Definition of mesozoan in English:

mesozoan

Syllabification: mes·o·zo·an
Pronunciation: /ˌmezəˈzōən, ˌmē-
 
/

noun

Zoology
A minute worm that is an internal parasite of marine invertebrates. It lacks any internal organs other than reproductive cells, and dissolved nutrients are absorbed directly from the host’s tissues.
More example sentences
  • The major group of mesozoans, the Dicyemida, live as microscopic parasites in the renal organs of squid and octopuses.
  • The dicyemid mesozoans, once hypothesized to be non-bilaterian metazoans, have since been shown to possess central class Hox genes indicating that these enigmatic parasites are secondarily simplified bilaterians.
  • Hox evidence has also placed dicyemid mesozoans in the clade.

Origin

early 20th century: from modern Latin Mesozoa (from mesos 'intermediate' + zōion 'animal') + -an.

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