Auricula triangulara, Irfan & Zhang & Peng, 2022

Irfan, Muhammad, Zhang, Zhi-Sheng & Peng, Xian-Jin, 2022, Survey of Linyphiidae (Arachnida: Araneae) spiders from Yunnan, China, Megataxa 8 (1), pp. 1-292 : 26-27

Auricula triangulara sp. nov. (ΞssĄḋƦ)

Figures 24–29 .

Types. Holotype ♂, CHINA, Yunnan, Tengchong County: Jietou Township, Longtang He , 0.4 km N of Dahetou Lingganjiao, 25.74277°N, 98.69691°E, alt. 2020m, 17 May 2006, D. H. Kavanaugh and Roberta Brett leg. ( DHK –2006–027) ; Paratypes: 2♂ 3♀, same data as holotype ( DHK –2006–027); 3♂, Jietou Township , Dahetou Lingganjiao , 25.73947°N, 98.69630°E, alt. 2010m, 16 May 2006, D. H. Kavanaugh and R . L. Brett leg. (DHK–2006–025C); 1♂ 3♀, Jietou Township , Datang Village, Daheling Ganjiao, 25.74556°N, 98.69630°E, alt. 2030m, 15 May 2006, Xian-jin Peng, Xin-ping Wang and Peng Hu leg. (Peng 060515) ; 1♀, Tengchong County, Jietou Township , Datang Village, Longtang He river, 25.74556°N, 98.69630°E, alt. 2030m, 20 May 2006, Xianjin Peng and Peng Hu leg. (Peng 060520); 3 ♂ 3♀, Houqiao Township , Gaoshidong , 25.39859°N, 98.30531°E, alt. 2374m, 27 May 2006, Xin-ping Wang and Peng Hu leg. (Wang 060527–2); 1♂, Houqiao Township , 25.35391°N, 98.25488°E, alt. 1785m, 28 May 2006, Xin-ping Wang and Peng Hu leg. (Wang060528–1); 1♀, Mingguang Township , Zizhi Village, 25.78277°N, 98.61633°E, alt. 2200m, 21 May 2006, Ming-wei Yang leg. ( YHY10 ) ; 1♀, Shangyin Township , Cuanlong Village, 25.00667°N, 98.70992°E, alt. 1990m, 4 June 2006, Chang-min Yin, Jia-fang Hu, Ming-wei Yang and Shao-xian He leg. ( YHY10 ) .

Etymology. This epithet derives from the Latin adjective “ triangularis ”, meaning “triangular” and referring to the triangular shaped cephalic lobe in male.

Diagnosis. See diagnosis of A. aeda sp. nov..

Description. Male (holotype, Fig. 28A–C ): Total length: 2.96. Carapace 0.97 long, 0.98 wide, with triangular-shaped cephalic lobe 0.67 long emerging from middle of carapace and extending to a point anteriorly; cephalic pits yellow, present at base of cephalic lobe; fovea, cervical and radial grooves distinct. Clypeus 0.29 high. Sternum longer than wide, yellowish, sparsely covered with microsetae. Labium wider than long. Maxillae long, distal end broad with scopulae. Chelicerae with four promarginal and six retromarginal teeth. Eye region narrow,AER straight, PER procurved slightly wider than AER. Eye sizes and interdistances: AME 0.06, ALE 0.08, PME 0.07, PLE 0.06, AME–AME 0.02, PME–PME 0.09, AME–ALE, 0.05, PME–PLE 0.07, AME–PME 0.05, ALE–ALE 0.36, PLE–PLE 0.43, ALE–PLE contiguous. Length of legs: I 4.69 (1.39, 1.53, 1.13, 0.64), II 4.46 (1.32, 1.46, 1.08, 0.60), III 3.62 (1.11, 1.15, 0.89, 0.47), IV 4.57 (1.33, 1.46, 1.19, 0.59). Leg formula I-IV-II-III. Tm I 0.52 and Tm IV 0.47. Tibial spine formula: 2-2-1-1. Abdomen 1.58 long, 1.38 wide, oval, pale to light gray, dorsally with two longitudinal black bands, ventral side pale.

Palp ( Figs 24A–D , 25A–D , 26A–D ): Patella long, almost equal to the length of cymbium, dorsally with spines; tibia collectively with reterolateral apophysis almost equal to the length of cymbium, with one reterolateral and one dorsal trichobothria, with long, sclerotized, reterolateral tibial apophysis, pointing towards the prolateral side of tibia, distal tip slightly curved with pointed end; paracymbium hook-shaped, distal arm C-shaped with fine plate; tegulum possess long transparent protegulum, distal end strongly curved around the terminal apophysis, protruding above the apex of cymbium; Embolic division: sclerotized, complex, radix, tailpiece, anterior radical process hidden on unexpanded palp; radix somewhat elliptical, with anterior radial process and ear–lobe shaped tailpiece; terminal apophysis J-shaped, sclerotized, protruding above the apex of cymbium; embolus sclerotized, originates from reterolateral margin of the radix, long, distal end curved, protruding above the apex of cymbium.

Female (one of the paratypes, Fig. 28D–F ): Total length: 3.58. Carapace 1.27 long, 0.96 wide, yellow, mid dorsally slightly elevated; fovea, cervical and radial grooves distinct. Clypeus 0.24 high. Sternum longer than wide, yellow, sparsely covered with microsetae. Labium wider than long. Maxillae long, distal end broad with scopulae. Chelicerae with five promarginal and six retromarginal teeth. Eye region narrow, AER straight, PER procurved slightly wider than AER. Eye sizes and interdistances: AME 0.06, ALE 0.09, PME 0.07, PLE 0.07, AME–AME 0.02, PME–PME 0.07, AME–ALE, 0.04, PME–PLE 0.06, AME–PME 0.05, ALE–ALE 0.35, PLE–PLE 0.39, ALE–PLE contiguous. Length of legs: I 4.8 (1.38, 1.59, 1.15, 0.68), II 4.51 (1.29, 1.49, 1.12, 0.61), III 3.71 (1.09, 1.19, 0.94, 0.49), IV 4.77 (1.39, 1.53, 1.25, 0.60). Leg formula I-IV-II-III. Tm I 0.48 and Tm IV 0.41. Tibial spine formula: 2-2-1-1. Abdomen 1.27 long, 1.79 wide, oval, gray, dorsally with two longitudinal black bands, ventral side dusky gray.

Epigyne ( Fig. 27A–C ): Wider than long, sclerotized; ventral plate concave, connected with dorsal plate by septum to form shallow atrium with copulatory openings posteriorly at the base of septum; dorsal plate sclerotized, mid ventrally with depression; copulatory openings narrow. Vulva with long copulatory ducts, forming pairs of large round loop anteriorly; spermathecae globular, on lateral side of dorsal plate, pointing away from each other, separated by a distance of 2/3 of their diameter.

Distribution. Known only from the type locality ( Fig. 29 ).

Genus Bathyphantes Blackwall, 1859 (DzƦø)

Figures

FIGURE 24. Auricula triangulara sp. nov., male palp of holotype. A prolateral view B retrolateral view C dorsal view D ventral view.

FIGURE 25. Auricula triangulara sp. nov., male (one of paratypes). A–D Embolic division.

FIGURE 26. Auricula triangulara sp. nov., male (one of paratypes). A Tibia, ventral view B Tibia, dorsal view C, D Paracymbium.

FIGURE 27. Auricula triangulara sp. nov., female (one of paratypes). A, B Epigyne, ventral view C Vulva, dorsal view.

FIGURE 28. Auricula triangulara sp. nov., male holotype (A–C) and female (one of paratypes, D–F). A, D Habitus, dorsal view B, E Habitus, lateral view C, F Habitus, ventral view.

FIGURE 29. Distribution of Auricula gen. nov. species.