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Scrippsiella trochoidea (F.Stein) A.R.Loeblich III, 1976

The cells are elongated or rounded pear-shaped, not flattened dorsoventrally. The transverse groove ...

Protoperidinium granii (Ostenfield, 1906) Balech, 1974

The cells are wide. Epivalva and hipovlava are almost the same size. The transverse groove is curved...
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