Ketambea falcata, 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 : 143

Ketambea falcata sp. nov. (ỆǞÁƦ)

Figures 161 , 164

Types: Holotype ♀, CHINA, Yunnan, Gongshan County, Qiqi Dongshaofang , 27.69521°N, 98.48514°E, alt. 3208m, 29 September 2007, Xian-jin Peng leg. (20070929).

Etymology: This epithet derives from the Latin adjective “ falcatus ”, meaning “curved”, referring to the curved spermathecae in the epigyne.

Diagnosis: This new species resembles K. nigripectoris ( Oi, 1960) in: aperture oval, septum relatively wide, dividing aperture into two parts, but can be distinguished by: the spiral ducts with one loop in K. falcata sp. nov. ( Fig. 161C ), whereas with two loops in K. nigripectoris (Zhou, Irfan & Peng, 2018, fig. 3A–D).

Description. Female (holotype, Fig. 161A ). Total length 2.17. Carapace 1.06 long, 0.90 wide, yellow; cervical and radial grooves distinct. Clypeus 0.19 high. Sternum longer than wide, with sparse hairs. Labium yellow, wider than long. Maxillae long, distal end broad with scopulae and spine-like hairs. Chelicerae yellow, with three promarginal and three retromarginal teeth, stridulatory striae present. AER recurved, PER straight and slightly wider. Eye sizes and interdistances: AME 0.06, ALE 0.07, PME 0.06, PLE 0.08, AME–AME 0.04, PME–PME 0.06, AME–ALE, 0.06, PME–PLE 0.08, AME–PME 0.08, ALE–ALE 0.39, PLE–PLE 0.41, ALE– PLE contiguous. Length of legs: I 4.26 (1.16, 1.39, 1.02, 0.69), II 3.72 (1.04, 1.15, 0.89, 0.64), III 2.58 (0.77, 0.77, 0.62, 0.42), IV 3.37 (1.02, 1.02, 0.82. 0.51), legs long, slender and yellow. Leg formula: I-II-IV-III. Tm I 0.36. Tibial spine formula: 2-2-2-2. Abdomen; 1.46 long, 1.08 wide, oval, dark brown; ventral side light brown.

Epigyne ( Fig. 161B, C ): Aperture oval, septum relatively wide, dividing aperture into two parts. The entrance groove opening blocked with copulatory plug (seems distal suprategular apophysis of male palp broken into both openings in this female). Vulva: spiral ducts very thick, each with one loop; spermathecae slightly curved, pointing away from each other.

Male. Unknown.

Distribution. Known only from the type locality ( Fig. 164 ).

Figures

FIGURE 161. Ketambea falcata sp. nov., female holotype. A Habitus, dorsal view B Epigyne, ventral view C Vulva, dorsal view.

FIGURE 164. Distribution of Ketambea species.