柳氏仿胭螨重新描述和鸭绿江仿胭螨及白氏枝厉螨特征补充(蜱螨亚纲:革螨股:胭螨科)

Redescription of Rhodacarellus liuzhiyingi and Supplemental Characters of Rhodacarellus yalujiangensis and Dendrolaelaps baixuelii(Acari:Gamasina:Rhodacaridae)

本文对柳氏仿胭螨RhodacarellusliuzhiyingiMa,1995重新描述,并对鸭绿江仿胭螨RhodacarellusyalujiangensisMa,2003及白氏枝厉螨DendrolaelapsbaixueliiMa,1997的特征进行补充。

1 Rhodacarellus liuzhiyingi Ma,1995 (Figs.1-10)♀. Length 609-666 (av.625)μm, width 310-345 (av.322)μm. Anterior dorsal shield bearing 18 pairs of setae, F-setae 3 pairs; peritrematal shields with 2 pairs of setae, anothers 2 pairs on cuticle outside the shield; 4 chitinous pore-like structures small, circular. Posterior dorsal shield with granular region and antero-medial hole at anterior part, postero-lateral margins extending to venter, 19 pairs of setae inserting on the shield. Dorsal setae simple, relative lengths as in fig.1.Posterior margin of sternal shield concave,1 pair of presternal line regions and St_1on cuticle before the shield; St_2,St_3and MSt on the shield, of which the former 2 pairs of setae slightly stout; pores 3 pairs, the first pair situated at anterior margin of the shield. Genital shield hatchet-shaped, with 1 pair of setae. Ventro-anal shield expanded into circular at posterior part, with 3 pairs of preanal setae, Ad situated at level of anterior margin of anus, longer than anus, PA shorter than Ad. Ventral cuticle setae 4 pairs, the last pair longer. Metapodal shields banana-shaped, with a anterior thread. Peritreme reaching to middle of coxa Ⅰ anteriorly. Michael's organ distinct, sacculus bifurcate. Tectum with 3 slender tines. Movable and fixed digits of chela with 1 row of denticles respectively. Both leg Ⅲ and Ⅳ with spines on femora and genua. . Length 517-563 (av.543) μm, width 276-322 (av.296) μm. Anterior dorsal shield with 22 pairs of setae,Posterior dorsal shield with 20 pairs of setae,both sides 3 pairs often moved to venter. St_1 situated at presternal region, St_2, St_3and MSt on sternal shield, genital setae on 2 triangular sclerites. Anterior protrusion of ventro-anal shield triangular, preanal setae 7 pairs, the last pair longer. Spermatodactyl of chela shown in fig.9.Leg Ⅱ with a large spur on femur and a small spur on genu, tibia and tarsus respectively. Specimens 63♀♀ and 4 ,under decomposed bark of poplar, from Baicheng (45° 37′ N,122° 49′ E),Jilin Province, Aug.14,2002.2 Rhodacarellus yalujiangensis Ma, 2003 (Figs. 11-13)Supplementary characters. Metapodal shields of female and deutonymph triangular, with slender anterior projection. Both dorsal shields of deutonymph reticulated strongly, pattern on posterior dorsal shield shown in fig.12.Setae D_7distinctly longer than D_8. Specimens 4♀♀ and 7 deutonymphs, under decomposed bark, from Linjiang County (41° 50′ N,126° 51′ E),Jilin Province, June 15, 2003. 3 Dendrolaelaps baixuelii Ma, 1997(Figs.14-15)♀(Corrections of characters). Idiosoma with 2 pairs of long setae at posterior margin. Ventro-anal shield rectangular, anal region expanded, preanal setae 3 pairs, anterior pair of which laying at lateral margins. Ventral cuticle setae 4 pairs around ventro-anal shield, the last pair longer. Specimen after holotype.