Gracilentus denticulatus, 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 : 104-109

Gracilentus denticulatus sp. nov.. (dzdzƦ)

Figures 120–123 , 128

Types. Holotype ♂, CHINA, Yunnan, Tengchong County, Jietou Township, Shabadi Village , 25.40024°N, 98.70986°E, alt. 1923m, 15 May 2006, Chang-min Yin, Jia-fang Hu and Ming-wei Yang leg. ( YHY02 ) . Paratypes: 1♂ 25♀, same data as holotype ( YHY02 ) ; 2♂, Tengchong County, Jietou Township , Zhoujiapo, 25.55844°N, 98.66619°E, alt. 1660m, 16 May 2006, Chang-min Yin, Jia-fang Hu and Ming-wei Yang leg. ( YHY03 ) ; 3♀, Tengchong County, Qushi Township , Xiangyanqiao Village, 25.21218°N, 98.57839°E, alt. 1500m, 4 June 2006, Peng Hu leg. ( YHY28 ) ; 2♀, Houqiao Township , 25.35391°N, 98.25488°E, alt. 1785m, 28 May 2006, Xin-ping Wang and Peng Hu leg. (Wang 060528–1) ; 2♀, Tengchong County, Houqiao Township , Doujiazhai Village, 25.35780°N, 98.22735°E, alt. 1673m, 30 May 2006, Xin-ping Wang and Peng Hu leg. (Wang 060530) ; 1♀, Tengchong County, Jietou Township , Shaba Village, 25.39262°N, 98.70347°E, alt. 1850m, 25 May 2006, Xinping Wang and Peng Hu leg. (Hu 060525) .

Etymology. This epithet derives from the Latin adjective “ denticulata ”, meaning “teeth”, referring to the radix with teeth in the male palp.

Diagnosis. See genus diagnosis.

Description. Male (holotype, Fig. 121E , 123A– C ): Total length: 2.75. Carapace 1.18 long, 0.98 wide; cephalic lobe 0.38 high, with eyes, brown; sulcus below eye-bearing lobe with many microsetae; fovea, cervical and radial grooves distinct. Clypeus 0.34 high. Sternum longer than wide, 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 0.09, PME 0.07, PLE 0.08, AME–AME 0.04, PME– PME 0.10, AME–ALE, 0.08, PME–PLE 0.07, AME– PME 0.09, ALE–ALE 0.42, PLE–PLE 0.46, ALE–PLE contiguous. Length of legs: I 4.44 (1.31, 1.41, 1.11, 0.61), II 4.31 (1.23, 1.42, 1.09, 0.57), III 3.12 (0.65, 0.95, 0.81, 0.41), IV 4 (1.18, 1.27, 1.07, 0.48). Leg formula I-II-IVIII. Tm I and Tm IV present. Tibial spine formula: 2-2-1- 1. Abdomen 1.57 long, 0.89 wide, oval, pale, mid dorsally with a longitudinal pale band, dorso-laterally with a dark green-grey pattern followed by three transverse chevrons, ventral side pale.

Palp ( Fig. 120A–D , 121A–D ): Patella much shorter than tibia; tibia with one reterolateral and one dorsal trichobothria, reterolateral tibial apophysis with blunt end; paracymbium sclerotized, U-shaped in retrolateral view and S-shaped in ventral view, posterior margin with a small projection which almost touches the cymbium in prolateral view. Embolic division: radix sclerotized, broad, round with several teeth, anterior margin with a tongue-shaped projection, distal part long and curved as a flap, completely covering the embolus; embolus curved, stout, sclerotized, completely covered by the anterior radical process and hidden in unexpanded palp.

Female (one of paratypes, Fig. 123D, E ): Total length: 2.51. Carapace 1.15 long, 0.85 wide; cephalic region slightly elevated, brown; fovea, cervical and radial grooves distinct. Clypeus 0.25 high. Sternum longer than wide, brown, sparsely covered with microsetae. Labium wider than long. Maxillae long, distal end broad with scapulae. Chelicerae sclerotized, dark brown, with five promarginal and six retromarginal teeth. Eyes: AER recurved, PER straight, slightly wider than AER. Eye sizes and interdistances: AME 0.05, ALE 0.07, PME 0.06, PLE 0.07, AME–AME 0.04, PME–PME 0.07, AME–ALE, 0.03, PME–PLE 0.04, AME–PME 0.06, ALE–ALE 0.30, PLE–PLE 0.34, ALE–PLE contiguous. Length of legs: I 4.35 (1.27, 1.41, 1.08, 0.59), II 4.30 (1.29, 1.31, 1.09, 0.61), III 3.01 (0.89, 0.93, 0.75, 0.44), IV 3.87 (1.14, 1.17, 1.02, 0.54). Leg formula I-II-IV-III. Tm I and Tm IV present. Tibial spine formula: 2-2-1-1. Abdomen 1.57 long, 0.89 wide, oval, pale, mid dorsally with a longitudinal pale band, dorso-laterally with a dark greenish-grey pattern followed by three transverse chevrons, ventral side pale.

Epigyne ( Fig. 122A–C ): Ventral plate, longer than wide, protruding above the epigastric furrow posteriorly, posterior margin irregular. copulatory openings present at the posterior margin of the ventral plate. Vulva: Dorsal plate longer than wide, fused with ventral plate posteriorly; copulatory ducts present mesally, forming a long loop before joining to the spermathecae; spermathecae globular, extending above the copulatory ducts anteriorly, separated by 2/3 distance of their diameter; fertilization ducts small, extending mesally.

Distribution. Known only from the type locality ( Fig. 128 ).

Figures

FIGURE 120. Gracilentus denticulatus sp. nov., male palp of holotype. A prolateral view B retrolateral view C ventral view D dorsal view.

FIGURE 121. Gracilentus denticulatus sp. nov., male (one of paratypes). A–C Embolic division D Paracymbium E Habitus, frontal view.

FIGURE 122. Gracilentus denticulatus sp. nov., female (one of paratype). A, B Epigyne, ventral view C Vulva, dorsal view.

FIGURE 123. Gracilentus denticulatus sp. nov., male holotype (A–C) and female, one of paratypes (D, E). A, D Habitus, dorsal view B Habitus, lateral view C, E Habitus, ventral view.

FIGURE 128. Distribution of Gracilentus gen. nov. species.