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).
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