Baiyuerius fengbini Wei & J. Liu sp. nov.

Figs 33, 34, 35

Type material. Holotype. ♀ (CBEE), CHINA: Guangxi Zhuang Autonomous Region: Guilin City, Huixian County, Huixian wetland, 25.0935ºN, 110.2035ºE, elevation: 147 m, 15.Ⅰ Ⅴ.2023, local collector leg.

Etymology. The specific name is dedicated to Mr. Fengbin Yu who provided the location of the new species, noun (name) in genitive case.

Diagnosis. Females of Baiyuerius fengbini sp. nov. resemble those of B. shenzhen by 1) the width of epigynal pocket more than 1/2 of the length (Fig. 33A; fig. 5C in Luo et al. 2023) (Fig. 29A; figs 2A, 7A in Zhao et al. 2023); 2) spermathecae large, with width subequal to 1/4 of the posterior margin of epigyne (Fig. 33B; fig. 5D in Luo et al. 2023). But the new species can be distinguished from B. shenzhen by 1) anterior margin of epigynal pocket Vshaped (Fig. 33A) [vs. arc-shaped in the latter (fig. 5C in Luo et al. 2023)]; 2) copulatory ducts originated between spermathecae (Fig. 33B) [vs. outside of spermathecae in the latter (fig. 5D in Luo et al. 2023)]; 3) spermathecae with smooth surface (Fig. 33B) [vs. with numerous tubercles in the latter (fig. 5D in Luo et al. 2023)].

Description. Female holotype (Fig. 34). Carapace black, cervical and radial grooves distinct. Cephalic region moderately raised, lateral margin with distinct furrows. Chelicerae robust, with three promarginal teeth and two postmarginal teeth, condyle red. Sternum longer than wide. Abdomen pale yellow, with chevron-shaped patterns, covered by blueish gray hairs. Legs reddish brown, metatarsi and tarsi of the first and second legs with normal hairs. Total length 12.63. Carapace 4.80 long, 3.63 wide, cephalic region 2.96 wide. Abdomen 7.18 long, 4.69 wide. Eye size and interdistance: AME 0.17, ALE 0.31, PME 0.25, PLE 0.30; AME–AME 0.09, AME–ALE 0.17, AME–PME 0.11, ALE–PLE 0.07, PME–PME 0.06, PME–PLE 0.29. Leg measurements: Leg I 11.85 (3.56, 1.47, 2.75, 2.44, 1.71), leg II 10.78 (3.12, 1.49, 2.49, 2.48, 1.42), leg III 9.28 (2.70, 1.46, 1.86, 2.22, 1.31), leg IV 13.05 (3.52, 1.68, 3.04, 3.32, 1.68).

Epigyne (Fig. 33A). Epigynal teeth absent. Atrium large, occupying 1/3 of the epigynal plate. Epigynal pocket large, anterior margin V-shaped. Posterior epigynal sclerite strong. Hoods long, situated laterally of atrium. Copulatory opening situated centrally.

Internal genitalia (Fig. 33B). Copulatory ducts short, with elongate but flat blind sacs extending laterally, distal part of blind sac pointed inward. Spermathecae large, nearly spherical, and closed to each other, spermathecal heads reduced, with membranous tips remaining on the distal tips of blind sacs. Fertilization ducts short, situated posteriorly.

Distribution. China (Guangxi Zhuang Autonomous Region).