Baiyuerius shenzhen Luo & Lu & Zhang & Wang 2023, sp. nov.
Creators: name: Luo, Bin
name: Lu, Feng
name: Zhang, Zhi-Sheng
name: Wang, Lu-Yu
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Agelenidae
Baiyuerius
Baiyuerius shenzhen

description: Baiyuerius shenzhen sp. nov.  
Figs 4, 5, 7 (深圳百越蛛)  
Type materials.  
 Holotype male (SWUC-T-AG-119-01): China, Guangdong Province, Shenzhen City, Wutong Mountain, Taishanjian, Fenglingjing, 22°34′58″N, 114°11′51″E, elev. 205 m, 16 January 2023, F. Lu leg.; Paratype: 1 female (SWUC-T-AG-119-02), same data as holotype.   
Etymology.  
The specific name refers to the type locality; used as a noun in apposition.  
Diagnosis.  
 Male resembles B. zuojiang Zhao, Li & Li, 2023 in having a similar, slightly curved patellar apophysis with blunt end, retrolateral tibial apophysis originating at mid-length of tibia, cymbial furrow more than half length of the cymbium (Fig. 4; Zhao et al. 2023: fig. 6A-C), but of Baiyuerius shenzhen sp. nov. can be distinguished from the latter by the following: conductor with a smooth surface and flat margin (Fig. 5E-G) vs with jagged margin in B. zuojiang (Zhao et al. 2023: fig. 6A-C); cymbial base with two hypophyses (Fig. 5E-G) vs with one hypophysis in B. zuojiang (Zhao et al. 2023: fig. 6A-C); patellar apophysis extending above the 2/3 length of tibia (Fig. 5E-G) vs less than 1/2 length of tibia in B. zuojiang (Zhao et al. 2023: fig. 6A-C). Female of Baiyuerius shenzhen sp. nov. resembles B. zuojiang Zhao, Li & Li, 2023 in having a similar atrium, occupying 1/3 of the epigyne, and in the absence of epigynal teeth (Fig. 5D; Zhao et al. 2023: fig. 7A, B), but it can be distinguished from the latter by the following: copulatory opening mid-ventrally in the atrium in the new species (Fig. 5C) vs present in the anterio-lateral margin of the atrium in B. zuojiang (Zhao et al. 2023: fig. 7A); spermathecae highly convoluted in new species (Fig. 5D) vs round, fist-like in B. zuojiang (Zhao et al. 2023: fig. 7B).   
Description.  
 Male holotype (Figs 4B, 5A) total length 14.21. Carapace 8.14 long, 5.46 wide; opisthosoma 5.92 long, 4.47 wide. Carapace brown. Fovea longitudinal. Cervical groove and radial furrows distinct. Eye sizes and interdistances: AME 0.30, ALE 0.31, PME 0.31, PLE 0.33; AME-AME 0.21, AME-ALE 0.25, PME-PME 0.19, PME-PLE 0.45, ALE-PLE 0.11. MOA 0.73 long, front width 0.68, back width 0.77. Clypeus height 0.29. Chelicerae dark, with three promarginal and two retromarginal teeth. Endites and labium black-brown, longer than wide. Sternum brown, with brown hairs, heart-shaped. Legs yellow-brown. Leg measurements: I 22.93 (2.82, 5.64, 2.38, 4.73, 4.51, 2.85); II 20.78 (2.40, 5.06, 2.51, 4.02, 4.17, 2.62); III 17.83 (2.11, 4.34, 2.39, 3.09, 3.75, 2.15); IV 23.28 (2.36, 5.81, 2.38, 4.51, 5.57, 2.65). Leg formula: 4123. Opisthosoma oval. Dorsum yellow-brown, with several black-brown spots. Venter yellow-brown.   
Pedipalp (Fig. 5E-G): patellar apophysis finger-shaped with blunt end, extending above more than half the length of tibia; retrolateral tibial apophysis originating from midway along length of tibia; lateral tibial apophysis inconspicuous; cymbial furrow almost half the length of cymbium; cymbial base with two hypophyses; median apophysis semicircular in retrolateral view; embolus dark brown, originating at 6 o’clock; conductor translucent, with a smooth surface; conductor dorsal apophysis dark brown, with serrated margin.   
 Female paratype (Figs 4A, 5B) total length 17.67. Carapace 7.86 long, 5.07 wide; opisthosoma 9.45 long, 6.86 wide. Eye sizes and interdistances: AME 0.27, ALE 0.31, PME 0.30, PLE 0.36; AME-AME 0.15, AME-ALE 0.28, PME-PME 0.11, PME-PLE 0.46, ALE-PLE 0.11. MOA 0.64 long, front width 0.68, back width 0.71. Clypeus height 0.33. Legs yellow-brown. Leg measurements: I 19.36 (2.56, 5.02, 2.36, 4.09, 3.40, 1.93); II 17.54 (2.07, 4.30, 2.28, 3.58, 3.25, 2.06); III 14.29 (1.82, 3.48, 2.01, 2.34, 2.93, 1.71); IV 19.77 (2.16, 5.20, 2.29, 3.79, 4.37, 1.96). Leg formula: 4123.   
Epigyne (Fig. 5C, D): atrium glasses-shaped, occupying 1/3 of epigyne; epigynal hood located laterally; swollen area of epigyne rhomboid; copulatory opening located mid-centrally; copulatory ducts originating centrally, extending anteriorly, then curved inward, spermathecae bases close to each other; spermathecae highly convoluted; fertilization ducts transparent, extending laterally.  
Distribution.  
Known only from the type locality, Guangdong, China (Fig. 7).
description: Published as part of Luo, Bin, Lu, Feng, Zhang, Zhi-Sheng & Wang, Lu-Yu, 2023, A further study on the spider genus Baiyuerius Zhao, Li & Li, 2023, from China (Agelenidae, Coelotinae), pp. 91-102 in ZooKeys 1184 on page 91, DOI: 10.3897/zookeys.1184.107931