Mesozoa
Radiata
Bilateria
</table>
The
Mesozoa are
animals without a full metazoan organization. At one time they were classified as a
phylum, but are now generally believed to be unrelated to one another, so the term mesozoan is applied descriptively rather than taxonomically. The two main mesozoan groups are the
Rhombozoa and
Orthonectida.
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