摘要
记述二爪螨属 Dinychus Kramer1新种 :膨大二爪螨 Dinychus dilatatus,sp.nov.,该属为中国首次记录 。
The present paper reports a new species of the genus Dinychus, the genus is recorded for the first time from China. Dinychus dilatatus, sp. nov. (Figs.1～11) Adult. ♀ Length 655 μm, width 356 μm; ♂ length 701 μm, width 402 μm. Dorsum with dorsal and marginal shields. With 4 strongly pilose setae on posterior part of dorsal shield and 4 dilated leaf like setae on posterior part of marginal shield, remains of dorsal setae smooth. Tritosternum covered by coxae I. In female,genital shield arch shaped anteriorly, its posterior margin straight. Venter with 4 pairs of sternal setae, 7 pairs of ventral setae and 5 perianal setae, the first pair of ventral setae distant from genital shield, postanal seta distant from anus. Genital orifice of male situated interior to coxae III and IV. In both se xes, peritreme with U like curve, posterior projection of stigma reaching to level of posterior margin of coxa III; tectum, chela and gnathosomal setae are shown in figs.4～6. The new species near to Dinychus sublaevis (Trgrdh,1943) and Dinychus septentrio nalis (Trgrdh,1943), but in the new species 4 leaf like setae on posterior part of marginal shield broader, peritreme with U like curve, postanal seta distant from anus, the first pair of ventral setae of female distant from genital shield; however in the latter two species 4 leaf like setae of dorsum narrower, peritreme without U like curve, postanal seta of Dinychus sublaevis near to anus, the first pair of ventral setae of Dinychus septentrionalis near to genital shield. Holotype ♀, paratypes 1♂, 1 deutonymph and 1 protonymph, from forest soils, in Shulan (44°25′N, 126°57′E), Jilin Province, Ⅶ-1994. Type specimens are deposited in the National Base of Plague and Brucellosis Control, Baicheng City, Jilin Province.
