any of a class (Orthonectida) of rare wormlike parasites of various marine invertebrates, including bivalved mollusks and polychaete annelids; they are usually included in the phylum Mesozoa, a group regarded as intermediate between protozoans (single-celled animals) and metazoans (multicellular animals) in organization. See mesozoan.

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Universalium. 2010.

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  • Mesozoa — The Mesozoa are enigmatic, minuscule, worm like parasites of marine invertebrates. It is still unclear as to whether they are degenerate platyhelminthes (flatworms) or truly primitive, basal metazoans. Generally, these tiny, elusive creatures… …   Wikipedia

  • mesozoan — /mez euh zoh euhn, mes , mee zeuh , seuh /, Zool. n. 1. any member of the phylum Mesozoa. adj. 2. of or pertaining to the mesozoans. [MESOZO(A) + AN] * * * ▪ marine invertebrate       any of approximately 50 species of small, ciliated,… …   Universalium

  • Ciliocincta — Ciliocincta …   Wikipédia en Français

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