美丽革伊螨重新描述(蜱螨亚纲:中气门目:土革螨科)

Redescription of Gamasiphis pulchellus based on specimens from China(Acari: Mesostigmata: Ologamasidae)

美丽革伊螨Gamasiphis pulchellus(Berlese, 1887)广泛分布于土壤中,并能捕食线虫。对采自西藏自治区亚东县苔藓、落叶、枯树皮、树洞土壤中美丽革伊螨的标本进行重新描述,主要描述前后若螨、雌螨和雄螨。

The protonymph, deutonymph, female and male of Gamasiphis pulchellus(Berlese, 1887) is redescribed in the present paper based on specimens collected from moss, falling leaves, death bark, soil from tree hole in Yadong County, Tibet Autonomous Region, China. It is widely distributed in soil for preying on nematode.Gamasiphis pulchellus(Berlese, 1887)(Figure 1~4)Female. Length of idiosom 483~517 μm(av. 494 μm), width 356~379 μm(av. 372 μm). Dorsal shield covering entire dorsum, also extending ventro-laterally, bearing 12 pairs of long setae and about 9 pairs of minute setae. Two pairs of presternal shields present. Sternal shield coalesced with metasternal shield, with strongly concave posterior margin. Sterno-metasternal shield with 4 pairs of setae, the 3 rd pair of setae moving to inside. Genital shield almost rounded anteriorly and truncated posteriorly, bears 1 pair of setae. Ventro-anal shield fuses with dorsal shield posteriorly, and with 8 pairs of setae except perianal setae. Ad minute and situated at level of posterior margin of anus, PA very long. Peritrematal shield separated from exopodal shield by a narrow but distinct strip of cuticle, peritreme thin. Tectum with a long medial projection and 2 short lateral ones. Movable and fixed digits of chela with 4 and 8 teeth respectively.Male. Length of idiosoma 483~517 μm(av. 498 μm), width 356~379 μm(av. 368 μm). Sterno-genital shield with 5 pairs of sternal setae, 1 pair of metasternal setae and 1 pair of genital setae. Spermatodactyl of chela and spurs of leg Ⅱ shown in Figure 2(B) and 2(C). Remaining characters as in the female.Material examined 12♀13♂,4 deutonymphs and 5 protonymphs, ex moss, leaf litter, withered bark, tree hole, from Yadong County(27°30′N, 88°56′E), Xizang Autonomous Region, 7-8 September, 2016.