兰州滑绥螨属一新种记述(蜱螨亚纲,中气门目,裂胸螨科)

A NEW SPECIES OF THE GENUS LEIOSEIUS FROM CHINA(ACARI,MESOSTIGMATA,ACEOSEJIDAE)

记述滑绥螨属1新种,兰州滑绥螨Leioseius lanzhouensis sp.nov.。

A new species of the genus Leioseius, L. lanzhouensis sp. nov. is described. Type specimens are deposited in the Entomology Gallery, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences, Beijing. Leioseius lanzhouensis ap. nov. （Figs. 1-7） Female. Dorsal shield 419-430 （av. 423 ） μm in length and 194-204 （av. 201 ）μm in width, with 1 pair of short lateral incisions, strongly reticulated on surface; dorsal shield setae 18 pairs on anterior region and 15 pairs on posterior region, all setae very short and simple, but M11 slightly longer. Sternal shield with concave posterior margin, St1 situated before the shield, 2 pairs of setae and 3 pairs of pores on the shield. MSt on cuticle interior to endopodal shields. Posterior part of genital shield distinctly expanded, genital setae 1 pair. Ventro-anal shield sub-circular, with 3 pairs of setae except perianal setae. Ad lying behind level of middle of anus, slightly shorter than anus, PA longer. Ventral cuticle setae 8 pairs around ventro-anal shield. Metapodal shields 1 pair, club-shaped. Peritrcme reaching to base of F2 anteriorly. Tectum 3-tined. Movable digit of chela bidentate. Legs setae short and simple. Male. Dorsal shield 344 μm in length and 161 μm in width. Dorsum as in female. Stereo-genital shield narrow, with 5 pairs of setae and 3 pairs of pores. Ventro-anal shield semicircular, with 6 pairs of setae except perianal setae. Spermatodactyl of chela slender and hook-like. Remaining characters as in female. The new species is similar to Leioseius naglitschi Karg, 1965 and Leioseius elongatus Evans, 1958, but differs in the dorsal setae M11 simple and sharp （in L. naglischi M11 pilose and blunt）; and posterior part of genital shield distinctly expanded （in L. elongatus posterior part of genital shield not expanded）. Holotype ♀, paratypes 2 ♀♀ and 1 ♂ , ex soil, from Lanzhou （36°N, 103°48＇E）, Gansu Province, in 18 June 2004. Etymology. The new species is named after collected locality of type specimens.