Baiyuerius shenyunxiaoi Wei & J. Liu sp. nov.

Figs 2C, D, 23, 24, 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. Paratype: 1♀ (CBEE), same data as holotype .

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, 25A); 2) copulatory ducts straight or slightly bent outward (Fig. 23B, 25B). 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) [vs. present in the latter (Fig. 25A)]; 2) anterior margin of epigynal pocket V-shaped and weakly sclerotized (Fig. 23A) [vs. M-shaped and strongly sclerotized in the latter (Fig. 25A)]; 3) the swollen epigyne relatively small and weakly sclerotized (Fig. 23A) [vs. large and strongly sclerotized in the latter (Fig. 25A)]; 4) copulatory ducts bent outward (Fig. 23B) [vs. straight in the latter (Fig. 25B)]; 5) spermathecae long and stick-shaped (Fig. 23B) [vs. nearly spherical in the latter (Fig. 25B)].

Description. Female holotype (Fig. 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). 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). 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).