metazoan


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Related to metazoan: Myxozoan, Bilaterian

metazoan

(mĕt′ə-zō′ən)
n.
Any of numerous heterotrophic eukaryotic organisms of the kingdom Metazoa, characteristically having a multicellular body with cells differentiated into tissues; an animal.

met′a·zo′al, met′a·zo′an (met′a·zo′ic) adj.

metazoan

A multicellular “animal”.

metazoan

any animal of the group Metazoa, whose bodies are multicellular, as distinct from the PROTOZOANS where the bodies are unicellular. Sponges (see PARAZOAN).are the only nonprotozoan group excluded from the Metazoa. Most metazoans (except COELENTERATES) have a three-layered body structure with an outer ECTODERM, a middle MESODERM and an inner ENDODERM.

metazoan

member of the zoological division of Metazoa.
References in periodicals archive ?
Though some metazoans, such as helminths, are known to carry two functional copies of the 18S gene with differing sequences (Carranza et al.
Structural and functional diversification of AHRs during metazoan evolution
Endosymbionts observed on histological examination included Rickettsia-like organisms (RLOs) in the ctenidia (n = 246); an unidentified metazoan parasite in the siphon epithelium (n = 220); and microsporidia-like species in the intestine (n = 103), siphon muscle (n = 28), and ova (a Steinhausia-Wke parasite; n = 99).
Diversity of metazoan ovaries and vitellogenic mechanisms-implications for life history theory.
Biologists, zoologists, marine scientists, pathologists, fish health specialists, and other scientists from around the world cover protozoan and metazoan parasites that cause disease or mortality in economically important fish and discuss their clinical signs, diagnosis, external/internal lesions, pathophysiology, and protective and control strategies.
Metazoan organisms such as sponges, serpulids and other living creatures dominated the reefs.
This was a stunning discovery because previously it was thought that the urea cycle originated with the metazoan (animal) branch of life where it has played an important role in facilitating a wide range of physiological innovations in vertebrates.
A sampling of the chapter topics includes the relation between retrotransposons and their metazoan hosts, endogenous retroviruses, retroviral entry and uncoating, reverse transcription and integration, assembly and release, retroviral restriction factors, and HTLV and HIV.
However, the Ames test is not a suitable model for the mutagenesis of metazoan cells, and thus may yield false-positive and false-negative results (Ashby and Styles 1978).
The 5th edition of Ash and Orihel's Atlas of Human Parasitology is a superb, up-to-date compendium of protozoan and metazoan parasites.