Theridion irrugatum, Gao & Li, 2014

Gao, Cai-Xia & Li, Shu-Qiang, 2014, Comb-footed spiders (Araneae: Theridiidae) in the tropical rainforest of Xishuangbanna, Southwest China, Zoological Systematics 39 (1), pp. 1-135 : 106-109

Theridion irrugatum sp. nov. ( Figs 90–92 )

Holotype ♂, China, Yunnan, Xishuangbanna, Menglun , bamboo plantation (21º54.380'N, 101º16.815'E), 21 November 2009, Guo Tang and Zhi-Yuan Yao leg.

Etymology. The specific name derives from the Latin adjective irrugatus and means rugose, in reference to the

© Zoological Systematics, 39 (1): 1–135

© Zoological Systematics, 39 (1): 1–135 median apophysis with many pleats.

Diagnosis. The new species is very similar to T. longipili , but can be distinguished by the median apophysis with a ridge and many pleats; tegular apophysis similar to “H”.

Male. Total length 1.50. Prosoma 0.63 long, 0.55 wide, flat, brown, without spot. Sternum 0.31 long, 0.38 wide, brown with little setae. Opisthosoma 0.88 long, 0.66 wide, pale, with black and white spots, without colulus. Eye measurements: AME 0.08, ALE 0.06, PME 0.09, PLE 0.09, AME-AME 0.06, AME-ALE 0.02, PME-PME 0.02, PME-PLE 0.04. Clypeus height about 0.61 times AME diameter, yellow. Chelicerae: yellow, with 3 long spines, 1 anterior tooth; fangs long and slender. Endites: 0.34 long, 0.11 wide, yellow, with brown pro-edges. Labium fused with sternum, 0.06 long, 0.16 wide, with 2 setae, yellow. Leg measurements: I 2.27 (0.68, 0.19, 0.46, 0.50, 0.44); II 2.18 (0.65, 0.21, 0.44, 0.48, 0.40); III 1.86 (0.63, 0.20, 0.38, 0.35, 0.30); IV 2.60 (0.75, 0.23, 0.63, 0.55, 0.44). Leg I yellow, coxa without spot; femur without spine; patella with 2 spines; tibia with 2 spines; metatarsus and tarsus without spine. Legs II–IV similar to leg I. Pedipalpus ( Figs 90A–B , 91A–B , 92A–D ): tibia yellow, with 2 trichobothria; cymbium yellow, without spot;

© Zoological Systematics, 39 (1): 1–135

paracymbium hooded; subtegulum broad; tegulum confined, indistinguishable in ventral view; median apophysis with ridge, many pleats; embolus long, curved; conductor with notch, connected to tegulum by membrane; tegular apophysis wider than long, H-shaped.

Female. Unknown.

Distribution. Only known from type locality (Yunnan).

Figures

Fig. 90. Theridion irrugatum sp. nov., holotype male. A. Pedipalpus, prolateral view; B. Pedipalpus, retrolateral view. Scale bar = 0.10mm.

Fig. 91. Theridion irrugatum sp. nov., holotype male. A. Pedipalpus, ventral view; B. Embolus, ventral view. Scale bars = 0.10mm.

Fig. 92. Theridion irrugatum sp. nov., holotype male. A. Pedipalpus (cymbium removed), ventral view; B. Pedipalpus, ventral view; C. Pedipalpus, prolateral view; D. Pedipalpus, retrolateral view. Scale bars = 0.05 mm.