浙江狡蛛属一新种(蜘蛛目:狡蛛科)

A NEW SPECIES OF THE GENUS DOLOMEDES FROM ZHEJIANG, CHINA (ARANEAE: DOLOMEDIDAE)

本文记述采自浙江天目山的狡蛛属一新种——黑斑狡蛛Dolomedes nigrimaculatus sp.nov.。此新种近似星狡蛛D.stellatus Kishida,但本种腹部两前侧角各有一椭圆形黑褐斑,雄蛛触肢胫节突分叉,插入器的弯曲部不超越腔窝的末端,故应为一新种。

The present paper deals with a new species of the genus Dolomedes collected from Zhe-jiang Province. The type specimens are deposited in the Institute of Zoology, Academia Sinica. Dolomedes nigrimaculatus sp, nor. (figs. 1-4)Holotype ♀, allotype ♂, Mt. Tianmu, Zhejiang Province (30°3'N, 119°4'E), July 16, 1981.Female Total length 17.68 mm. Cephalothorax 8.78mm long, 6.80mm wide; abdomen 8.90 mm long, 5.56 mm wide. Carapace red brown, but its margin and clypeus much darker in colour. PLE= PME> AME> ALE (0.48: 0.48: 0.32: 0.29). The median ocular area wider behind than in front (1.23: 0.79), wider than long (1-23: 1.13). Promagin of fang furrow with 3 teeth, retromargin with 4 teeth. Leg formula: 4, 1, 2, 3. Abdomen red brown, on both anterior angles each with an elliptic dark brown spot.Male Total length 14.34 mm. Cephalothorax 7.66 mm long, 6.92 mm wide; abdomen 7.17mm long, 4.70mm wide. Colour and shape similar to those in the female.The new species differs from its closely related ally D. stellatus Kishida, 1936 in the following respects: (1) Anterolateral angles of abdomen with elliptic dark brown spots. (2) Tibial apophysis of the male palp forked off into two unequal tooth-like branches. (3) Embolus curved in the distal end of the alveolus not beyond the end of tie bulb. (4) Margin of the membranous conductor not chitinized.