Pelagophyceae Group contains autotrophic, heterotrophic, and mixotrophic taxa. Most are marine and have a paraxial rod in the hairy flagellum. Silicoflagellates form a successful group of marine phytoplankton. Raphidophyceae Flagellated unicells that possess peripherally aligned trichocysts and chloroplasts; some possess many plastids (20–100).
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