epitoky

From ZooTerms (Dictionary of Invertebrate Zoology)
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epitoky (noun; Greek epi, upon; tokos, birth): (Annelida: Polychaeta) Reproduction of certain dimorphic swarming worms in which structural modifications such as enlarged eyes, nonfunctional gut and modification of parapodia for swimming occur; also called hetero-forms: heteronereis, heterosyllid

See also: heteronereid.