Abstract
The gut epithelia of six species of digenetic trematodes, Clonorchis sinensis, Eurytrema pancreaticum, Haematoloechus lobatus, Echinostoma hortense, Schistosoma japonicum and Fasciola hepatica, were studied with scanning and also transmission electron microscopy. Morphological differences in cytoplasmic projections of the gut of adult flukes were demonstrated stereoscopically among these species. The cytoplasmic projections vary considerably in shape, but are roughly separated into three groups by their essential forms: ribbon-shaped narrow type in C. sinensis and E. pancreaticum, broad, triangular with filamentous extensions distally and/or marginally as in F. hepatica and E. hortense, and broad, sheet-like or triangular with the distal ends blunt or rounded as in H. lobatus and S. japonicum. This character appears rather constant, without regional differences in the gut. No marked correlation was found between the gut projections of the parasites and their host or food. There are also specific discriminations in the ultrastructure of the cellular organization among the species examined.
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