Baiyuerius chongzu, Wei & Zhu & Liu & Zhang & Liu, 2025

Wei, Mian, Zhu, Yang, Liu, Jie, Zhang, He & Liu, Fengjie, 2025, New species and new combinations of the spider genus Baiyuerius Zhao, B. Li & S. Q. Li, 2023 (Araneae, Agelenidae, Coelotinae), Zootaxa 5636 (3), pp. 401-442 : 404-405

Baiyuerius chongzu -species group

Diagnosis. Males of the species in this group can be identified by 1) the long and sharp lateral tibial apophysis and retrolateral apophysis ( Figs 3C , 5C , 11C ; figs 12, 24 in Xu and Li 2007; fig. 5E in Liu et al. 2020; figs 1C, 6G in Luo et al. 2023); 2) dorsal margin of cymbial furrow extended anteriorly ( Figs 3C , 5C ; figs 5E, 7C in Liu et al. 2020; figs 1C, 6G in Luo et al. 2023); 3) process of dorsal margin of conductor extremely large and separate from dorsal margin by a basal stalk (reduced in B. processus comb. nov. and B. yuelu Luo, Lu, Zhang & Wang, 2023 ) ( Figs 3B , 5B , 11B ; figs 5D, 7B in Liu et al. 2020; figs 1B, 6F in Luo et al. 2023). Females of the species in chongzu -group can be identified by 1) epigynal plate large, the length of epigynal pocket subequal to the width (except B. shenzhen Luo, Lu, Zhang & Wang, 2023 ), and epigynal teeth present ( Fig. 9A , 13A , 15A ; figs 2A, 3A, 6C in Luo et al. 2023); 2) copulatory ducts relatively long, no less than width of spermathecae, blind sacs long and curved ( Fig. 9B , 13B , 15B ; figs 2B, 3B, 6D in Luo et al. 2023).

Notes. The males of B. loong sp. nov. and B. processus comb. nov. appear differently from the other chongzuspecies group, their basal stalks of the process of the conductor’s dorsal margin are reduced or not remarkable, and their processes are in strange shape, seem like a shark fin, and even hardly separated from the dorsal margin in B. processus comb. nov. ( Fig. 11B–E ; figs 24, 25 in Xu & Li, 2007). Additionally, these two species exhibit a more southern distribution pattern, which nears Vietnam, far away from others, which indicates they might be classified into a new group. But the females of B. loong sp. nov. extremely resemble B. chongzu sp. nov. and B. rugosas ( Wang, Peng & Kim, 1996) , especially the present of the epigynal teeth. With comprehensive consideration, we place them in chongzu -species group temporarily.

Distribution. China (Hubei Province, Hunan Province, Gansu Province, Guangxi Zhuang Autonomous Region, Guizhou Province, Jiangxi Province, Shaanxi Province and Yunnan Province).

Species included. Eleven species are included in this group: Baiyuerius acroprocessus (Zhang, Zhu & Wang, 2017) , Baiyuerius arcticus sp. nov., Baiyuerius chongzu sp. nov., Baiyuerius globasus ( Wang, Peng & Kim, 1996) , Baiyuerius imitatus sp. nov., Baiyuerius loong sp. nov., Baiyuerius processus ( Xu & Li, 2007) comb. nov., Baiyuerius rugosas ( Wang, Peng & Kim, 1996) , Baiyuerius shaanensis sp. nov., Baiyuerius subyanlingensis (Liu & Xu, 2020) comb. nov. and Baiyuerius yuelu Luo, Lu, Zhang & Wang, 2023 .

Figures

FIGURE 3. Male palp of Baiyueius arcticus sp. nov. A–C left palp D right bulb E conductor of right bulb F left embolic tip. A prolateral view B, F ventral view C retrolateral view D horizontally flipped dorsal view E horizontally flipped apical view. Abbreviations: BL = basal lamellar of conductor dorsal apophysis; C = conductor; CDA = dorsal apophysis of conductor; CDMP = process of dorsal margin of conductor; CF = cymbial furrow; E = embolus; EB = embolic base; EBA = basal apophysis of embolus; EO = embolic opening; LTA = lateral tibial apophysis; MA = median apophysis; PA = patellar apophysis; RTA = retrolateral tibial apophysis; T = tegulum; ST = subtegulum; TS = tegular sclerite. Scale bars: A–C 0.50 mm, D, E 0.25 mm, F 0.05 mm.

FIGURE 5. Male palp of Baiyueius chongzu sp. nov. A–C left palp D, E horizontally flipped right bulb F horizontally flipped right tibia G left embolic tip. A prolateral view B, G ventral view C retrolateral view D dorsal view E apical view G prolateral view. Abbreviations: BL = basal lamellar; C = conductor; CDA = dorsal apophysis of conductor; CDMP = process of dorsal margin of conductor; CF = cymbial furrow; EB = embolic base; Em = embolus; LTA = lateral tibial apophysis; MA = median apophysis; PA = patellar apophysis; PTA = prolateral tibial apophysis; RTA = retrolateral tibial apophysis; ST = subtegulum; T = tegulum; TS = tegular sclerite. Scale bars: A–C 0.50 mm, D–F 0.25mm, G 0.05mm.

FIGURE 9. Epigyne and internal genitalia of Baiyuerius imitatus sp. nov. A epigyne, ventral view B internal genitalia, dorsal view. Abbreviations: A = atrium; BS = blind sac; CD = copulatory duct; CO = copulatory opening; ET = epigynal teeth; FD = fertilization duct; H = hood; PES = posterior epigynal sclerite; S = spermatheca; SE = swollen epigyne; SH = spermathecal head. Scale bar: 0.50 mm.

FIGURE 11. Male palp of Baiyueius loong sp. nov. A–C left palp D, E horizontally flipped right bulb F left embolic tip. A prolateral view B, F ventral view C retrolateral view D apical view E dorsal view.Abbreviations: C = conductor; CDA = dorsal apophysis of conductor; CDMP = process of dorsal margin of conductor; CEBA = ecto-basal apophysis of cymbium; CF = cymbial furrow; CyDA = dorsal apophysis of cymbium; E = embolus; EB = embolic base; LTA = lateral tibial apophysis; MA = median apophysis; PA = patellar apophysis; RTA = retrolateral tibial apophysis; T = tegulum; ST = subtegulum; TS = tegular sclerite. Scale bars: A–C 0.50 mm, D, E 0.25 mm, F 0.05 mm.

FIGURE 13. Epigyne and internal genitalia of Baiyuerius loong sp. nov. A epigyne, ventral view B internal genitalia, dorsal view. Abbreviations: A = atrium; BS = blind sac; CD = copulatory duct; CO = copulatory opening; ET = epigynal teeth; FD = fertilization duct; H = hood; PES = posterior epigynal sclerite; S = spermatheca; SE = swollen epigyne; SH = spermathecal head. Scale bar: 0.50 mm.

FIGURE 15. Epigyne and internal genitalia of Baiyuerius shaanensis sp. nov. A epigyne, ventral view B internal genitalia, dorsal view. Abbreviations:A = atrium; CD = copulatory duct; CO = copulatory opening; ET = epigynal teeth; FD = fertilization duct; H = hood; PES = posterior epigynal sclerite; S = spermatheca; SE = swollen epigyne. Scale bar: 0.50 mm.