nannoplankton
American Heritage Dictionary:
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nan·no·plank·ton
also nan·o·plank·ton (năn'ə-plăngk'tən) 
n.
Plankton of minute size, especially plankton composed of organisms measuring from 2 to 20 micrometers.
n.
Plankton of minute size, especially plankton composed of organisms measuring from 2 to 20 micrometers.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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