Genus: Body ovoid, inflexible; ventral surface flattened, dorsal surface convex; peristome broadly triangular (Kudo, 1966). Cell body is ovoid, dorsoventrally flattened; dorsal surface may be equipped with some ornamentation; three groups of cirri (frontoventral, transverse & caudal); macronucleus C-shaped, "3"-shaped, or horsehoe-shaped (Carey, 1992).
Species: Large & ovoid; 145 μm long; with well-defined peristomial collar; dorsal surface sculptured with 8-10 grooves; peristome large, wide and triangular in shape, extending 2/3 cell length; 9 frontoventral, 5 transverse, 4 caudal cirri; macronucleus Y- or T- shaped (Carey, 1992).
intact cells
158 x 102 μm
Japan, 199?
intact cells
152 x 88 μm
Japan, 199?
Mac. & Mic.
157 x 88 μm
Japan, 199?
Autogamy ?
μm
Japan, 199?
