Ryojius fodingshanensis 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
Ryojius
Ryojius fodingshanensis

description: Ryojius fodingshanensis Irfan, Zhang & Peng, sp. n.
(佛LJƜƋĀe)
Figures 202, 203, 310
Types. Holotype ♂ (HNU–GZ– IV–1706), CHINA, Guizhou Prov.; Tongren City, Shiqian Co., Pingshan Town, Fodingshan Vill., Fodingshan NNR, 27.34899°N, 108.16272°E, 666 m, 01.XI.2017, G.C. Zhou leg. Paratypes: 1♂ 1♀, with same data as for holotype male (HNU–GZ– IV–1706).
Etymology. The specific epithet is derived from type locality; adjective.
Diagnosis. Ryojius fodingshanensis sp. n. resembles R. fanjingshanensis sp. n. in having the similar radix, lamellacharacteristicainmalepalpandstretcherofepigyne (Figs 202A–D, 203A, B; Figs 199A–D, 200A–C), but can be distinguished by at the proximal end of distal arm tip of paracymbium with knob in R. fodingshanensis sp. n. (Figs 202A–D), vs. the distal arm tip with depression in R. fanjingshanensis sp. n. (Figs 199A–D); apex of embolus finger-shaped in prolateral view in R. fodingshanensis sp. n. (Figs 202A–D), vs. forked in R. fanjingshanensis sp. n. (Figs 199A–D); dorsal tibial apophysis beak-shaped in dorsal view in R. fodingshanensis sp. n. (Figs 202A–D), vs. leaf-shaped in R. fanjingshanensis sp. n. (Figs 199A– D). The posterior margin of basal part of scape V- shaped in epigyne in R. fodingshanensis sp. n. (Figs 203A, B), vs. wave-like in R. fanjingshanensis sp. n. (Figs 200A–C).
Description. Male (holotype): Total length: 1.97. Carapace 0.91 long, 0.71 wide, yellow, cervical and radial grooves distinct. Clypeus 0.19 high. Chelicerae with five promarginal and six retromarginal teeth. Sternum longer than wide, yellow with microsetae. Eyes: AER recurved, PER straight, slightly wider. Eye sizes and interdistances: AME 0.03, ALE 0.05, PME 0.05, PLE 0.05, AME–AME 0.03, PME–PME 0.06, AME–ALE, 0.04, PME–PLE 0.07, AME–PME 0.04, ALE–ALE 0.26, PLE–PLE 0.31, ALE–PLE 0.01. Length of legs: I 2.87 (0.84, 1.01, 0.58, 0.44), II 2.57 (0.79, 0.91, 0.49, 0.38), III 2.02 (0.61, 0.67, 0.41, 0.33), IV 2.61 (0.77, 0.95, 0.53, 0.36). TmI 0.31 and TmIV absent. Tibial spine formula: 2-2-2-2. Opisthosoma 1.06 long, 0.70 wide, oval, dusky grey, posteriorly with two chevrons; ventral side dusky grey.
Palp (Figs 202A–D, 203C): Femur unmodified, almost longer than patella and tibia. Patella as long as tibia, ventrally grooved, with a long dorsal spine. Tibia conical, dorsal tibial apophysis (DTA) strongly sclerotized pointing retrolaterally in dorsal view; with one retrolateral and one dorsal trichobothria; cymbium unmodified, retrolateral margin with a shallow depression at the base; paracymbium (PC) strongly scleortized, distal arm tip with knob; distal suprategular apophysis (DSA) small covered by the tegulum with narrow hook-shaped dorsal tip. Radix (R) arch-shaped. Lamella characteristica (LC) with 2 branches extending upwardly. Terminal apophysis (TA) wide, with broad tip. Embolus (E) conspicuously large, posteriorly curved about semicircle, C-shaped, apex strongly sclerotized, finger-shaped with blunt end; thumb short covered by the terminal apophysis; embolus proper (EP) with pointed end.
Female (one of the paratypes): Total length: 1.98. Carapace 0.81 long, 0.63 wide, yellow brown, cervical and radial grooves distinct. Clypeus 0.17 high. Chelicerae with five promarginal and six retromarginal teeth. Sternum longer than wide, yellow with microsetae. Eyes: AER recurved, PER straight, slightly wider. Eye sizes and interdistances: AME 0.04, ALE 0.07, PME 0.07, PLE 0.07, AME–AME 0.02, PME–PME 0.05, AME–ALE, 0.03, PME–PLE 0.05, AME–PME 0.03, ALE–ALE 0.26, PLE–PLE 0.31, ALE–PLE 0.01. Length of legs: I 2.42 (0.71, 0.84, 0.48, 0.39), II 2.23 (0.65, 0.77, 0.45, 0.36), III 1.91 (0.61, 0.60, 0.36, 0.34), IV 2.37 (0.74, 0.81, 0.45, 0.37). TmI 0.34 and TmIV absent. Tibial spine formula: 2- 2-2-2. Opisthosoma 1.17 long, 0.79 wide, oval, dusky grey, posteriorly with two chevrons; ventral side dusky grey.
Epigyne (Figs 203A, B): Protruding; characterised by conspicuosly wide, posteriorly projecting V-shaped basal part of scape (BS), dorsally bearing narrow tongue-shaped stretcher (ST). Distal part of scape (DPS) widened posteriorly with small lateral pockects. Posterior median plate (PMP) rectangular. Spermathecae (S) globular, situates at the apeces.
Distribution. Known only from the type locality (Guizhou Province, Fig. 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 152-155, DOI: 10.11646/megataxa.15.1.1, http://zenodo.org/record/14985176