Baiyuerius loong Wei & J. 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 : 415

publication ID	https://doi.org/10.11646/zootaxa.5636.3.1
publication LSID	lsid:zoobank.org:pub:1A564430-7BA5-4159-A595-3BF3DF2F2D7A
DOI	https://doi.org/10.5281/zenodo.15561599
persistent identifier	https://treatment.plazi.org/id/24487D50-B40E-FFC2-9B91-FF10FD67F806
treatment provided by	Plazi
scientific name	Baiyuerius loong Wei & J. Liu
status	sp. nov.

Treatment

Baiyuerius loong Wei & J. Liu sp. nov.

Figs 1B View FIGURE 1 , 11–14 View FIGURE 11 View FIGURE 12 View FIGURE 13 View FIGURE 14 , 35 View FIGURE 35

Type material. Holotype ♂ ( CBEE), CHINA: Yunnan Provence: Honghe Hani and Yi Autonomous , Gejiu County, Gejia Forest Park , 23.3892°N, 103.1254°E, elevation: 2045 m, 23.VIII.2020, M. Wei leg. GoogleMaps Paratype: 1♀ ( CBEE), same data as holotype GoogleMaps .

Etymology. The species name of the new species “loong ” is in reference to the Chinese Dragon, and indicates the shape of the conductor in male palp and the blind sac of copulatory duct in female internal genitalia of this new species.

Diagnosis. Males of Baiyuerius loong sp. nov. resemble those of B. processus comb. nov. by 1) with relatively large and drop-shaped cymbial ecto-basal apophysis ( Fig. 11C View FIGURE 11 ; fig. 24 in Xu and Li 2007); 2) process of dorsal margin of conductor dorsal-fin-shaped ( Fig. 11B View FIGURE 11 ; figs 12, 24 in Xu and Li 2007); 3) embolus thin, with extremely enlarged embolic base and modified embolic tip ( Fig. 11F View FIGURE 11 ; fig. 25 in Xu and Li 2007). But the new species can be distinguished from the latter by 1) the presence of a large dorsal cymbial apophysis ( Fig. 11C View FIGURE 11 ) [vs. without cymbial dorsal apophysis in the latter (figs 13, 25 in Xu and Li, 2007); 2) tegular sclerite trapezoidal and without apophysis ( Fig. 11B View FIGURE 11 ) [vs. strip-shaped and with a sharp distal apophysis in B. processus comb. nov. (figs 12, 24 in Xu and Li, 2007)]; 3) process of dorsal margin of conductor thin and sharply turned upward ( Fig. 11B View FIGURE 11 ) [vs. broad and not like that in the latter (figs 12, 24 in Xu and Li, 2007); 4) embolic base hammer-shaped, with a small round prolaterally apophysis ( Fig. 11B View FIGURE 11 ) [vs. semicircular, with a long and sharp prolateral apophysis in the latter (figs 12, 24 in Xu and Li, 2007). Females of B. loong sp. nov. resemble those of B. chongzu sp. nov. and B. rugosus and can be easily distinguished from the latter, see in diagnosis of B. chongzu sp. nov. for detailed statement.

Description. Male holotype ( Fig. 12 View FIGURE 12 ). Carapace brown, cervical and radial grooves distinct. Cephalic region moderately raised, lateral margin with distinct furrows. Chelicerae with three promarginal teeth and two retromarginal teeth. Sternum longer than wide. Abdomen pale yellow, with chevron-shaped patterns, covered by blueish gray hairs. Legs brown, metatarsi and tarsi of the first and second legs with long and dense hairs. Total length 10.15. Carapace 5.67 long, 3.98 wide, cephalic region 3.03 wide. Abdomen 4.36 long, 3.17 wide. Eye size and interdistance: AME 0.17, ALE 0.23, PME 0.21, PLE 0.23; AME–AME 0.10, AME–ALE 0.20, AME–PME 0.15, ALE–PLE 0.07, PME–PME 0.09, PME–PLE 0.32. Leg measurements: I 14.60 (4.04, 1.67, 3.65, 3.40, 2.25), II 12.93 (3.53, 1.72, 3.08, 3.13, 2.00), III 10.85 (3.05, 1.50, 2.13, 2.76, 1.51), IV 14.74 (4.05, 1.79, 3.31, 3.87, 1.94).

Palp ( Fig. 11 View FIGURE 11 ). Patellar apophysis strong, digitate with blunt tip. Retrolateral tibial apophysis and lateral tibial apophysis long and sharp, subequal to the length of tibia. Cymbium with large dorsal apophysis, and with a drop-shaped ecto-basal apophysis; cymbial furrow subequal to 1/3 the length of cymbium, bean-shaped and with distinct dorsal margin. Conductor groove membranous and thin, with round tip; process of dorsal margin of conductor turned sharply and pointed upward; dorsal apophysis of conductor triangular, without basal lamella. Embolus thin and long; embolic tip modified, with a large dorsal lamella and a ventral spine; embolic base extremely large and hammer-shaped, with a semicircular prolateral apophysis. Median apophysis human-ear-shaped, with a sharp lower corner and a small basal apophysis.

Female paratype ( Fig. 14 View FIGURE 14 ). Same in colour and abdominal patterns as male. Chelicerae with three promarginal teeth and two retromarginal teeth. Metatarsi and tarsi of the first and second legs with normal hairs. Total length 12.39. Carapace 6.27 long, 4.18 wide, cephalic region 3.68 wide. Abdomen 6.23 long, 3.70 wide. Eye size and interdistance: AME 0.19, ALE 0.28, PME 0.25, PLE 0.30; AME–AME 0.10, AME–ALE 0.21, AME–PME 0.16, ALE–PLE 0.07, PME–PME 0.08, PME–PLE 0.38. Leg measurements: I 13.91 (4.12, 1.88, 3.34, 2.94, 1.84), II 12.34 (3.64, 1.58, 2.90, 2.86, 1.72), III 9.89 (2.98, 1.55, 2.03, 2.35, 1.40), IV 14.33 (4.24, 1.75, 3.18, 3.57, 1.91).

Epigyne ( Fig. 13A View FIGURE 13 ). Epigynal teeth present.Atrium anterior situated, invert-triangular-shaped, with length twice longer than width. Posterior epigynal pocket large and sclerotized, anterior margin V-shaped, posterior epigynal sclerite large and moderately sclerotized, swollen epigyne strongly sclerotized. Hoods deep, vertically oriented, situated laterally below atrium, linear in shape.

Internal genitalia ( Fig. 13B View FIGURE 13 ). Copulatory ducts long, blind sacs long and extending anteriorly. Spermathecae small and nearly spherical, spermathecal heads sclerotized and stick-shaped, situated on the tips of blind sacs. Fertilization ducts posteriorly situated.

Distribution: China (Yunnan Province).