Syedra yuelushanensis 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
Syedra
Syedra yuelushanensis

description: Syedra yuelushanensis Irfan, Zhang & Peng, sp. n.
(ḂḆƜĦe)
Figures 235–237, 307, 314, 315
Types. Holotype ♂, CHINA, Hunan Prov.: Changsha City, Yuelu District, Yuelu Mountain, 28.19012°N, 112.94269°E, 141 m, 06.XI.2016, M. Irfan & G.C. Zhou leg. Paratypes: 2♂ 2♀, with same data as for holotype male; 7♀, Changde City, Taoyuan Co., Shaping Town, Saiyang Vill., Wuyunjie NNR, 28.60443°N, 110.15544°E, 209 m, 06.VIII.2017, X.J. Peng et al. leg. (HNU–HN– IV–1734); 1♂, Changde City, Taoyuan Co., Shaping Town, Saiyang Vill., Wuyunjie NNR, 28.61471°N, 110.40767°E, 208 m, 06.VIII.2017, X.J. Peng et al. leg. (HNU–HN– IV–1736); 3♀, Ningxiang Co., Huaminglou Town, Tanzi Vill., 28.032005°N, 112.640872°E, 72 m, 09.V.2017, G.C. Zhou et al. leg. (HNU–HN– IV– 1718); 2♀, Ningxiang Co., Huaminglou Town, Jinyuan Vill., 28.1002°N, 112.5277°E, 187 m, 24.X.2017, G.C. Zhou leg. (HNU–HN– IV–1755); 1♀, Ningxiang Co., Huaminglou Town, Yanglin Vill., 28.10020°N, 112.65881°E, 189 m, 10.V.2017, G.C. Zhou et al. leg. (HNU–HN– IV–1707); Chongqing: 2♂ 10♀, Youyang Co., Taohuayuan Scenic Spot, 28.85096°N, 108.75037°E, 995 m, 23.VII.2017, M. Irfan & G.C. Zhou leg. (HNU–CQ– IV–1718); 4♀, Youyang Co., Xiaoba Town, Xinqiao Vill., 28.83778°N, 108.72372°E, 924 m, 23.V.2017, G.C. Zhou et al. leg. (HNU–CQ– IV– 1714); 4♀, Youyang Co., Xiaoba Town, Xinqiao Vill., 28.83698°N, 108.72222°E, 933 m, 22.VII.2017, M. Irfan & G.C. Zhou leg. (HNU–CQ– IV–1716); Hubei Prov.: 1♀, Enshi Co., Huangjindong Town, Maliuxi Vill., 29.95240°N, 109.01717°E, 785 m, 25.VIII.2017, G.C. Zhou et al. leg. (HNU–HB– IV–1727).
Etymology. This specific species name derived from the type locality; adjective.
Diagnosis. Sydera yuelushanensis sp. n. resembles S. oii (Figs 235A–D, 236A–C; Yin et al., 2012, figs 267a–d), but can be distinguished by the tip of lamella characteristica notched in S. yuelushanensis sp. n. (Figs 235A–C; vs. hook-shaped); ventral part of pit hook relatively broad and dorsal tip with blunt end in S. yuelushanensis sp. n. (Figs 235A–C; vs. ventral part narrow and dorsal tip with pointed end). Spermathecae 9-shaped in S. yuelushanensis sp. n. (Figs 236A–C; vs. apical part not curved).
Description. Male (holotype, Figs 237A–C): Total length: 1.65. Carapace: 0.71 long, 0.58 wide, orange to yellowish, cephalic region slightly elevated, outline concave, cervical and radial grooves distinct. Clypeus 0.16 high. Chelicerae with three promarginal and three retromarginal teeth.Sternum longer than wide, yellow with microsetae. Eyes: AER recurved, PER straight, slightly wider than AER. PMEs head–light shaped, relatively large. Eye sizes and interdistances: AME 0.03, ALE 0.06, PME 0.07, PLE 0.06, AME–AME 0.02, PME–PME 0.03, AME–ALE, 0.03, PME–PLE 0.01, AME–PME 0.05, ALE–ALE 0.22, PLE–PLE 0.23, ALE–PLE contiguous. Length of legs: I 2.85 (0.75, 0.92, 0.65, 0.53), II 2.55 (0.68, 0.81, 0.58, 0.48), III 2 (0.53, 0.64, 0.47, 0.36), IV 2.82 (0.76, 0.91, 0.68, 0.47). Tibial spine formula: 2-2-2- 2. TmI 0.53 and TmIV 0.52. Opisthosoma 0.94 long, 0.56 wide, oval, dusky grey, mid dorsally with black pattern extending to lateral sides; ventral side grey.
Palp (Figs 235A–C): Femur unmodified, almost longer than patella and tibia. Patella shorter than tibia, dorsally with long thick spine. Tibia with two retrolateral and one dorsal trichobothria; cymbium with a shallow depression at proximal end; paracymbium (PC) U-shaped, distal arm tip notched and with setae on proximal part. Pit hook (PH) relatively large,ventral part broad and dorsal tip sclerotized, with blunt end. Radix (R) longer than wide, with Fickert’s gland (fg); lamella characteristica (LC) longer than wide with bifurcated tip; terminal apophysis (TA) tip sharp with pointed end. Embolus (E) slightly curved with pointed end attached with round thumb (TH).
Female (one of paratype, Figs 237C–F): Total length: 2.06. Carapace: 0.72 long, 0.59 wide, yellow, cephalic region slightly elevated,cervical and radial grooves distinct. Clypeus 0.17 high. Chelicerae with three promarginal and three retromarginal teeth. Sternum longer than wide, yellowish green with microsetae. Eyes: AER recurved, PER straight, slightly wider than AER. PMEs head–light shaped, relatively large. Eye sizes and interdistances: AME 0.04, ALE 0.07, PME 0.07, PLE 0.06, AME–AME 0.03, PME–PME 0.03, AME–ALE, 0.02, PME–PLE 0.01, AME–PME 0.04, ALE–ALE 0.23, PLE–PLE 0.25, ALE– PLE contiguous. Length of legs: I 3.19 (0.91, 1.01, 0.76, 0.51), II 2.75 (0.75, 0.89, 0.62, 0.49), III 2.38 (0.67, 0.75, 0.49, 0.47), IV 2.99 (0.88, 0.94, 0.66, 0.51). Tibial spine formula: 2-2-2-2. TmI 0.63 and TmIV 0.54. Opisthosoma 1.34 long, 0.92 wide, oval, pale, posteriorly with black band around spinnerets, densely covered with fine setae.
Epigyne (Figs 236A–C): Ventral plate (VP) wider than long, copulatory openings (CO) present antero– ventrally; dorsal plate (DP) rectangular; copulatory ducts (CD) form long loop; spermathecae (S) 9-shaped, spaced by two times more width of spermathecae. Fertilization ducts (FD) long, extending mesally.
Distribution. Known only from the type localities (Chongqing, Hubei and Hunan Provinces, Figs 307, 314, 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 180-182, DOI: 10.11646/megataxa.15.1.1, http://zenodo.org/record/14985176