SYNOPSIS. Scanning electron microscopy was used to reveal detailed surface structure of 4 septate (Gregarina cuneata, G. steini, G. rhyparobiae, Pileocephalus blaberae) and one aseptate species (Nematocystis elmassiani) of eugregarines. The epicyte of all these gregarines is differentiated into a system of regular longitudinal folds. In the septate species these folds undulate so that these organisms glide along. The undulatory pattern is absent from Nematocystis, which does not glide. The theories and the mechanism of gregarine gliding are discussed.
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Vávra et al. (1969) studied this question.
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