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Observation of the ultra-structure of the legs and external genitalia of two species of human Demodex
Author(s): 
Pages: 142-145
Year: Issue:  2
Journal: Acta Academiae Medicinae Shandong

Keyword:  MitesGenitaliaUltrastructureEnvironmental scanning electron microscopy;
Abstract: 目的用环境扫描电镜(ESEM)观察毛囊蠕形螨和皮脂蠕形螨足及外生殖器的超微结构,并讨论其分类意义。方法用刮片式及镊式取螨器从成人额部皮肤取出活螨,用显微操作技术清洗分离后1 h内用ESEM进行扫描、拍照。结果清楚地观察到两种人体蠕形螨足和外生殖器的超微结构。发现两种蠕形螨足爪的形态和数目、外生殖器的位置和外形均不同:毛囊蠕形螨的足较粗壮,有股距,每足跗节具双叉爪、三叉爪各1个,叉爪较钝,双叉爪后有一指向后方的爪距;雌螨阴门位于腹面第4对足水平正中,纵向裂缝状阴门与其前方的一弧形皱褶呈锚状;雄螨外生殖器位于背部4个背足体毛中央,阳茎呈毛笔头状可从生殖口伸出。皮脂蠕形螨足较细,无股距,足跗节的叉爪尖锐且数量和外形变异较大,无爪距;雌螨阴门位于腹面第4对足水平正中之后,纵向裂缝状阴门与其前后两条弧形皱褶呈"工"字形;观察50条皮脂蠕形螨未见雄性外生殖器。结论用环境扫描电镜观察人体蠕形螨,标本不需特殊处理,得到的图像清晰、饱满。足和外生殖器超微结构的不同对于两种蠕形螨有分类学意义。
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