下盾螨属和伪寄螨属的新种记述(蜱螨亚纲:革螨股:厉螨科)

Two New Species of the Genera Hypoaspis and Pseudoparasitus(Acari:Gamasina:Laelapidae)

记述厉螨科 2新种 :鳞胸下盾螨 Hypoaspis lepisternalis sp.nov.和吉林伪寄螨 Pseudoparasitusjilinensis sp.nov.

Two new species belonging to the genera Hypoaspis and the genus Pseudoparasitus are described in the present paper. All type specimens are deposited in the National Base of Plague and Brucellosis Control,Baicheng City, Jilin Province. 1 Hypoaspis lepisternalis sp nov (Figs.1 6) ♀. Idiosoma 689 μm long and 460 μm wide. Dorsal shield 575 μm long and 345 μm wide, bearing about 25 pairs of setae, F 3minute, ET 1and ET 2shorter, remains medium in leugth, F 2longer than F 1, D row setae 8 pairs. Margins of sternal shield indistinct, surface covered with scale like reticulation, sternal setae 3 pairs. Metasternal setae on cuticle behind the shield. Genito ventral shield with one pair of setae. Anal shield pear shaped, Ad situated behind level of middle of anus, longer than anus, PA longer than Ad. Peritreme broad, reaching to anterior part of coxa Ⅱ. Movable digit of chela with 2 large teeth, fixed digit with 2 small and about 5 minute denticles. Leg Ⅳ with long whip like setae. The new species is similar to Hypoaspis simplexans (Womersley, 1956),but in the new species F 3 minute; margins of sternal shield indistinct, surface covered with scale like reticulation. In the latter species F 3 long;sternal shield with distinct margins and smooth surface. Holotype ♀,paratype 1 ♀, ex Polyphylla laticollis Lewis, from Lushan Mountain (29° 32′ N,115° 55′ E),Jiangxi Province, Aug. 30, 1983, by Ma Li Ming. 2 Pseudoparasitus jilensis sp nov (Figs.7 13) ♀. Idiosoma 586 643(av.622)μm long and 379 437(av.405)μm wide. Dorsal shield covered whole dorsum, bearing about 35 pairs of setae. Presternal shields one pair, wedge shaped. Sternal shield joined to metasternalia and endopodalia, anterior region of the surface reticulated, with St 1 St 3 and 3 pairs of pores, MSt lacking. Genito ventral shield flask shaped, expanded behind coxae Ⅳ, with truncate posterior margin, bearing 5 pairs of setae. Anal shield triangular, anterior margin straight, with one pair of preanal setae and 3 perianal setae. Ad situated at level of middle or posterior margin of anus, both Ad and PA longer than anus. Exopodal shields triangular behind coxae Ⅳ,its posterior angle sharp. Peritreme reaching to gnathosoma anteriorly, peritrematal shields free posteriorly. Tectum with anterior projection, the margin with denticles or smooth. Movable digit of chela bidentate. Setae on tarsus Ⅱ stout, pointed. The new species is similar to Pseudoparasitus centralis Berlese,1921,but in the new species dorsal setae long, posterior angles of sternal shield joined to endopodalia, MSt absent, exopodal shields sharp posteriorly, anal shield with one pair of preanal setae. In the latter species dorsal setae short, posterior angles of sternal shield free, MSt present, exopodal shields blunt posteriorly, anal shield without preanal setae. Holotyps ♀,paratypes 6 ♀♀,form forest soil, in Changchun City (43° 54′ N,125° 18′ E),Jilin Province, Jun. 15, 1990, by Ma Li Ming.