Baiyuerius shaanensis 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 : 418-420

Baiyuerius shaanensis Wei & J. Liu sp. nov.

Figs 2A, B , 15 , 16 , 35

Type material. Holotype ♀ ( CBEE), CHINA: Shaanxi Province: Hanzhong City, Mian County, Dingjun Mountain , 33.1133°N, 106.6661°E, elevation: 803 m, 26.Ⅰ.2023, H.C. Hu & K. Yu leg. ; Paratype: ♀ ( CBEE), same data as holotype .

Etymology. The specific name is derived from the type locality, Shaanxi Province; adjective.

Diagnosis. Females of Baiyuerius shaanensis sp. nov. resemble those of B. imitatus sp. nov., and can be easily distinguished from the latter, see in diagnosis of B. imitates sp. nov. for detailed statement.

Description. Female holotype ( Fig. 16 ). Carapace dark brown. Cervical and radial groove distinct. Cephalic region dark and extremely raised, lateral margin with distinct furrows. Chelicerae with three promarginal teeth and two postmarginal teeth, condyle red. Sternum longer than wide. Abdomen gray, with 6 chevron-shaped patterns, covered by hairs. Legs reddish brown, metatarsi and tarsi of the first and second legs with normal hairs. Total length 12.56. Carapace 6.56 long, 4.41 wide, cephalic region 3.88 wide. Abdomen 6.94 long, 5.09 wide. Eye size and interdistance: AME 0.25, ALE 0.30, PME 0.27, PLE 0.33; AME–AME 0.08, AME–ALE 0.19, AME–PME 0.21, ALE–PLE 0.05, PME–PME 0.11, PME–PLE 0.39. Leg measurements: I 14.60 (4.25, 1.78, 3.66, 3.27, 1.92), II 12.92 (3.77, 1.70, 3.12, 2.99, 1.79), III 10.39 (3.11, 1.48, 2.19, 2.46, 1.42), IV 14.98 (4.44, 1.73, 3.31, 3.89, 1.71).

Epigyne ( Fig. 15A ). Epigynal teeth long. Atrium guitar-pick-shaped. Epigynal pocket large and sclerotized, with furrows on surface, anterior margin sclerotized. Posterior epigynal sclerite distinct. Hoods situated laterally of atrium. Copulatory opening situated centrally.

Internal genitalia ( Fig. 15B ). Copulatory ducts short, with elongate and curved blind sacs. Spermathecae small, with the posterior part most close to each other, spermathecal heads nearly invisible. Fertilization ducts short, situated posteriorly.

Male. Unknown.

Distribution. China (Shaanxi Province).

Figures

FIGURE 2. Epigynes and internal genitals of Baiyuerius spp. from two species groups. A, B Baiyuerius shaanxiensis sp. nov. from chongzu-group C, D Baiyuerius shenyunxiaoi sp. nov. from rutolus-group A, C epigynes, ventral view B, D internal genitals, dorsal view.Abbreviations:A = atrium; BS = blind sac; CD = copulatory duct; CO = copulatory opening; ET = epigynal teeth; FD = fertilization duct; H = hood; PES = posterior epigynal sclerite; S = spermatheca; SE = swollen epigyne. The colored areas indicate the different part of epigynes: blue areas indicated the epigynal pockets, the yellow areas indicate the atriums. The black dash lines divide the posterior epigynal sclerite and the swollen epigyne. Scale bars: 0.50 mm.

FIGURE 15. Epigyne and internal genitalia of Baiyuerius shaanensis sp. nov. A epigyne, ventral view B internal genitalia, dorsal view. Abbreviations:A = atrium; CD = copulatory duct; CO = copulatory opening; ET = epigynal teeth; FD = fertilization duct; H = hood; PES = posterior epigynal sclerite; S = spermatheca; SE = swollen epigyne. Scale bar: 0.50 mm.

FIGURE 16. Characters of the female of Baiyuerius shaanensis sp. nov. A habitus, dorsal view B habitus, prolateral view C eye area, frontal view D eye area, dorsal view E cephalic rigion, lateral view. Scale bars: A, B 2.00 mm, C, D 0.50 mm, E 0.25 mm.

FIGURE 35. Distributions of Baiyuerius spp. 1 B. acroprocessus 2 B. arcticus sp. nov. 3 B. chongzu sp. nov. 4 B. globasus 5 B. imitatus sp. nov. 6 B. loong sp. nov. 7 B. processus comb. nov. 8 B. rugosus 9 B. shaanensis sp. nov. 10 B. subyanlingensis comb. nov. 11 B. yuelu 12 B. cuii sp. nov. 13 B. jiquanyui sp. nov. 14 B. digitus sp. nov. 15 B. zhuping 16 B. rotulus 17 B. shenyunxiaoi sp. nov. 18 B. wenshanensis sp. nov. 19 B. carcharus sp. nov. 20 B. daxi 21 B. fengbini sp. nov. 22 B. pindong 23 B. shenzhen 24 B. zuojiang.