巨螯螨属二新种记述(蜱螨亚纲,革螨股,巨螯螨科)

ON TWO NEW SPECIES OF THE GENUS MACROCHELES (ACARI,GAMASINA,MACROCHELIDAE)

记述巨螯螨属 2新种 :神农架巨螯螨Macrochelesshennongjiaensissp .nov .和金丝燕巨螯螨Macrochelescol localiaesp .nov .,模式标本存于军事医学科学院微生物流行病研究所医学昆虫标本馆。

Two new species of the genus Macrocheles are described in the present paper.Type specimens are deposited in the Institute of Microbiology and Epidemiology,Academy of Military Medical Science,Beijing.1 Macrocheles shennongjiaensis sp.nov.(Figs.1-7)♀.Idiosoma 1115-1321(av.1199)μm long and 666-850(av.774)μm wide.Dorsal shield 1069-1092(av.1084)μm long and 609-643(av.624)μm wide;with many circular tubercles along margins,reticulated on surface.Dorsal shield bearing 28 pairs of setae,most of them brush-like,but F 2,D 3-D 6,I 1 and S 8 simple.F 1 closed to each other,F 2 slightly shorter than F 1,D 3 situated behind level of D 2.Sternal shield reticulated,with 3 pairs of simple setae and 2 pairs of pores. MSt and the 3rd pair of pores on metasternal shields.Genital shield reticulated,with 1 pair of simple setae.Ventro-anal shield reticulated,with 3 pairs of simple preanal setae and 3 perianal setae.Ad situated at level of anterior margin of anus,longer than PA. 3 pairs of sclerites between genital and ventro-anal shields.Metapodal shields 1 pair.Tectum,ventral view of gnathosoma,tarsus Ⅱ and Ⅳ shown in Figs.4-7. The new species is similar to Macrocheles tridentinus (G.et R.Canestrini,1882)and M.carinatus(Koch,1839),but in the new species F 2 slightly shorter than F 1,D 2 brush-shaped,ventro-anal shield narrower and longer,lateral projections of tectum complete;in M.tridentinus F 2 equal to F 1 in length,D 2 faintly pilose,ventro-anal shield broader and shorter;F 2 of M.carinatus distinctly shorter than F 1,ventro-anal shield broader and shorter,lateral projections of tectum bifurcated. Holotype ♀,paratypes 2♀♀,collected off Ochotona thibetana from Shennongjia(31°15′N, 109°56′E),Hubei Province,about 2900m,25 June 1990.2 Macrocheles collocaliae sp. nov.(Figs.8-14)♀.Idiosoma 942-965(av.954)μm long and 586-609(av.597)μm wide,dorsal and ventral cuticles rough,densely covered with curves and sharp denticles.All shields with reticulations composed of punctations.Dorsal shield 908-919(av.913)μm long and 529-552(av.540)μm wide,bearing 30 pairs of setae,except for F 2,D 3-D 7,I 1 and S 8 simple,other setae brush-shaped,F 1 close to each other,F 2 distinctly shorter than F 1,D 3 situated at the same level of D 2.Sternal shield with 3 pairs of simple setae and 2 pairs of pores.Metasternal shields with MSt and the 3rd pair of pores.Genital shield with 1 pair of simple setae.Ventro-anal shield with 3 pairs of simple preanal setae and 3 perianal setae,Ad situated before level of anterior margin of anus,longer than PA.metapodal shields 1 pair.Tectum shown in Fig.11.One of palptrochanter setae shaft-like with membrane at end,another one short.Tarsus Ⅱ-Ⅳ with stout setae,simple or pilose. The new species is similar to Macrocheles jiangsuensis Meng et Sun,1990,but the new species ha- ving 30 pairs of setae on dorsal shield,D 2 brush-shaped,metapodal shields larger;the latter species only having 28 pairs of dorsal shield setae,D 2 simple,metapodal shields small. Holotype ♀ ,paratype 1♀,collected from nest of Collocalia brevirostris,in juncture(30°07′N,110°54′E) of Houhe Natural Reserve,Wufeng County,Hubei Province and Hupingshan Natural Reserve,Shimen County,Hunan Province,about 1700m,16 Apr.2000.