Baiyuerius yuelu, Luo & Lu & Zhang & Wang, 2023

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), ZooKeys 1184, pp. 91-102 : 91

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 ).

Figures

Figure 6. Baiyuerius yuelu sp. nov., male holotype (A, E-G) and female paratype (B-D) A male habitus, dorsal view B female habitus, dorsal view C epigyne, ventral view D same, dorsal view (dash-line indicating the outline of fertilization ducts) E left male pedipalp, prolateral view F same, ventral view G same, retrolateral view. Arrows show the hypophysis of cymbium. Abbreviations: A = atrium; C = conductor; CD = copulatory duct; CDA = dorsal apophysis of conductor; CF = cymbial furrow; CO = copulatory opening; FD = fertilization duct; E = embolus; EB = embolic base; H = hood; LTA = lateral tibial apophysis; MA = median apophysis; PA = patellar apophysis; PES = posterior epigynal sclerite; RTA = retrolateral tibial apophysis; S = spermatheca; SE = swell of epigyne; ST = subtegulum; T = tegulum.

Figure 7. Distribution records of Baiyuerius species. 1 = B. acroprocessus (Zhang, Zhu & Wang, 2017) comb. nov.; 2 = B. daxi Zhao, B. Li & S. Li, 2023; 3 = B. globasus (Wang, Peng & Kim, 1996) comb. nov.; 4 = B. pindong Zhao, B. Li & S. Li, 2023; 5 = B. rugosus (Wang, Peng & Kim, 1996) comb. nov.; 6 = B. shenzhen sp. nov.; 7 = B. tamdao Zhao, B. Li & S. Li, 2023; 8. B. yuelu sp. nov.; 9 = B. zhuping Zhao, B. Li & S. Li, 2023; 10 = B. zuojiang Zhao, B. Li & S. Li, 2023 in China (blue circles indicate the distribution of species presented by Zhao et al. (2023)).