n. [Gr. 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 heteronereid.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • Epitoky — is a form of reproduction observed for polychaete marine worms. The worms undergo a partial or complete transformation into an epitoke, a pelagic morph capable of sexual reproduction. Often an epitoke is the posterior part of the worm, that… …   Wikipedia

  • annelid — /an l id/, n. 1. any segmented worm of the phylum Annelida, including the earthworms, leeches, and various marine forms. adj. 2. belonging or pertaining to the Annelida. Also, annelidan /euh nel i dn/. [1825 35; see ANNELIDA] * * * Any member of… …   Universalium

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  • Thelytoky — or thelytokous parthenogenesis is a type of parthenogenesis in which females are produced from unfertilized eggs. It is rare in the animal kingdom and has only been reported in about 1500 species. [White M (1984). Chromosomal mechanisms in animal …   Wikipedia

  • Nereididae — Nereidae Nereis succinea Scientific classification Kingdom …   Wikipedia

  • heteronereid — n. [Gr. heteros, different; Neris, family Nerididae] (ANNELIDA: Polychaeta) A specialized, free swimming, sexually dimorphic marine worm that gives off sex products into the water and dies after spawning; see epitoky …   Dictionary of invertebrate zoology

  • heteronereis — see epitoky …   Dictionary of invertebrate zoology

  • heterosyllid — see epitoky …   Dictionary of invertebrate zoology

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