Authors: Hiroshi Sato Shuhei Tanaka Yumi Une Harumi Torii Mayumi Yokoyama Kazuo Suzuki Akiteru Amimoto Hideo Hasegawa
Publish Date: 2007/12/01
Volume: 102, Issue: 3, Pages: 541-546
Abstract
For the discrimination of the species of the genus Strongyloides the shape of the stoma in the apical view of parasitic females is the most important feature Microscopical interpretations divided the shape of the stoma into four groups simple angular complex and simple but with esophageal teeth however the stomas classified in the latter two groups in particular remained unclear In the present study parasitic females of eight representative Strongyloides spp with the angular stoma S procyonis and S martis complex stoma S robustus S callosciureus S planiceps S papillosus and S myopotami and stoma with esophageal teeth S ransomi were studied by scanning electron microscopy All species examined in this study having complex stoma or with esophageal teeth possessed at least four linguiform or verruciform projections submarginally in the stomal cavity Namely the number size shape and the site of attachment of intrastomal projections along with the depth of oral cavity determine a range of complex images of the stoma such as Xshaped or ornate stomas under light microscopy Similarly with the standard examination which usually uses a lateral view of the head erroneous interpretations of the number of lobes on the circumoral elevation of parasitic females might occur due to such intrastomal projections in some Strongyloides spp
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