Baiyuerius daxi Zhao, B. Li & S. Li, 2023

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 : 436

Baiyuerius daxi Zhao, B. Li & S. Li, 2023

Figs 31 , 32 , 35

Baiyuerius daxi Zhao, B. Li & S. Li, 2023 in Zhao et al. 2023 b: 48, fig. 2A–E (♀).

Type material (not examined). Holotype ♀ (IZCAS-Ar44390) (LB084), CHINA: Guangxi Zhuang Autonomous Region: Guilin City , Yongfu County, Luojin Town , Daxi Village,Fushouyan Cave , 24.9704°N, 110.1463°E, elevation: 308 m, 4.Ⅰ.2018, Z. Chen leg. Paratype: 1♀ (IZCAS-Ar44391) (YX562), CHINA: Guangxi Zhuang Autonomous Region: Guilin City, Yongfu County, Luojin Town , Daxi Village, Jinzhongshan Scenic Area , Yongfuyan Cave (a cave near Fushouyan cave ), 24.9731°N, 110.1417°E, elevation: 236 m, 24.X.2019, Z. Chen leg.

Material examined. 1♀ ( CBEE), CHINA: Guangxi Zhuang Autonomous Region: Guilin City, Huixian County, Huixian wetland, 25.0935ºN, 110.2035ºE, elevation: 147 m, 15.IV.2023, local collector leg .; 1♂ ( CBEE), same data as above .

Diagnosis. Males of Baiyuerius daxi most resemble those of B. pindong by 1) cymbial dorsal apophysis large and extended ( Fig. 31C ; fig. 3C in Zhao et al. 2023); 2) lateral tibial apophysis round and extremely expanded ( Fig. 31C ; fig. 3C in Zhao et al. 2023). Males of the new species can be distinguished from those of B. pindong by 1) cymbial ecto-basal apophysis not extended ( Fig. 31B ), [vs. extending laterally in the latter (fig. 3B in Zhao et al. 2023)]; 2) process of dorsal margin of conductor nearly semicircular ( Fig. 31A–C ) [vs. roof-shaped and with base part rolled up (fig. 3A–C in Zhao et al. 2023)]; 3) tegular concave small ( Fig. 31B ) [vs. large and distinct in B. pindong (fig. 3B in Zhao et al. 2023)]. Females of B. daxi resemble those of B. zuojiang by atrium dividing into two rooms (figs 2A, 7A in Zhao et al. 2023). And can be easily distinguished from B. zuojiang , see Zhao et al. 2023 for detailed statement.

Description. Male. ( Fig. 32 ): Carapace black, cervical and radial grooves distinct. Cephalic region moderately raised, lateral margin with distinct furrows. Chelicerae robust, with three promarginal teeth and two postmarginal teeth, condyle red. Sternum longer than wide. Abdomen pale yellow, with 4 chevron-shaped patterns, covered by blueish gray hairs. Legs reddish brown, metatarsi and tarsi of the first and second legs with long and dense hairs. Total length 11.19. Carapace 6.46 long, 4.27 wide, cephalic region 3.08 wide. Abdomen 5.11 long, 3.55 wide. Eye size and interdistance: AME 0.22, ALE 0.28, PME 0.28, PLE 0.31; AME–AME 0.07, AME–ALE 0.12, AME–PME 0.11, ALE–PLE 0.05, PME–PME 0.06, PME–PLE 0.25. Leg measurements: I 16.85 (4.70, 1.82, 4.19, 4.06, 2.31), II 15.60 (4.33, 1.84, 3.67, 3.92, 2.18), III 12.86 (3.78, 1.60, 2.70, 3.58, 1.46), IV 17.80 (5.05, 1.96, 3.89, 5.13, 1.98).

Male palp ( Fig. 31 ). Patellar apophysis thick and digitate. Retrolateral tibial apophysis subequal to 2/3 the length of tibia. Lateral tibial apophysis large and swollen, round in shape. Cymbial furrow less than 1/4 the length of cymbium, triangular in shape. Dorsal cymbial dorsal apophysis large and extended. Conductor long, both of the ventral and dorsal margins serrated, process of dorsal margin of conductor modified and nearly semicircular, with serrated retrolateral margin. Dorsal apophysis of conductor large and flat, leaf-shaped, with a membranous base and a sclerotized round tip, and with a distinct basal lamellar. Tegular sclerite nearly trapezoidal, tegular concave small, nearly invisible from ventral view. Embolus filiform. Embolic base slightly enlarged. Median apophysis small, strongly sclerotized.

Female. See Zhao et al. (2023, fig. 2) for complete description.

Distribution. China (Guangxi Zhuang Autonomous Region).

Figures

FIGURE 31. Left male palp of Baiyueius daxi 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 retrolateral view E dorsal view. Abbreviations: BL = basal lamellar; 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; EB = embolic base; Em = embolus; EO = embolic opening; LTA = lateral tibial apophysis; MA = median apophysis; PA = patellar apophysis; RTA = retrolateral tibial apophysis; ST = subtegulum; T = tegulum; TS = tegular sclerite. Scale bars: A–C 0.50 mm, D, E 0.25 mm, F 0.05 mm.

FIGURE 32. Characters of the male of Baiyuerius daxi sp. nov. A habitus, dorsal view B habitus, prolateral view C eye area, frontal view D eye area, dorsal view E cephalic rigion, lateral view. Scale bars: A, B 3.00 mm, C, D 0.50 mm, E 0.25 mm.

FIGURE 35. Distributions of Baiyuerius spp. 1 B. acroprocessus 2 B. arcticus sp. nov. 3 B. chongzu sp. nov. 4 B. globasus 5 B. imitatus sp. nov. 6 B. loong sp. nov. 7 B. processus comb. nov. 8 B. rugosus 9 B. shaanensis sp. nov. 10 B. subyanlingensis comb. nov. 11 B. yuelu 12 B. cuii sp. nov. 13 B. jiquanyui sp. nov. 14 B. digitus sp. nov. 15 B. zhuping 16 B. rotulus 17 B. shenyunxiaoi sp. nov. 18 B. wenshanensis sp. nov. 19 B. carcharus sp. nov. 20 B. daxi 21 B. fengbini sp. nov. 22 B. pindong 23 B. shenzhen 24 B. zuojiang.