维螨属二新种(蜱螨亚纲 ,中气门目,维螨科)

TWO NEW SPECIES OF THE GENUS VEIGAIA OUDEMANS(ACARI, MESOSTIGMATA,VEIGAIAIDAE)

记述维螨属VeigaiaOudemans 2新种 :蒿县维螨V .songxianensissp.nov .和前凹维螨V .praeconcavasp .nov.。

The present paper describes two new species of the genus Veigaia Oudemans.All type specimens are deposited in the Institute of Plant Protection,Fujian Academy of Agricultural Science,Fuzhou,Fujian,China.1 Veigaia songxianensis sp.nov.(Figs.1-16) ♀.Length 597μm,width 460μm.Dorsal shield covered whole dorsum,with deep lateral incisions.Anterior region bearing 22 pairs of simple setae,M 3 on the shield,F 1,D 1,D 3 and M 2 long and stout,F 2,T 2,ET 1,ET 2,M 1 and M 3 minute.Posterior region bearing 21 pairs of simple setae,length of setae not reaching alveoli of next setae.Presternal shields 2 pairs,anterior one drop-like,posterior one narrow.Sternal shield with 3 pairs of setae and 2 pairs of pores.Metasternal setae and the 3rd pair of pores on metasternal shields.Genital shield setae 2 pairs.Ventral shield with 4 pairs of setae,genito-ventral intermediate setae situated at antero-internal margins of ventral shield.Punctiform organ with 5-6 pits arranged in a row,punctiform organ setae situated at interior margin of punctiform organ.Ventro-anal intermediate setae situated on cuticle between ventral and anal shields,mutual distance longer than that between setae at posterior margin of ventral shield.Peritrematal shield free posteriorly,peritreme reaching base of F 1 anteriorly,parastigmal seta situated on cuticle behind stigma.Medial prong of tectum with apical denticles,lateral prongs wing-shaped.Chela slender.A distal long seta on tibia Ⅳ pilose. The new species is similar to V.uncata Farrier,1957,but differs from the latter in ventral shield with one pair of short setae lateral region,genito-ventral intermediate setae situated at antero-internal margins of ventral shield,and medial prong of tectum expanded apically(in the latter species ventral shield with 2 pairs of short setae on lateral region,genito-ventral intermediate setae on cuticle between genital and ventral shields,medial prong of tectum bifurcate). Holotype ♀,paratypes 2 deutonymphs and 1 protonymph,in litter.Holotype from Mt.Baiyun(33.82°N,111.87°E),Song County,Henan 23 July 2001;paratypes from Lushi County(34°N,111°E),Henan,21 July 2001,coll.LIN Jian-Zhen.2 Veigaia praeconcava sp. nov.(Figs.17-27) ♀.Length about 600μm,width about 400μm.Dorsal shield with deep lateral incisions,anterior region bearing 22 pairs of simple setae,M 3 on the shield,F 1,D 1,D 3 and M 2 long and stout,F 2,T 2,ET 1,ET 2,M 1 and M 3 minute.Posterior region setae about 20 pairs,length of setae not reaching alveoli of next setae,D 4-D 8 subequal in length.Presternal shields one pair,triangular,anterior angle thin.Sternal shield with a pair of beak-like projections at anterior margin;sternal setae 3 pairs,St 1 on beak-like projections;pores 2 pairs.Metasternal shields with MSt and the 3rd pair of pores.Genital shield with 2 pairs of setae.Posterior margin of ventral shield concave,with 6 pairs of setae.Ventro-anal intermediate setae situated at posterior margin of ventral shield,genito-ventral intermediate setae on outicle between genital and ventral shields.Punctiform organ with 14-16 pits arranged in two rows,punctiform organ setae situated on genital shield interior to punctiform organ.Peritreme reaching base of F 1 anteriorly,peritrematal shield free posteriorly,parastigmal seta situated on cuticle behind stigma.A pair of tadpole-like sclerites behind anal shield.Medial prong of tectum with apical denticles,lateral prongs wing-shaped.Chela slender.Tibia and tarsus of leg Ⅳ bearing long setae,a distal seta of tibia being the longest. The new species is similar to V.songxianensis sp.nov.,but differs in having one pair of presternal shields,sternal shield with deep concavity at anterior margin,ventral shield setae 6 pairs,genito-ventral intermediate setae on cuticle between genital and ventral shields,and ventro-anal intermediate setae at posterior margin of ventral shield(the latter species 2 pairs of presternal shields,anterior margin of sternal shield without deep concavity,ventral shield with 4 pairs of setae,genito-ventral intermediate