Parazoa display no body symmetry ( are asymmetrical ); all other animal groups display some sort of symmetry.
3.
It has been suggested that the evolutionary source of a single ancestral Kindlin protein is the earliest metazoa, the Parazoa.
4.
For a long time thereafter sponges were assigned to a separate subkingdom, Parazoa ( meaning " beside the animals " ).
5.
For multicellular animals it is very likely that the first ones-similar to modern sponges-had differentiated cell types but did not have differentiated organs; see Parazoa.
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