Baiyuerius yuelu 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 yuelu

description: Baiyuerius yuelu sp. nov.  
Figs 6, 7 (岳麓百越蛛)  
Type materials.  
 Holotype male (SWUC-T-AG-118-01): China, Hunan Province, Changsha City, Yuelu Mountain, 28°10′31″N, 112°56′10″E, elev. 83 m, 26 October 2013, L.Y. Wang leg.; Paratypes: 2 males and 1 female (SWUC-T-AG-118-02-04), same data as holotype.   
Etymology.  
The specific name refers to the type locality, used as a noun in apposition.  
Diagnosis.  
 Males resemble those of B. zhuping Zhao, Li & Li, 2023 in having the similar margin of conductor without any jags, patellar apophysis with a pointed distal end, and cymbial furrow more than half length of the cymbium in pedipalp (Fig. 6; Zhao et al. 2023: fig. 5A-C), but of B. yuelu sp. nov. can be distinguished from the latter by the following: conductor dorsal apophysis relatively robust with bifurcated apex and strongly sclerotized (Fig. 6E-G) vs small and light in B. zhuping (Zhao et al. 2023: fig. 5A-C); cymbial base with two hypophyses (Fig. 6E-G) vs with one hypophysis in B. zhuping (Zhao et al. 2023: fig. 5A-C). Female of B. yuelu sp. nov. resembles B. zuojiang Zhao, Li & Li, 2023 in having similar, round spermathecae (Fig. 6D; Zhao et al. 2023: fig. 7A, B), but it can be distinguished from the latter by the following: epigyne with conspicuous epigynal teeth in the new species (Fig. 6C) vs epigynal teeth absent in B. zuojiang (Fig. 6D; Zhao et al. 2023: fig. 7A); copulatory opening present mid-ventrally in the atrium (Fig. 6C) vs present in the anterio-lateral margin of the atrium in B. zuojiang (Zhao et al. 2023: fig. 7A); copulatory ducts strongly curved and with anterior ends almost touching each other (Fig. 6D) vs arc-shaped and with anterior ends laterally distant from each other in B. zuojiang (Zhao et al. 2023: fig. 7B).   
Description.  
 Male holotype (Fig. 6A) total length 12.49. Carapace 6.52 long, 4.44 wide; opisthosoma 6.21 long, 4.00 wide. Carapace yellow-brown. Fovea longitudinal. Cervical groove and radial furrows distinct. Eye sizes and interdistances: AME 0.23, ALE 0.30, PME 0.27, PLE 0.31; AME-AME 0.07, AME-ALE 0.12, PME-PME 0.08, PME-PLE 0.29, ALE-PLE 0.09. MOA 0.70 long, front width 0.51, back width 0.66. Clypeus height 0.17. Chelicerae black-brown, with three promarginal and two retromarginal teeth. Legs yellow-brown. Leg measurements: I 19.39 (2.24, 4.63, 1.84, 4.15, 3.94, 2.59); II 17.62 (1.94, 4.00, 2.00, 3.78, 3.51, 2.39); III 14.49 (1.65, 3.50, 1.59, 2.51, 3.27, 1.97); IV 19.41 (1.88, 4.76, 2.01, 3.88, 4.55, 2.33). Leg formula: 4123. Opisthosoma oval. Dorsum light yellow, with several yellow-brown stripes. Venter brown.   
Pedipalp (Fig. 6E-G): patellar apophysis brown and with a pointed distal end; retrolateral tibial apophysis originating from the base of tibia; lateral tibial apophysis finger-like; median apophysis spoon-like; cymbial furrow subequal to 2/3 length of cymbium; cymbial base with two hypophyses; embolus brown, originating at a 6 o’clock position, first quarter widened, then narrowing and wrapped by conductor, embolic base brown, 2 times wider than long; conductor translucent, with a smooth surface and flat margin; conductor dorsal apophysis with bifurcated apex and strongly sclerotized.   
 Female (paratype, Fig. 6B) total length 15.86. Carapace 6.98 long, 4.79 wide; opisthosoma 8.91 long, 6.29 wide. Eye sizes and interdistances: AME 0.19, ALE 0.31, PME 0.28, PLE 0.32; AME-AME 0.10, AME-ALE 0.26, PME-PME 0.10, PME-PLE 0.43, ALE-PLE 0.08. MOA 0.59 long, front width 0.56, back width 0.70. Clypeus height 0.30. Legs yellow-brown. Leg measurements: I 17.38 (2.03, 4.58, 1.92, 3.59, 3.29, 1.97); II 15.98 (1.99, 4.04, 1.82, 3.28, 3.02, 1.83); III 13.73 (1.75, 3.29, 1.88, 2.43, 2.81, 1.57); IV 18.29 (2.17, 4.55, 2.17, 3.54, 3.85, 2.01). Leg formula: 4123.   
Epigyne (Fig. 6C, D): atrium glasses-shaped, occupying 1/3 of epigyne; epigynal hood located central-laterally; epigynal teeth distinct, copulatory ducts originating centrally, extending anteriorly, then curved inward, heart-shaped, copulatory opening located mid-centrally; spermathecae coiled to fist-shaped; fertilization ducts transparent, extending laterally.  
Distribution.  
Known only from the type locality, Hunan, 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