Genus: Biflagellate, both arising from anterior end; one directed anteriorly and the other runs backward
over body surface as a trailing (recurrent) flagellum; body plastic (Kudo, 1966).
Small (10-15 μm);
body is generally pyriform to cylindrical
except for an ameboid variable posterior (Illustrated Guide, 1985).
Images of collecting locality:
a small waterway at walking road along Kurome river, Kanayama-machi, Higashikurume city, Tokyo, Japan, April 20, 2008 by Y. Tsukii