厚厉螨科二新种(蜱螨亚纲:革螨股)

Two new species of the family Pachylaelaptidae (Acari:Gamasina)

记述厚厉螨科二新种:光滑厚厉螨Pachylaelapsnuditectussp.nov.和陈氏厚绥螨Pachyseiuschenpengisp.nov.。

Two new species, Pachylaelaps nuditectus sp.nov.and Pachyseius chenpengi sp.nov.of the family Pachylaelaptidae are described from Heilongjiang,China. 1 Pachylaelaps nuditectus sp.nov.(Figs.1～5) ♀ Idiosoma 1218 μm long and 816 μm wide,dorsal shield 1149 μm long and 793 μm wide.Dorsal setae long,their end reaches to base of next setae,S 7 115 μm,but S 8 very short,only 11 μm long.Sterno metasternal shield bears 4 pairs of setae.Genito ventral shield with 2 pairs of setae.Anal shield triangular,Ad situated at level of anterior margin of anus,both Ad and PA longer than anus.Metapodal shields narrow.Tectum simple,without spines.Femur II with a seta bearing tubercle.Tarsus II with 2 spurs. The new species is near to Pachylaelaps magnus Halbert,1915,but in the new species dorsal setae long,with end reaching to base of next seta;tectum simple,without spines.In the latter species dorsal setae medium length,with end distant from base of next seta;tectum with several spines. Holotype ♀,paratype 1 ♀,from forest soils,in Liangshui Natural Preserve(47°10′N,128°53′E,350～450 m),Yichun City,Heilongjiang Province,Aug.1995. 2 Pachyseius chenpengi sp.nov.(Figs.6～10) ♀ Idiosoma 689 μm long and 402 μm wide.Dorsal shield covers entire dorsum,bearing 30 pairs of simple setae.Sternal shield with concave anterior margin and straight posterior margin.Metasternal shield small.Anterior part of ventro anal shield wider than posterior part,anterior margin slightly concave,preanal setae 2 or 3 pairs.Ad situated before level of anterior margin of anus,both Ad and PA longer than anus.Metapodal shield rod shaped.Peritreme reaches to gnathosomal base.Tectum triangular.Corniculus long and narrow.Tarsus II is armed with 2 large spurs and several spiniform setae. The new species is near to Pachyseius morenoi Moraza,1993,but in the new species anterior part of ventro anal shield distinctly wider than posterior part,the first pair of preanal setae close to anterior margin of the shield;in the latter species anterior part of ventro anal shield subequal to posterior part in width,the first pair of preanal setae distant from anterior margin of the shield. Holotype ♀,paratype 1 ♀,from forest soils,in Liangshui Natural Preserve (47°10′N,128°53′E,350～450 m),Yichun City,Heilongjiang Province,Oct.1995. The new species is named in honour of Prof.Chen Peng,a famous zoogeographer in China. Type specimens are all deposited in the National Base of Plague and Brucellosis Control,Baicheng,Jilin Province.