nannoplankton

(nan′ō plaŋktən)

noun

planktonic organisms smaller than 40 microns in diameter
also sp. nanoplankton

Origin: < nano- + plankton

See nannoplankton in American Heritage Dictionary 4

also nan·o·plank·ton

noun
Plankton of minute size, especially plankton composed of organisms measuring from 2 to 20 micrometers.

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