meroplankton

[mer-uh-plangk-tuhn]
noun
a floating mass of eggs and larvae of organisms that are nektonic or benthic in their adult stage; temporary plankton.

Origin:
1905–10; back formation from meroplanktonic; see mero-, planktonic

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World English Dictionary
meroplankton (ˌmɛrəʊˈplæŋktən)
 
n
Compare holoplankton plankton consisting of organisms at a certain stage of their life cycles, esp larvae, the other stages not being spent as part of the plankton community

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Example sentences
Animals that only spend part of their lives in the plankton are called meroplankton.
Spring blooms occur for both meroplankton and holoplankton while fall blooms tend to be restricted to the holoplankton.
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