
1) Parasitic animal 2) Tiny marine parasites
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https://www.crosswordclues.com/clue/mesozoa

The Mesozoa are enigmatic, minuscule, worm-like parasites of marine invertebrates. {As of|2012} it was still unclear whether they are degenerate platyhelminthes (flatworms) or truly-primitive, basal metazoans. Generally, these tiny, elusive creatures consist of a somatoderm (outer layer) of ciliated cells surrounding one or more reproductive cells...
Found on
http://en.wikipedia.org/wiki/Mesozoa

• (n. pl.) A group of very lowly organized, wormlike parasites, including the Dicyemata. They are found in cephalopods. See Dicyemata.
Found on
http://thinkexist.com/dictionary/meaning/mesozoa/
Mes`o·zo'a noun plural [ New Latin See
Mesozoic .]
(Zoology) A group of very lowly organized, wormlike parasites, including the Dicyemata. They are found in cephalopods. See
Dicyemata .
Found on
http://www.encyclo.co.uk/webster/M/53

Type: Term Pronunciation: mez-ō-zō′ă Definitions: 1. A small phylum of about 50 species of parasites of marine invertebrates with complex life cycles. Mesozoa are classified with the Metazoa, but they are regarded by some observers as intermediate between unicellular and multicellular animals; others consider them a degenerate ...
Found on
http://www.medilexicon.com/medicaldictionary.php?t=54526

Mesozoa The phylum of invertebrates comprising the mesozoans, parasitic wormlike multicellular organisms sometimes considered to be intermediate in complexity between protozoans and metazoans.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1299/5
No exact match found.