Utivarachna yumaoi Lin & Li, 2023

Lin, Yejie, Li, Shuqiang & Pham, Dinh-Sac, 2023, Taxonomic notes on some spider species (Arachnida: Araneae) from China and Vietnam, Zoological Systematics 48 (1), pp. 1-99 : 79-81

Utivarachna yumaoi Lin & Li , sp. nov. ( Figs 70–71 )

Etymology. The specific name is dedicated to the cat, Mr. Yumao, that belongs to Qianhui Zeng; noun (name) in genitive case.

Diagnosis. The new species is similar to U. rubra Deeleman-Reinhold, 2001 by the expanded middle part of the retrolateral tibial apophysis. However, the new species can be distinguished from U. rubra by the straight retrolateral tibial apophysis (vs. curved in U. rubra ).

Description. Male (holotype). Total length 5.69; carapace 2.79 long, 2.08 wide, opisthosoma 2.90 long, 1.96 wide. Eye sizes and interdistances: AME 0.15, ALE 0.17, PME 0.15, PLE 0.16, AME–AME 0.08, AME–ALE 0.10, PME–PME 0.22, PME–PLE 0.32, AME–PME 0.16, ALE–PLE 0.25. Chelicerae with three promarginal and four retromarginal teeth. Leg measurements: I 8.10 (2.43, 3.09, 1.67, 0.91), II 7.46 (2.10, 2.79, 1.66, 0.91), III 5.30 (1.53, 1.71, 1.39, 0.67), IV 6.56 (1.81, 2.22, 1.76, 0.77).

Coloration ( Fig. 71 ). Carapace dark brown, with black setae, lacking pattern. Chelicerae, labium dark brown. Sternum dark brown, with white setae. Legs yellow-brown. Opisthosoma oval, with black setae. Dorsum gray, with two pairs of muscle impressions, a light median band. Venter colored as dorsum, median area with pair of dark longitudinal bands, with scattered irregular black spots. Spinnerets white yellow.

Palp ( Fig. 70 ). Patella almost longer than wide. Retrolateral tibial apophysis almost as long as long as cymbium, expanded medially, terminus sharp. Cymbium almost two times longer than wide. Bulb 1.4 times longer than wide, oval. Sperm duct S-shaped. Embolus long and slender, coiling 720°.

Female. Unknown.

Material examined. Holotype ♂ (IZCAS-Ar44017), Vietnam: Ninh Binh, Cuc Phuong NP, Natural Forest, Sieving (20.3428°N, 105.6004°E, elev. 408 m), 8 October 2007, Dinh-Sac Pham leg.

Distribution. Known only from the type locality.

Figures

Figure 70.Utivarachna yumaoi Lin&Li,sp. nov., holotype male.A. Left palp, ventral view; B. Same, retrolateral view.Abbreviations: E—embolus; SD—sperm duct; RTA—retrolateral tibial apophysis. Scale bars=0.1mm.

Figure 71. Utivarachna yumaoi Lin & Li, sp. nov., holotype male, habitus. A. Dorsal view; B. Ventral view; C. Lateral view. Scale bars=1.0mm.