
Pedinellales (or actinodines) is a group of heterokonts. These are found in both freshwater and marine environments, and most genera are sessile, attached by posterior stalks. The flagellum is at the anterior of the cell, and the tentacles surround it, often capturing small prey drawn in by its current. The colored genera are Pedinella, Apedinella...
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http://en.wikipedia.org/wiki/Pedinellales

(from the article `algae`) ...marine flagellates, including silicoflagellates that form skeletons common in diatomite deposits; fewer than 25 described species.Order ...
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http://www.britannica.com/eb/a-z/p/34
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