A small phylum of about 50 species of parasites of marine invertebrates with complex life cycles. M. are classified with the Metazoa, but they are regarded by some observers as intermediate between unicellular and multicellular animals; others consider them a degenerate group of flatworms. M. are divided into two very distinct orders, the Orthonectida and Dicyemida; the latter are nephridial parasites of squids, octopods, and cuttlefish. [meso- + G. zoon, animal]

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Me·so·zoa .mez-ə-'zō-ə, .mēz-, .mēs-, .mes- n pl a phylum or other taxonomic group comprising the mesozoans

Medical dictionary. 2011.

Look at other dictionaries:

  • Mesozoa — Mes o*zo a, n. pl. [NL. See {Mesozoic}.] (Zo[ o]l.) A group of very lowly organized, wormlike parasites, including the Dicyemata. They are found in cephalopods. See {Dicyemata}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Mesozoa — Mesozoa, nur etwa 50 parasitisch lebende Arten umfassender Tierstamm; 0,5–7 mm groß, zweischichtig, häufig bewimpert; komplizierter mehrphasiger Entwicklungszyklus. M. parasitieren in Cephalopoden und verschiedenen anderen Meerestieren. Ihre… …   Deutsch wörterbuch der biologie

  • 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

  • Mesozoa — Los mesozoos (Mesozoa, animales intermedios ) fueron considerados como un filo del reino animal durante años. Asimismo, y dada su extrema simplicidad, se les consideró un eslabón evolutivo entre los Protistas y los Metazoos. Hoy en día, más que… …   Wikipedia Español

  • Mesozoa — Mésozoaires Tr …   Wikipédia en Français

  • Mesozoa — Für die systematische Einteilung der Lebewesen existieren neben und nacheinander verschiedene Vorschläge. Das hier behandelte Taxon entspricht nicht der gegenwärtig in der deutschsprachigen Wikipedia verwendeten Systematik oder ist veraltet. Als… …   Deutsch Wikipedia

  • Mesozoa — См. mesozoans …   Dictionary of invertebrate zoology

  • Mesozoa — /mez euh zoh euh, mes , mee zeuh , seuh /, n. Zool. the phylum of invertebrates comprising the mesozoans, parasitic wormlike multicellular organisms sometimes considered to be intermediate in complexity between protozoans and metazoans. [1875 80; …   Universalium

  • mesozoa — meso·zoa …   English syllables

  • mesozoa — …   Useful english dictionary

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