Baiyuerius digitus 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 : 425-426

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.15561619
persistent identifier	https://treatment.plazi.org/id/24487D50-B418-FFD5-9B91-FA02FD67FD3A
treatment provided by	Plazi
scientific name	Baiyuerius digitus Wei & J. Liu
status	sp. nov.

Treatment

Baiyuerius digitus Wei & J. Liu sp. nov.

Fig. 1D View FIGURE 1 , 21 View FIGURE 21 , 22 View FIGURE 22 , 35 View FIGURE 35

Type material. Holotype ♂ ( CBEE), CHINA: Yunnan Province: Kunming City, Xishan Mountain , 24.9508°N, 102.6327°E, elevation: 2300 m, 17.Ⅹ Ⅰ.2019, J. Chen, J. Liu, Z.C. Li and B. Liang leg. GoogleMaps

Etymology. The specific name is derived from Latin word “digitus ”, meaning finger-liked, referring to the shape of embolic tip; adjective.

Diagnosis. Males of Baiyuerius digitus sp. nov. resemble those of B. zhuping , see description of digitus- speceis group. And can be distinguished from the latter by 1) patellar apophysis short and bent backward, retrolateral tibial apophysis short, approximately 1/2 the length of tibia ( Fig. 21C View FIGURE 21 ) [vs. patellar apophysis long and straight, retrolateral tibial apophysis subequal to tibia in B. zhuping (fig. 5C in Zhao et al. 2023)]; 2) ventral margin of conductor serrated, and dorsal apophysis sclerotized ( Fig. 21B View FIGURE 21 ) [vs. ventral margin smooth in B. zhuping , with dorsal apophysis membranous (fig. 5B in Zhao et al. 2023)]; 3) embolus thick, prism-shaped, and distal part with a large triangular ventral slice ( Fig. 21B View FIGURE 21 ) [vs. obviously acuminate, and with a small triangular dorsal slice situated near the last 1/3 of embolus in B. zhuping (fig. 21B in Zhao et al. 2023)].

Description. Male holotype ( Fig. 22 View FIGURE 22 ). Carapace yellow, cervical and radial grooves distinct, covered with long and dense hairs. Cephalic region moderately raised, lateral margin with furrows. Chelicerae with three promarginal teeth and two retromarginal teeth. Sternum longer than wide.Abdomen gray, with 5 chevron-shaped patterns, covered with long and dense hairs. Legs brown, covered with long and dense hairs. Total length 10.13. Carapace 5.67 long, 3.65 wide, cephalic region 2.82 wide. Abdomen 4.46 long, 3.27 wide. Eye size and interdistance: AME 0.19, ALE 0.20, PME 0.20, PLE 0.26; AME–AME 0.12, AME–ALE 0.13, AME–PME 0.14, ALE–PLE 0.07, PME–PME 0.11, PME–PLE 0.26. Leg measurements: Leg I 13.81 (3.92, 1.65, 3.27, 3.46, 1.86), leg II 12.42 (3.49, 1.47, 2.86, 3.16, 1.70), leg III 10.09 (2.92, 1.31, 1.88, 2.63, 1.56), leg IV 13.58 (3.80 + 1.57 + 3.05 + 3.76 + 1.53).

Palp ( Fig. 21 View FIGURE 21 ). Patellar apophysis short and thin, bent backward. Retrolateral tibial apophysis subequal to 1/2 the length of tibia, with distal tip extended beyond tibia. Lateral tibial apophysis small and blunt. Cymbial furrow less than 1/2 the length of cymbium, with distinct dorsal margin. Conductor crescent shaped, ventral margin serrated, dorsal margin slightly sclerotized but without process; dorsal apophysis of conductor small but sclerotized. Embolus long and strong, prism-shaped, with a large triangular ventral slice near distal tip, embolic base large, nearly perpendicular to the bulb plane. Median apophysis human-ear-shaped, with a small basal process.

Female. Unknown.

Distribution: China (Yunnan Province).