安徽沼虾属一新种记述(十足目:长臂虾科)

A NEW SPECIES OF MACROBRACHIUM FROM ANHUI, CHINA (DECAPODA: PALAEMONIDAE)

本文记述安徽西部沼虾属一新种梅山沼虾,新种Macrobrachium meishanense sp.nov.本新种与近似种江西沼虾M.jiangxiense Liang et Yan 1985之不同在于:新种额角较短,伸至鳞末或近鳞末;尾节末端有羽状刚毛2—4对;第二触角鳞片较宽短,长为宽的2.8—3.2倍;第二步足指节表面和切缘覆盖密毛,掌部和腕节满布小刺,腕节明显短于螯长,座节短于或等于长节等。模式标本存安徽师范大学生物系。

The preient paper deals with a new species of Macrobrachium collected from the western part of Anhui Province in 1982 and 1989. The type specimens are deposited in Anhui Normal University.Macrobrachium meishanense sp. nov. (figs. 1-4)Rostrum extending beyond the extremity of antennular penduncle. The upper margin with 11-14 teeth, 2-4 of which situated on the carapace behind orbit. The lower margin with 3-4 teeth.Second legs equal, shorter than the body, about 0.5-0.7 times as long as the body. Cutting edge of movable or fixed finger with two teeth at each side on the proximal portion. Dactylus about 0.7-0.8 times as long as the palm. Carpus shorter than chela.Comparison: The new species is similar to Macrobrachium jiangxtense Liang et Yan, 1985, but it differs from the latter in the following features:(l) Rostrum does not extend beyond the end of scaphocerite; (2) Scaphocerite is rather broad and short, with its length about 2.8-3.2 times of its width; (3) Dactylus of the second legs is covered wholly with dense hairs, and palm and carpus covered with numerous small spinules; (4) Carpus of the second legs is shorter than chela, about 0.8-0.9 times as long ar chela, and ischium is shorter than or equal to merus; (5) The specimens were light brown alive, carapace bears a dark brown marking, and the proximal portion of antennal 1,2 and peraeppods 2-5 were dark brown.Type locality Jinzhai County (31°41’ N, 115°52’ E), Anhui Province.