
Metanauplius is an early larval stage of some crustaceans such as krill. It follows the nauplius stage. In sac-spawning krill,{#tag:ref|There are two kinds of spawning mechanisms in krill. Females of broadcast spawning species just release the fertilized eggs into the water, where they sink, disperse, and are on their own. In sac-spawning species,...
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• (n.) A larval crustacean in a stage following the nauplius, and having about seven pairs of appendages.
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(from the article `crustacean`) ...unsegmented body, three pairs of appendages (antennules, antennae, and mandibles), and a single simple nauplius eye. When the body becomes more ...
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http://www.britannica.com/eb/a-z/m/78

Later naupliar larvae of some crustaceans, i.e. after several naupliar stages but before another larval type or pre-adult in developmental sequence.
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Met`a·nau'pli·us noun [ New Latin See
Meta- , and
Nauplius .]
(Zoology) A larval crustacean in a stage following the nauplius, and having about seven pairs of appendages.
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http://www.encyclo.co.uk/webster/M/56
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