Scotinotylus guizhouensis 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
Scotinotylus
Scotinotylus guizhouensis

description: Scotinotylus guizhouensis Irfan, Zhang & Peng, sp. n.
(áhȁ头e)
Figures 208–211, 307, 310
Types. Holotype ♂ (HNU–GZ– IV–1715), CHINA, Guizhou Prov.: Tongren City, Songtao Co., Wuluo Town, Taohuayuan Vill., Fanjingshan NNR, 28.00130°N, 108.80578°E, 1160 m, 06.XI.2017, G.C. Zhou leg. Paratypes: 11♂ 17♀, with same data as for holotype male (HNU–GZ– IV–1715); Chongqing: 2♀, Pengshui Co., Mowei MSS, 29.16079°N, 108.03732°E, 1564 m, 26.VII.2017, M. Irfan & G.C. Zhou leg. (HNU–CQ– IV–1723); 1♀, Pengshui Co., Mowei MSS, 29.19612°N, 108.04788°E, 1458 m, 26.VII.2017, M. Irfan & G.C. Zhou leg. (HNU–CQ– IV–1724).
Etymology. The specific epithet is derived from the type locality; adjective.
Diagnosis. Scotinotylus guizhouensis sp. n. resembles S. longiprojectus sp. n. and S. vettonicus in having the similar tegulum and the embolic division (Figs 208A– D, 209A–C; Figs 212A–D, 213A–E; Barrientos et al. 2020, figs 2e–g, 3a–b), but can be distinguished by the paracymbium J-shaped in S. guizhouensis sp. n. (Figs 208A–D, 209A–C), vs. basal part of the paracymbium with long projection, hook-shaped pointed end and almost reaches to the proximal end of the tibia in retrolateral view in S. longiprojectus sp. n. (Figs 212A–D, 213E), C-shaped in S. vettonicus; the distal suprategular apophysis long, tongue-shaped, protruding above the embolic membrane in S. guizhouensis sp. n. (Figs 208A, B, 209A–C), vs. small, retained below the embolic membrane in S. longiprojectus sp. n. (Figs 212A, B, C, 213A–D), absent in S. vettonicus; retrolateral tibial apophysis present in S. guizhouensis sp. n. (Figs 208B, C), vs. absent in S. longiprojectus sp. n. (Figs 212B, C). Female resembles those of S. majesticus and S. vettonicus in having the epigyne with long tongue-shaped scapoid on anterior margin (Figs 210A–D; Millidge, 1981, figs 85, 87; Barrientos et al. 2020, figs 2c–d), and can be distinguished by the copulatory ducts forming large broad loop extending anteriorly and than turn back to spermathecae in S. guizhouensis sp. n. (Figs 210C, D; vs. forming long broad loop posteriorly in S. majesticus; not forming long loop in S. vettonicus); spermathecae present posteriorly on epigynal plate in S. guizhouensis sp. n. (Figs 210A, D; vs. present anteriorly both in S. majesticus and S. vettonicus).
Description. Male (holotype, Figs 211A–C): Total length: 1.93. Carapace 0.89 long, 0.67 wide, brown, cephalic region strongly elevated, cephalic pits present behind PLEs, cervical and radial grooves distinct. Clypeus 0.24 high. Chelicerae with five promarginal and six retromarginal teeth. Sternum longer than wide, yellowish brown with microsetae. Eyes: AER recurved, PME procurved. Eye sizes and interdistances: AME 0.04, ALE 0.07, PME 0.07, PLE 0.05, AME–AME 0.01, PME–PME 0.06,AME–ALE, 0.03, PME–PLE 0.03,AME–PME 0.07, ALE–ALE 0.26, PLE–PLE 0.29, ALE–PLE contiguous. Length of legs: I 2.40 (0.74, 0.79, 0.48, 0.39), II 2.26 (0.71, 0.74, 0.47, 0.34), III 1.89 (0.56, 0.62, 0.41, 0.30), IV 2.38 (0.69, 0.83, 0.52, 0.34). Tibial spine formula: 2-2- 1-1. TmI 0.38 and TmIV absent. Opisthosoma 1.05 long, 0.71 wide, oval, grey, densely covered with fine spines.
Palp (Figs 208A–D, 209A–C): Femur unmodified, almost longer than patella and tibia. Patella one and half times longer than tibia, ventrally grooved. Tibia with one reterolateral and one dorsal trichobothria, retrolateral tibial apophysis (RTA) somewhat triangular; dorsal tibial apophysis (DTA) long, slightly curved, with pointed end in dorsal view; cymbium unmodified, broad at distal end; paracymbium (PC) sclerotized, J-shaped; tegulum (T) ventrally with finger like projection in ventral view; protegulum (PT) broad, membranous, with blunt tip protruding upward; distal suprategular apophysis (DSA) sclerotized, slightly curved, distal end membranous. Tailpiece (TP) of embolic division sclerotized, curved with blunt tip; embolic membrane (EM) running parallel with embolus. Embolus (E) long, sclerotized, coiled, almost forming a complete transverse circle.
Female (paratype, Figs 211D–F): Total length: 1.92. Carapace 0.85 long, 0.66 wide, brown, cephalic region slightly elevated, cervical and radial grooves distinct. Clypeus 0.27 high. Chelicerae with five promarginal and six retromarginal teeth. Sternum longer than wide, yellow with microsetae. Eyes: AER recurved, PME procurved. Eye sizes and interdistances: AME 0.04, ALE 0.07, PME 0.06, PLE 0.06, AME–AME 0.02, PME–PME 0.05, AME–ALE, 0.02, PME–PLE 0.04, AME–PME 0.07, ALE–ALE 0.26, PLE–PLE 0.28, ALE–PLE contiguous. Length of legs: I 2.34 (0.73, 0.80, 0.46, 0.35), II 2.08 (0.64, 0.72, 0.38, 0.34), III 1.71 (0.53, 0.56, 0.34, 0.28), IV 2.29 (0.72, 0.80, 0.44, 0.33). Tibial spine formula: 2-2- 1-1. TmI 0.36 and TmIV absent. Opisthosoma 1.07 long, 0.77 wide, oval, grey, densely covered with fine spines.
Epigyne (Figs 210A–D): Ventral plate (VP) rectangular in outline; copulatory opening (CO) present poseriorly at the junction of dorsal and ventral plates; copulatory ducts (CD) long, sinuous; dorsal plate (DP) partly visible in ventral view. Scapoid (SCD) originates mid-anteriorly, longer than wide, tongue shaped with blunt end. Spermathecae (S) present near the posterior laterally on dorsal plate. Fertilization ducts (FD) short extending mesally.
Distribution.Known from type localities (Chongqing and Guizhou Province, Figs 307, 310).
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 158-163, DOI: 10.11646/megataxa.15.1.1, http://zenodo.org/record/14985176