Etymology:- From the Greek Plakos for flat and Zoon for animal,
hence Placozoa is a flat animal.
Characteristics of Placozoa:-
1)Has no symmetry or constant shape.
2)Has no distinct tissues or organs.
3)Has no nervous system.
4)Has no body cavity or digestive cavity.
5)Body is shaped like a flat disc.
6)Body consists of a two layers of single cells.
7)Lives in marine environments.
8)One species only known Trichoplax adhaerens.