Phylum placozoa, Biology

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Phylum Placozoa

The phylum Placozoa contains a single species of a minute marine animal Trichoplax adharens composed of a dorsal and ventral epithelial layer enclosing loose mesenchyme like cells. Mesozoans comprise some 50 species of small parasitic worms that have simple structures made up of 20-30 ciliated cells covering a few reproductive cells.


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