Taxon classification Animalia Araneae Linyphiidae

Cirrosus atrocaudatus sp. n. Figs 20, 21, 22, 23

Types.

Holotype ♂: CHINA, Yunnan: Menglun Town: Xishuangbanna Tropical Botanical Garden, 21°54.600'N, 101°17.084'E, elevation ca 640 m, 17.11.2009, Lvshilin tropical rain forest, fogging. Paratypes 1♂, same data as holotype; 1♂, 21°55.035'N, 101°16.500'E, elevation ca 558 m, 22.07.2009, primary tropical seasonal rain forest, fogging; 3♂1♀, 21°53.646'N, 101°16.957'E, elevation ca 589 m, 26.11.2009, bamboo plantation, fogging.

Etymology.

The name for this species comes from the Latin word ‘ater’ and ‘cauda’ . The former means ‘black’, and the latter means ‘tail’ . The combination refers to the dark end of the male’s abdomen; adjective.

Diagnosis.

See diagnosis of the genus.

Description.

Male (holotype). Total length: 1.41. Carapace 0.63 long, 0.50 wide, unmodified, light yellow. Sternum 0.31 long, 0.38 wide. Clypeus 0.19 high. Chelicerae promargin with 4 teeth, retromargin with 3 teeth. Eye sizes and interdistances: AME 0.06, ALE 0.06, PME 0.07, PLE 0.06, AME-AME/AME 0.33, PME-PME/PME 0.57, AME-ALE/ALE 0.33, PME-PLE/PLE 0.13, coxae IV separated by 1.92 times their width. Length of legs: I 2.05 (0.56, 0.18, 0.50, 0.50, 0.31), II 2.19 (0.61, 0.17, 0.55, 0.55, 0.31), III 1.64 (0.45, 0.16, 0.34, 0.42, 0.27), IV 2.02 (0.55, 0.17, 0.47, 0.52, 0.31). Leg formula: II-I-IV-III. Abdomen pale, with black posterior tip (Fig. 21C). Palp: see description of the genus.

Female (one of paratypes). Total length: 1.30. Carapace 0.60 long, 0.46 wide, tanned. Sternum 0.36 long, 0.33 wide. Clypeus 0.14 high. Chelicerae promargin with 4 teeth, retromargin with 3 teeth. Eye sizes and interdistances: AME 0.03, ALE 0.04, PME 0.04, PLE 0.05, AME-AME/AME 0.10, PME-PME/PME 0.10, AME-ALE/ALE 0.20, PME-PLE/PLE 0.40, coxae IV separated by 1.60 times their width. Length of legs: I 1.76 (0.50, 0.19, 0.40, 0.38, 0.29), II 2.02 (0.53, 0.18, 0.46, 0.44, 0.31), III 1.46 (0.39, 0.16, 0.30, 0.34, 0.27), IV 1.86 (0.48, 0.16, 0.48, 0.45, 0.29). Leg formula: II- IV-I-III. Abdomen beige, with dark posterior tip. Epigyne: see description of the genus.

Distribution.

Known only from type localities.