Nauplius (larva)
From Freepedia
A nauplius is the larva of many kinds of crustaceans. It consists of a head and a telson; the thorax and abdomen have not developed yet. It has three pairs of appendages with which it swims; these become, in the adult, the antennules, the antennae, and the mandibles.
See also
Other developmental stages of crustaceans are:
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