Sinisterigone circularis, 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 : 259

Sinisterigone circularis sp. nov. (AEḆǺẮƦ)

Figures 291–294 , 297

Types. Holotype ♂, CHINA, Yunnan, Fugong County, Lumadeng Township, Yamu bridge, 27.12817°N, 98.85977°E, alt. 1500m, 11, 14, 16 August 2005, Guo Tang leg. (Tang–05–04) . Paratypes: 11♂ 26♀, same data as holotype (Tang –05–04); 6♂ 5♀, Fugong County, Lumadeng Township , old Shibali, 27.07831°N, 98.77426°E, alt. 2305m, 15, 21 August 2005, Guo Tang leg. (Tang –05–07) ; 1♂ 1♀, Gongshan County, Binzhongluo Township , Shijitong Village, 28.04650°N, 98.59151°E, alt. 1575m, 10–11 November 2004, Guo Tang leg. (Tang –04–10) ; 6♀, 1.5–1.8km, 150° SW of fork in Yamu river , Yamu, S. fork, 27.11581°N, 98.83143°E, alt. 1842m, 26 April 2004, Charles Griswold and D. H. Kavanaugh leg. ( CGY14 ); 5♂ 6♀, Fugong County, 10 road km form Nujiang , on Shibali Rd on N fork, Yamu river, 27.13441°E, alt. 98.82622°E, alt. 1799m, 25 April 2004, Charles Griswold and D. H. Kavanaugh leg. ( CGY10 ); 1♂ 1♀, Tengchong County, 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♂, 10 km from Nujiang , on Shibali Road, along N fork, Yamu river, 27.13795°N, 98.82240°E, alt. 1850m, 27.13583°N, 98.82562°E, alt. 1790m, 25 April 2004, Charles Griswold and D. H. Kavanaugh leg. ( CGY12 ) ; 1♀, Longyang County, Mangkuan Township , Baihualing Village , Zaotang river, 25.30764°N, 98.79376°E, alt. 2 June 2005, 1625m, D. H. Kavanaugh, Charles Griswold, Da-zhi Dong and Heng-mei Yan leg. (2005–041A) ; 2♂ 1♀, Gongshan County, Qiqi , 27.71816°N, 98.56912°E, alt. 2000m, 1 October 2007, Xian-jin Peng leg. (2005–041A) ; 1♂ 7♀, Tengchong County, Jietou Township , Datang Village , Daheling Ganjiao, 25.42018°N, 98.40946°E, alt. 1878m, 19 May 2006, Xian-jin Peng, Xin-ping Wang and Peng Hu leg. ( Peng 060519) .

Etymology. This epithet derives from the Latin noun “ circularis ”, meaning “circle” and refers to the circular terminal apophysis (TA) in male palp.

Diagnosis. See genus diagnosis.

Description. Male (holotype, Fig. 294A, C ; one of paratypes, Fig. 294B ): Total length: 2.49. Carapace 1.05 long, 0.83 wide; cephalic lobe 0.43 long, with eyes, brown; fovea, cervical and radial grooves distinct. Clypeus 0.39 high. Sternum wider than long, dark brown,, sparsely covered with microsetae. Labium wider than long. Maxillae long, distal end broad with scopulae. Chelicerae sclerotized, dark brown, with four promarginal and five retromarginal teeth. Eyes: AER recurved, PER straight, slightly wider than AER. Eye sizes and interdistances: AME 0.05, ALE 0.06, PME 0.05, PLE 0.06, AME–AME 0.04, PME–PME 0.06, AME–ALE, 0.04, PME–PLE 0.05, AME–PME 0.08, ALE–ALE 0.29, PLE–PLE 0.33, ALE–PLE contiguous. Length of legs: I 4.28 (1.22, 1.38, 1.09, 0.59), II 4.15 (1.20, 1.37, 1.03, 0.55), III 3.04 (0.91, 0.93, 0.76, 0.44), IV 3.80 (1.08, 1.17, 1.01, 0.54). Leg formula I-II-IV-III. Tm I and Tm IV present. Tibial spine formula: 2-2-1-1. Abdomen 1.44 long, 0.89 wide, oval, pale, mid dorsally with a longitudinal pale band, dorsolaterally dark gray, ventral side pale.

Palp ( Figs 291A–D , 292A, B ); patella shorter than tibia; tibia conic, with two reterolateral and one dorsal trichobothria, with one reterolateral and one prolateral tibial apophyses, both with blunt end; cymbium round, covered with fine spines; paracymbium sclerotized, Ushaped, posterior margin almost touches the cymbium in prolateral view. Embolic division: radix sclerotized, distal end narrow with teeth; anterior radical process curved, almost forming a complete circle with distal pointed end; embolic membarane arises from the ventral side of radix, extending forward; embolus sclerotized, long, curved, whip-like.

Female (one of paratype, Fig. 294D, E ): Total length: 2.58. Carapace 1.08 long, 0.81 wide, cephalic region slightly elevated, dark brown, fovea, cervical and radial grooves distinct. Clypeus 0.33 high. Sternum wider than long, dark brown,, sparsely covered with microsetae. Labium wider than long. Maxillae long, distal end broad with scopulae. Chelicerae sclerotized, dark brown, with five promarginal and five retromarginal teeth. Eyes: AER recurved, PER straight, slightly wider than AER. Eye sizes and interdistances: AME 0.06, ALE 0.07, PME 0.06, PLE 0.06, AME–AME 0.04, PME–PME 0.06, AME–ALE, 0.05, PME–PLE 0.02, AME–PME 0.06, ALE–ALE 0.31, PLE–PLE 0.35, ALE–PLE contiguous. Length of legs: I 4.52 (1.25, 1.49, 1.16, 0.62), II 4.51 (1.27, 1.44, 1.15, 0.65), III 3.25 (0.93, 0.96, 0.89, 0.47), IV 4.03 (1.08, 1.26, 1.18, 0.51). Leg formula I-II-IV-III. Tm I and Tm IV present. Tibial spine formula: 2-2-1-1. Abdomen 1.44 long, 0.89 wide, oval, pale, mid dorsally with a longitudinal pale band, dorso-laterally dark gray, ventral side pale.

Epigyne ( Fig. 293A–C ): Ventral plate, wider than long; copulatory openings present at the junction of ventral and dorsal plate. Vulva: Dorsal plate round, broad, slightly depressed inward; copulatory ducts long, sclerotized, with three coiled spirals protruding anteriorly; spermathecae globular, fused with copulatory ducts, pointing towards the posterior margin; fertilization ducts thick, extending mesally.

Distribution. Known only from type locality ( Fig. 297 ).

Figures

FIGURE 291. Sinisterigone circularis sp. nov., male palp of holotype. A prolateral view B retrolateral view C ventral view D dorsal view.

FIGURE 292. Sinisterigone circularis sp. nov., male (one of paratypes). A Embolic division, dorsal view B Embolic division, ventral dorsal view.

FIGURE 293. Sinisterigone circularis sp. nov., female (one of paratypes). A, B Epigyne, ventral view C Vulva, dorsal view.

FIGURE 294. Sinisterigone circularis sp. nov., male (holotype, A, C, one of paratypes, B) and female (one of paratypes, D, E). A, D Habitus, dorsal view B Habitus, lateral view C, E Habitus, ventral view.

FIGURE 297. Distribution of Sinisterigone gen. nov.