known; includes Chrysochromulina, Emiliania, Phaeocystis, and Prymnesium. Class Raphidophyceae (Chloromonadophyceae) Flagellates with mucocysts (mucilage-releasing bodies) occasionally found in freshwater or marine environments; fewer than 50 species; includes Chattonella, Gonyostomum, Heterosigma
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