zoea
noun
any of the free-swimming larva of certain crustaceans, as the crab, having rudimentary legs and a spiny carapace.
The grammatical form denoting more than one person, place, thing, or idea.
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All the different kinds of Crab begin life as larvae or zoeas, and cast their shells as we have seen.
From On the Seashore by R. Cadwallader Smith