Genus: Ovoid, firm; dorsal side convex, ventral side flattened; dorsal surface ridged;
adoral zone reduced or rudimentary; macronucleus U-shaped or in two rounded parts (Kudo, 1966).
Species: Cell body ovoid;
35 μm long;
outline and dorsal surface smooth (no ribs or thorn); 7 frontoventral,
5-6 transverse cirri; macronucleus horseshoe-shaped
(Carey, 1992).
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