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

Figs 6 , 7 , 8

Type material.

Holotype ♂ (IZCAS-Ar44395) (LB070): China: Guangxi Zhuang Autonomous Region: Chongzuo City: Jiangzhou District, Tuolu Town, Zuojiang Overseas Chinese Farm, an unnamed cave, 22.6155°N, 107.6494°E, elevation: 107 m, 12.XII.2017, Z. Chen leg. Paratypes: 1♂4♀♀ (IZCAS-Ar44396-Ar44400) (LB070): same data as holotype.

Etymology.

The new species is named after the type locality, the Zuojiang Overseas Chinese Farm; noun in apposition.

Diagnosis.

The males of Baiyuerius zuojiang sp. nov. resemble those of B. pindong sp. nov. by the margin of conductor jagged and dorsal apophysis large, patellar apophysis with a blunt and bent distal end; resemble those of B. zhuping sp. nov. by cymbial base with one hypophysis, lateral tibial apophysis finger-like. However, it can be distinguished from them by 1) median apophysis coiled and jagged (Fig. 6B ) vs. without any jags and flat (in B. pindong ) or with three lobes (in B. zhuping ) (Figs 3B, C , 5B, C ). The females of B. zuojiang sp. nov. resemble those of B. daxi sp. nov. by glasses-shaped atrium, and copulatory ducts extending first posteriorly then anteriorly, along the sclerotic margins of the atrium, anterior separated from each other. However, it can be distinguished from B. daxi as follows: 1) atrium occupying 1/3 of the epigyne (Fig. 7A ) vs. half of epigyne in B. daxi (Fig. 2A ); 2) posterior epigynal sclerite rhomboid, longer than wide (Fig. 7A ) vs. pentagonal, as the same length as its width in B. daxi (Fig. 2A ); and 3) copulatory ducts originating posteriorly, from the dorsal spermathecae then extending anteriorly (Fig. 7B ) vs. originating centrally and near posteriorly, from the ventral spermathecae then extending anteriorly (Fig. 2B ).

Description.

Male (holotype) (Fig. 7C ). Total length 8.62. Carapace 4.59 long, 2.93 wide. Abdomen 4.03 long, 4.58 wide. Eye sizes and interdistances: AME: 0.11, ALE: 0.14, PME: 0.12, PLE: 0.15; AME-AME: 0.04; AME-ALE: 0.07; AME-PME: 0.04; ALE-PLE: 0.02; PME-PME: 0.02; PME-PLE: 0.11. Leg measurements: I: 12.76 (1.36, 0.46, 3.34, 1.07, 2.52, 2.42, 1.59); II: 12.29 (1.19, 0.44, 3.32, 1.03, 2.06, 2.47, 1.78); III: 10.26 (1.12, 0.41, 2.62, 1.04, 1.57, 2.02, 1.48); IV: 13.64 (1.12, 0.46, 3.44, 1.16, 2.48, 3.26, 1.72). Leg formula 4> 1> 2> 3. Carapace black turning dark brown, chelicerae, endites, and labium dark brown, sternum brown, longer than wide, spinnerets yellow-brown, legs dark brown turning yellow-brown. Male palp (Fig. 6 ): femur long, more than 4 times longer than wide, patella c. 1/4 of its bent tibia, patellar apophysis brown and with a blunt and bent distal end, 2.5 times longer than wide, extending over half of tibia, pointed to posterolaterally, retrolateral tibial apophysis originating from half of tibia, lateral tibial apophysis finger-like, distal end pointed to ventrally, median apophysis coiled to spoon-shaped, its anterior margin jagged, cymbial furrow c. 3/5 length of cymbium, cymbial base with a hypophysis, embolus dark brown turning black, originating at a 6 o’clock, first 1/4 widen, then narrowing and wrapped by conductor, embolic base 2 times longer than wide, conductor translucent, with a jagged margin, wrinkles and a membrane, dorsal apophysis translucent and brown, covered by the jagged membrane.

Female. (IZCAS-Ar44398) (Fig. 7D, E ). Total length 9.58. Carapace 4.89 long, 2.77 wide. Abdomen 4.69 long, 3.01 wide. Eye sizes and interdistances: AME: 0.10, ALE: 0.15, PME: 0.14, PLE: 0.13; AME-AME: 0.06; AME-ALE: 0.08; AME-PME: 0.04; ALE-PLE: 0.04; PME-PME: 0.04; PME-PLE: 0.17. Leg measurements: I: 11.47 (0.77, 0.39, 3.38, 1.09, 2.22, 2.13, 1.49); II: 10.51 (0.63, 0.39, 2.74, 1.03, 2.10, 1.97, 1.65); III: 8.41 (0.58, 0.35, 2.24, 0.82, 1.21, 1.84, 1.37); IV: 11.78 (0.68, 0.38, 3.13, 1.13, 2.43, 2.69, 1.34). Leg formula 4> 1> 2> 3. Carapace black turning dark brown, chelicerae black, endites and labium dark brown, sternum brown, spinnerets and legs yellow-brown. Female epigyne (Fig. 7A, B ): atrium glasses-shaped, occupying 1/3 of epigyne, with sclerotized lateral margins, epigynal hood located central laterally, posterior epigynal sclerite rhomboid, anterior of the lateral margin brown, while posterior of the lateral margin black, externally enlarged, milk-white, copulatory ducts originating posteriorly and extending anteriorly, c. 6.5 times longer than wide, spermathecae c. 1/4 of the length of copulatory ducts, spermathecal base close to each other, while anteriorly fist-like, fertilization ducts transparent, pointed to laterally, c. 3.5 times longer than wide.

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 3. Left male palp of Baiyuerius pindong sp. nov. A prolateral view B ventral view C retrolateral view (red arrows = hypophyses of cymbium). Scale bar equal for A-C. Abbreviations: C = conductor; CDA = dorsal apophysis of conductor; CF = cymbial furrow; E = embolus; EB = embolic base; LTA = lateral tibial apophysis; MA = median apophysis; PA = patellar apophysis; RTA = retrolateral tibial apophysis; ST = subtegulum; T = tegulum.

Figure 5. Left male palp of Baiyuerius zhuping sp. nov. A prolateral view B ventral view C retrolateral view (red arrow = hypophysis of cymbium). Scale bar equal for A-C. Abbreviations: C = conductor; CDA = dorsal apophysis of conductor; CF = cymbial furrow; E = embolus; EB = embolic base; LTA = lateral tibial apophysis; MA = median apophysis; PA = patellar apophysis; RTA = retrolateral tibial apophysis; ST = subtegulum; T = tegulum.

Figure 6. Left male palp of Baiyuerius zuojiang sp. nov. A prolateral view B ventral view C retrolateral view (red arrow: hypophysis of cymbium). Scale bar equal for A-C. Abbreviations: C = conductor; CDA = dorsal apophysis of conductor; CF = cymbial furrow; E = embolus; EB = embolic base; LTA = lateral tibial apophysis; MA = median apophysis; PA = patellar apophysis; RTA = retrolateral tibial apophysis; ST = subtegulum; T = tegulum.

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.