- A minute worm which 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
- Phyla Orthonectida and Rhombozoa; formerly placed together in the phylum Mesozoa, which was thought to be intermediate between protozoans and metazoans
- 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.
early 20th century: from modern Latin Mesozoa (from mesos 'intermediate' + zōion 'animal') + -an.
More definitions of mesozoanDefinition of mesozoan in:
- The US English dictionary