二爪螨属和中螨属各一新种(蜱螨亚纲,前爪螨科,螨科 )

A NEW SPECIES OF THE GENUS DINYCHUS AND A NEW SPECIES OF THE GENUS MESOZERCON(ACARI,PRODINYCHIDAE,ZERCONIDAE)

记述尾足螨股前爪螨科二爪螨属 1新种 ,具齿二爪螨Dinychusdentatussp .nov .和革螨股螨科中螨属1新种 ,敦化中螨Mesozercondunhuaensissp .nov .。

This paper describes a new species of the genus Dinychus and a new species of the genus Mesozercon. Mesozercon was discovered for the first time in China.Type specimens are deposited in the National Base of Plague and Brucellosis Control,Baicheng City,Jilin Province.Uropodina Dinychus dentatus sp. nov.(Figs.1-19) Female.Length 735?μm,width 483?μm.Dorsal setae short and simple,posterior part of dorsal shield with 4 pilose macro-setae,posterior part of marginal shield with 8 pilose setae,of which 4 medial setae are broader.Base of tritosternum oval.Genital shield with several teeth at arched anterior margin.Sternal setae 4 pairs.Posterior pair of ventral setae pilose.Peritreme with U-like curve,posterior projection of stigma reaching to level of middle of coxa Ⅳ. Tectum,chela,gnathosomal setae and palptrochanteral setae showing in Figs.5-8. Male.Length 724-747?μm,width 517-540?μm.Genital orifice situated at level of anterior part of coxa Ⅳ.Sternal setae 5 pairs.Tritosternum with pentagonal base.The first pair of gnathosomal setae very broad.Remaining characters as in the female. The new species is near to Dinychus arcuatus(Trgrdh,1943),but differs in anterior margin of genital shield with large teeth,the last pair of ventral setae pilose (in the latter species anterior margin of genital shield with very small teeth, all ventral setae simple). Holotype ♀,paratypes 4 and 2 deutonymphs,from frest soil,in Dunhua County (43°21′N,128°13′E),Jilin Province,Aug.1990,coll.MA Li-Ming.Gamasina Mesozercon dunhuaensis sp. nov.(Figs.20-21) Female.Idiosoma 322-345?μm long,218-253?μm wide.Dorsal shield reticulated on surface.Dorsal setae i4-i6 and z1 smooth,remains one-sidedly feathered,but marginal setae one-or two-sidedly feathered.Lengths of setae and distances between setae on posterior dorsal shield in μm are given in the formulae of dorsal setae.Pore Po3 lies behind line connecting S3 and Z4.Sternal and genital shields indistinct.Ventro-anal shield with 8 pairs of preanal setae and 3 perianal setae.Peritrematal shields extended posteriorly,p2 twice longer than p1,both smooth. Male unknown. The new species differs from Mesozercon coreanus Blaszak,1975 and Mesozercon plumatus (Aoki,1966) in :dorsal setae of S-row and Z-row arranged in good order,p2 twice longer than p1 on peritrematal shield. In the latter 2 species dorsal setae S-row and Z-row chaotic,p2 equal to p1 in length,both short. Holotype ♀,paratypes 2 ♀♀,from forest soil,in Dunhua County (43°21′N,128°13′E),Jilin Province,Aug.1990,coll.MA Li-Ming.