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Comparative ultrastructure of eggs in Echinostoma paraensei, E. caproni, and E. trivolvis (Trematoda:
T Fujino1, T Nakano, H Washioka
1Department of Biology, Faculty of Science, Yamagata University, Japan.
Abstract:
The 37-collar-spined echinostomes Echinostoma paraensei, E. caproni, and E. trivolvis are digeneans that live in the intestine of small mammals and birds. Comparative studies of the eggs of these species were done using light microscopy (LM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The egg of E. caproni was the largest of the three species studied, whereas the egg of E. trivolvis was the smallest in both length and width. The SEM study showed differences in the aboperculum region of the eggs in all three species. The TEM study showed that the eggshell of all three species consisted of three layers, but no difference in eggshell structure was observed in any species.