Sponges are from the phylum porifera, named because of the many pores for filtering water, which is how they feed.
Sponges are asymetrical and have many special types of cells.
All the members of this phylum have radial symmetry. They also have cnidocytes, which are stinging cells used in capturing prey. The man of war is actually a colony of tiny hydrozoans. It feeds on fish which it captures in its tentacles.