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EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS
Definition:
Diatoms are algae of the Phylum Ochrista that lack flagella. They have
a jewel-like appearance. They play an extremely important role in
aquatic food webs in that they are the second most abundant component of
marine plankton (after blue-green algae).  
Reference:
Gould, J. and W.Keaton. 1996. Biological Science. W.W. Norton and Company. New
York, New York.
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