Page "Placozoa" Paragraph 1

Trichoplax is a small, flattened, animal around 1 millimetre across.

Like an Amoeba, it has no regular outline, although the lower surface is somewhat concave, and the upper surface is always flattened.

The body consists of an outer layer of simple epithelium enclosing a loose sheet of stellate cells resembling the mesenchyme of some more advanced animals.

The epithelial cells bear flagella, which the animal uses to help it creep along the seafloor.