Genus: Ovoid, inhabiting a mucilaginous sac or lorica; vestibulum large and shallow, occupying
1/3 of ventral surface; on the right of the vestibulum lie a short row of long curved cilia;
a macronucleus; contractile vacuole subterminal (Carey, 1992).
Images of collecting locality:
Hazama marsh, Tomita, Ashikaga city, Tochigi Pref., Japan, April 22, 2006 by Y. Tsukii