Baiyuerius daxi Zhao, B. Li & S. Li, 2023

Zhao, Zhe, Li, Bing, Zhang, Xiaoqing, Ballarin, Francesco, Pham, Dinh-Sac & Li, Shuqiang, 2023, Baiyuerius gen. nov., a new genus of Coelotinae (Araneae, Agelenidae) spiders from China and Vietnam, ZooKeys 1165, pp. 43-60 : 43

Baiyuerius daxi Zhao, B. Li & S. Li sp. nov.

Figs 2 , 8

Type material.

Holotype ♀ (IZCAS-Ar44390) (LB084): China: Guangxi Zhuang Autonomous Region: Guilin City: Yongfu County, Luojin Town, Daxi Village, Fushouyan Cave, 24.9704°N, 110.1463°E, elevation: 308 m, 4.I.2018, Z. Chen leg. Paratype: 1♀ (IZCAS-Ar44391) (YX562): same town as holotype, Jinzhongshan Scenic Area, Yongfuyan Cave (a cave near Fushouyan cave), 24.9731°N, 110.1417°E, elevation: 236 m, 24.X.2019, Z. Chen leg.

Etymology.

The new species is named after the type locality, the Daxi Village; noun in apposition.

Diagnosis.

Baiyuerius daxi sp. nov. resembles B. zuojiang sp. nov. by atrium glasses-shaped, outsides of posterior epigynal sclerite dark brown and copulatory ducts extending along the sclerotic margins of the atrium to its anterolateral margin. However, it can be distinguished from B. zuojiang as follows: 1) epigyne with two hoods (located anterolaterally and central laterally) (Fig. 2A ) vs. only one hood (located anterolaterally) in B. zuojiang (Fig. 7A ); 2) posterior epigynal sclerite pentagonal (Fig. 2A ) vs. rhomboid in B. zuojiang (Fig. 7A ); and 3) spermathecae extending anteriorly (Fig. 2B ) vs. extending laterally in B. zuojiang (Fig. 7B ).

Description.

Female (holotype) (Fig. 2C-E ). Total length 11.98. Carapace 6.02 long, 3.51 wide. Abdomen 5.96 long, 4.29 wide. Eye sizes and interdistances: AME: 0.11, ALE: 0.16, PME: 0.14, PLE: 0.15; AME-AME: 0.06; AME-ALE: 0.09; AME-PME: 0.04; ALE-PLE: 0.04; PME-PME: 0.05; PME-PLE: 0.16. Leg measurements: I: 14.81 (1.38, 0.56, 4.02, 1.29, 3.03, 2.61, 1.92); II: 13.26 (1.28, 0.57, 3.68, 1.27, 2.26, 2.35, 1.85); III: 11.85 (1.09, 0.47, 3.04, 1.22, 2.03, 2.42, 1.58); IV: 15.58 (1.35, 0.59, 4.29, 1.36, 2.85, 3.15, 1.99). Leg formula 4> 1> 2> 3. Carapace black turning brown, chelicerae black, endites and labium brown, sternum, spinnerets, and legs yellow-brown. Female epigyne (Fig. 2A, B ): atrium glasses-shaped, occupying half of epigyne, hoods located anterolaterally and central laterally, posterior epigynal sclerite near pentagonal, externally wrinkled and enlarged, copulatory ducts originating centrally and near posteriorly, extending first posteriorly then anteriorly, 4 times longer than wide, copulatory opening located anterolaterally, spermathecae coiled, touching each other, anterior 1/2 covered by its copulatory ducts, fertilization ducts separate from each other, c. 2.5 times longer than wide.

Male. Unknown.

Distribution.

Guangxi Zhuang Autonomous Region, China (Fig. 8 ).

Figures

Figure 2. Epigyne and habitus of Baiyuerius daxi sp. nov. A epigyne, ventral view B vulva, dorsal view C female habitus, dorsal view D female habitus, ventral view E female habitus, lateral view. Scale bar equal for C-E. Abbreviations: A = atrium; CD = copulatory duct; CO = copulatory opening; FD = fertilization duct (white dotted lines); H = hood; PES = posterior epigynal sclerite; S = spermatheca; SE = swell of epigyne.

Figure 7. Epigyne and habitus of Baiyuerius zuojiang sp. nov. A epigyne, ventral view B vulva, dorsal view C male habitus, dorsal view D female habitus, dorsal view E female habitus, ventral view; Scale bar equal for C-E. Abbreviations: A = atrium; CD = copulatory duct; CO = copulatory opening; FD = fertilization duct (white dotted lines); H = hood; PES = posterior epigynal sclerite; S = spermatheca; SE = swell of epigyne.

Figure 8. Localities of Baiyuerius species in China and Vietnam 1 B. daxi sp. nov. 2 B. pindong sp. nov. 3 B. tamdao sp. nov. 4 B. zhuping sp. nov. 5 B. zuojiang sp. nov.