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).
No mariginal or caudal cirri; common genus (Carey, 1992).
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
