.23, 0.25), III 1.11 (0.34, 0.36, 0.20, 0.21), IV 1.43 (0.45, 0.49, 0.26, 0.23). TmI present and TmIV absent. Tibial spine formula: 1-1-1-1. Opisthosoma 0.77 long, 0.46 wide, oval, yellow.
Palp (Figs 169A–D): Femur unmodified, as long as both patella and tibia. Patella one and half times longer than tibia. Tibia mid dorsally with a thick, robust spine, with one retrolateral trichobothria, dorsal tibial apophysis (DTA) sclerotized, with beak-shaped in prolateral view with pointed end; cymbium unmodified, globular in ventral view; paracymbium (PC) C-shaped; distal suprategular apophysis (DSA) robust, proximally with small tooth. Median membrane (MM) arises from the ventral side of the radix, broad, oval, extending upward; embolus (E) long, thick, sclerotized, arises at 6 o’clock, slightly extending above the cymbium.
Female (one of paratype, Figs 171C, D): Total length: 1.23.Carapace0.58long,0.42wide, yellow,cephalicregion elevated, ocular quad triangular, mid dorsally three setae, cervical and radial grooves distinct. Clypeus 0.16 high. Chelicerae with five promarginal and six retromarginal teeth. Sternum longer than wider, yellowish grey with microsetae. Eyes: AER recurved, PER procurved, slightly wider than AER. Eye sizes and interdistances: AME 0.02, ALE 0.04, PME 0.03, PLE 0.04, AME–AME 0.02, PME– PME 0.01, AME–ALE, 0.01, PME–PLE 0.01, AME– PME 0.04, ALE–ALE 0.15, PLE–PLE 0.17, ALE–PLE contiguous. Length of legs: I 1.22 (0.38, 0.41, 0.21, 0.22), II 1.16 (0.37, 0.39, 0.20, 0.20), III 0.95 (0.31, 0.28, 0.18, 0.18), IV 1.19 (0.37, 0.40, 0.21, 0.21). TmI present and TmIV absent. Tibial spine formula: 1-1-1-1. Opisthosoma 0.76 long, 0.43 wide, oval, yellow.
Epigyne (Figs 170A–D): Ventral plate (VP) longer than wide, posterior end round; copulatory opening (CO) present anteriorly on ventral plate; copulatory ducts (CD) long, sinuous; spermathecae (S) present dorso-laterally at the anterior end of epigyne; fertilization ducts (FD) small, extending mesally.
Distribution. Known only from the type locality (Hunan Province, Fig. 315).
description: Published as part of Irfan, Muhammad, Zhou, Gu-Chun, Peng, Xian-Jin & Zhang, Zhi-Sheng, 2025, Survey of Linyphiidae spiders (Arachnida: Araneae) from some Oriental Regions of China, pp. 1-248 in Megataxa 15 (1) on pages 128-130, DOI: 10.11646/megataxa.15.1.1, http://zenodo.org/record/14985176