Genus: Protoperidinium | Dinoflagellate
Monterey Bay species: P. oceanicum, P. conicum, P. divergens, P. crassipes, P. steinii, P. excentricum. P. depressum
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Description: Armored cell of variable shape. Many species have apical and antapical horns and/or antapical spines. Chloroplasts absent in most species.
Cell Size: Variable from < 50um to > 100um
Distribution: Widespread throughout the world's oceans.