[hol-uh-plangk-tuhn, hoh-luh-]
plankton that spend their entire life cycle as free-swimming organisms (opposed to hemiplankton ).

holo- + plankton

holoplanktonic [hol-oh-plangk-ton-ik, hoh-loh-] , adjective
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World English Dictionary
holoplankton (ˌhɒləˈplæŋktən)
Compare meroplankton organisms, such as diatoms and algae, that spend all stages of their life cycle as plankton

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
holoplankton   (hŏl'ə-plāngk'tən, hō'lə-)  Pronunciation Key 
Plankton that remains free-swimming through all stages of its life cycle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Zooplankton can be divided into two sub-groups: holoplankton and meroplankton.
Spring blooms occur for both meroplankton and holoplankton while fall blooms tend to be restricted to the holoplankton.
In contrast, holoplankton spend their entire life as plankton, and include such organisms as copepods and large jellyfish.
Animals that spend their whole lives in the plankton are called holoplankton.
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