Genus: A flattened ovoid or oblong, with longitudinal surface folds and
appearance of thickened 'pellicle'; hyaloplasm a crescent at anterior end with
thin extensions toward posterior end along sides; uninucleate (Page, 1976).
Images of collecting locality:
Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008 by Eizaburo Tsukii