Baiyuerius shenyunxiaoi Wei & J. Liu, 2025

Wei, Mian, Zhu, Yang, Liu, Jie, Zhang, He & Liu, Fengjie, 2025, New species and new combinations of the spider genus Baiyuerius Zhao, B. Li & S. Q. Li, 2023 (Araneae, Agelenidae, Coelotinae), Zootaxa 5636 (3), pp. 401-442 : 428-429

publication ID	https://doi.org/10.11646/zootaxa.5636.3.1
publication LSID	lsid:zoobank.org:pub:1A564430-7BA5-4159-A595-3BF3DF2F2D7A
DOI	https://doi.org/10.5281/zenodo.15561625
persistent identifier	https://treatment.plazi.org/id/24487D50-B41B-FFD0-9B91-FF10FD65FE36
treatment provided by	Plazi
scientific name	Baiyuerius shenyunxiaoi Wei & J. Liu
status	sp. nov.

Treatment

Baiyuerius shenyunxiaoi Wei & J. Liu sp. nov.

Figs 2C, D View FIGURE 2 , 23 View FIGURE 23 , 24 View FIGURE 24 , 35 View FIGURE 35

Type material. Holotype ♀ ( CBEE), CHINA: Yunnan Province: Honghe Hani and Yi Autonomous , Gejiu County, Gejia Forest Park , 23.3893°N, 103.1254°E, elevation: 2045 m, 23.VIII.2020, M. Wei leg. GoogleMaps Paratype: 1♀ ( CBEE), same data as holotype GoogleMaps .

Etymology. The specific name is dedicated to Mr. Yunxiao Shen who helped greatly with this research, noun (name) in genitive case.

Diagnosis. Females of B. shenyunxiaoi sp. nov. resemble those of B. wenshanensis sp. nov. by 1) without posterior epigynal sclerite ( Figs 23A View FIGURE 23 , 25A View FIGURE 25 ); 2) copulatory ducts straight or slightly bent outward ( Fig. 23B View FIGURE 23 , 25B View FIGURE 25 ). While in B. rotulus , posterior epigyne sclerite small but present, and with extremely long copulatory duct which folded twice (fig. 2B, C in Hoang et al. 2023). The new species can be distinguished from B. wenshanensis sp. nov. by 1) anterior hood absent ( Fig. 23A View FIGURE 23 ) [vs. present in the latter ( Fig. 25A View FIGURE 25 )]; 2) anterior margin of epigynal pocket V-shaped and weakly sclerotized ( Fig. 23A View FIGURE 23 ) [vs. M-shaped and strongly sclerotized in the latter ( Fig. 25A View FIGURE 25 )]; 3) the swollen epigyne relatively small and weakly sclerotized ( Fig. 23A View FIGURE 23 ) [vs. large and strongly sclerotized in the latter ( Fig. 25A View FIGURE 25 )]; 4) copulatory ducts bent outward ( Fig. 23B View FIGURE 23 ) [vs. straight in the latter ( Fig. 25B View FIGURE 25 )]; 5) spermathecae long and stick-shaped ( Fig. 23B View FIGURE 23 ) [vs. nearly spherical in the latter ( Fig. 25B View FIGURE 25 )].

Description. Female holotype ( Fig. 24 View FIGURE 24 ). Carapace dark brown. Cervical and radial groove distinct. Cephalic region moderately raised, lateral margin with distinct furrows. Chelicerae with three promarginal teeth and two retromarginal teeth, condyle red. Sternum longer than wide. Abdomen pale yellow, with 5 chevron-shaped patterns, covered with hairs. Legs red, metatarsi and tarsi of the first and second legs with normal hairs. Total length 14.54. Carapace 7.43 long, 5.09 wide, cephalic region 4.03 wide.Abdomen 7.11 long, 5.30 wide. Eye size and interdistance: AME 0.21, ALE 0.30, PME 0.27, PLE 0.32; AME–AME 0.17, AME–ALE 0.23, AME–PME 0.19, ALE–PLE 0.06, PME–PME 0.21, PME–PLE 0.41. Leg measurements: I 18.36 (5.10, 2.25, 4.58, 4.50, 2.41), II 16.03 (4.72, 2.16, 3.59, 3.53, 2.29), III 13.88 (4.12, 1.88, 2.70, 3.41, 1.97), IV 19.07 (5.34, 2.17, 4.45, 4.90, 2.50).

Epigyne ( Fig. 23A View FIGURE 23 ). Epigynal teeth absent. Atrium anteriorly situated, inverted-triangle-shaped. Epigynal pocket large, occupying 2/3 of epigynal plate, anterior margin V-shaped and weakly sclerotized, posterior epigynal sclerite absent, remaining area vase-shaped and membranous. Hoods deep, horizontally oriented, situated laterally below atrium.

Internal genitalia ( Fig. 23B View FIGURE 23 ). Copulatory ducts anteriorly originated, long and flat, bent outward, fused at beginning and without blind sacs. Spermathecae long and stick-shaped. Fertilization ducts posteriorly situated.

Male. unknown.

Distribution. China (Yunnan Province).