hemizonion

hemizonion
n. [Gr. hemisys, half; L. zona, girdle]
(NEMATODA: Secernentea)
A small nerve commissure slightly posterior to the hemizonid.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • cephalid — n. [Gr. kephale, head] (NEMATA) A nerve commissure of a highly refractive nature that extends from lateral cord to lateral cord ventrally or dorsally, anteriorly they extend from dorsal to ventral; see caudalid, hemizonid …   Dictionary of invertebrate zoology

  • hemizonid — n. [Gr. hemisys, half; L. zona, girdle] (NEMATODA: Secernentea) A nerve commissure from the nerve ring that is highly refractive at the point it joins the ventral nerve cord near the excretory pore; see cephalids, hemizonion, caudalid …   Dictionary of invertebrate zoology

  • parahemizonid — n. [Gr. para, beside; hemisys, half; L. zona, girdle] (NEMATODA: Secernentea) A hemizonion or other similar structure …   Dictionary of invertebrate zoology

  • NÉMATHELMINTHES — Les Némathelminthes, ou vers ronds, dont les plus grandes formes étaient connues bien avant l’ère chrétienne, n’ont suscité que tardivement la création d’une branche distincte en zoologie. L’étude de ces animaux est restée pour une large part… …   Encyclopédie Universelle

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