Scotinotylus guizhouensis Irfan, Zhang & Peng

Irfan, Muhammad, Zhou, Gu-Chun, Peng, Xian-Jin & Zhang, Zhi-Sheng, 2025, Survey of Linyphiidae spiders (Arachnida: Araneae) from some Oriental Regions of China, Megataxa 15 (1), pp. 1-248 : 158-163

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 ).

Figures

FIGURE 208. Scotinotylus guizhouensis sp. n., male holotype. A Palp, prolateral view; B Palp, retrolateral view; C Palp, dorsal view; D Palp, ventral view. Abbreviations: DSA—distal suprategular apophysis; DTA—dorsal tibial apophysis; E—embolus; PC—paracymbium; PT—protegulum; RTA—retrolateral tibial apophysis; SPT—suprategulum; ST—subtegulum; T—tegulum; TP—tailpiece.

FIGURE 209. Scotinotylus guizhouensis sp. n., male paratype palp. A Embolic division, prolateral view; B Embolic division, ventral view; C Embolic division, posterior view. Abbreviations: DSA—distal suprategular apophysis; Em—embolus membrane; E—embolus; R—radix; SPT—suprategulum; TP—tailpiece.

FIGURE 210. Scotinotylus guizhouensis sp. n., female paratype. A, C Epigyne, ventral view; B Epigyne, lateral view; D Vulva, dorsal view. Abbreviations: CD—copulatory duct; CO—copulatory opening; DP—dorsal plate; FD—fertilization duct; S— spermatheca; SCD—scapoid; VP—ventral plate.

FIGURE 211. Scotinotylus guizhouensis sp. n., male holotype (A–C) and female paratype (D–F). A, D Habitus, dorsal view; B, E Habitus, lateral view; C, F Habitus, ventral view.

FIGURE 212. Scotinotylus longiprojectus sp. n., male holotype. A Palp, prolateral view; B Palp, retrolateral view; C Palp, dorsal view; D Palp, ventral view. Abbreviations: DSA—distal suprategular apophysis; DTA—dorsal tibial apophysis; E—embolus; PC—paracymbium; PT—protegulum; R—radix; RTA—retrolateral tibial apophysis; SPT—suprategulum; ST—subtegulum; T— tegulum; TP—tailpiece.

FIGURE 213. Scotinotylus longiprojectus sp. n., male paratype palp. A Embolic division, prolateral view; B Embolic division, ventral view; C Embolic division, retrolateral view; D Embolic division, posterior view; E Paracymbium, retrolateral view. Abbreviations: DSA—distal suprategular apophysis; E—embolus; PC—paracymbium; R—radix; SPT—suprategulum; TP— tailpiece.

FIGURE 307. Distribution of Linyphiidae species in Chongqing: 1. Bathyphantes paracymbialis Tanasevitch, 2014; 2. Diplocephalus circularis sp. n.; 3. Frontinella zhui Li & Song, 1993; 4. Gnathonarium dentatum (Wider, 1834); 5. Gongylidioides acuminatus sp. n.; 6. Gongylidioides ensis sp. n.; 7. Gongylidium uncatum sp. n.; 8. Himalaphantes azumiensis (Oi, 1979); 9. Hylyphantes graminicola (Sundevall, 1830); 10. Indophantes wushanensis Irfan, Wang & Zhang, 2023; 11. Lepthyphantes frondeus sp. n.; 12. Wulinggone qizimeiensis sp. n.; 13. Nematogmus ligulatus sp. n.; 14. Nematogmus sanguinolentus (Walckenaer, 1841); 15. Nippononeta alpina (Li & Zhu, 1993); 16. Nippononeta coreana (Paik, 1991); 17. Oia yinae sp. n.; 18. Oilinyphia xinqiaoensis sp. n.; 19. Oilinyphioides triangularis sp. n.; 20. Prosoponoides sinensis (Chen, 1991); 21. Scotinotylus guizhouensis sp. n.; 22. Sinolinyphia henanensis (Hu, Wang & Wang, 1991); 23. Syedra yuelushanensis sp. n.; 24. Ummeliata feminea (Bösenberg & Strand, 1906); 25. Ummeliata insecticeps (Bösenberg & Strand, 1906); 26. Walckenaeria sinuosa sp. n.; 27. Wuliphantes tongluensis (Chen & Song, 1988).

FIGURE 310. Distribution of Linyphiidae species in Guizhou Prov.: 1. Bathyphantes paracymbialis Tanasevitch, 2014; 2. Bifurcia ramosa (Li & Zhu, 1987); 3. Bolyphantes aculeatus sp. n.; 4. Bolyphantes arcuatus sp. n.; 5. Bolyphantes gladius sp. n.; 7. Dicristatus denticulatus sp. n.; 8. Diplocephalus tongrenensis sp. n.; 9. Diplocephaloides cucullus sp. n.; 10. Gonatium absidatum sp. n.; 11. Tapinocyba cornuta sp. n.; 12. Gongylidium demersum sp. n.; 13. Tapinocyba pingshanensis sp. n.; 14. Hylyphantes graminicola (Sundevall, 1830); 15. Nippononeta coreana (Paik, 1991); 16. Prosoponoides sinensis (Chen, 1991); 17. Ryojius fanjingshanensis sp. n.; 18. Ryojius fodingshanensis sp. n.; 19. Scotinotylus guizhouensis sp. n.; 20. Scotinotylus longiprojectus sp. n.; 21. Spelaeus cicatrix sp. n.; 6. Trematocephalus cristatus (Wider, 1834); 22. Walckenaeria asymmetrica Song & Li, 2011; 23. Walckenaeria xingdouensis sp. n..