What Is the Importance of Porifera?

Phylum Porifera, or the sponge, is entirely aquatic, with over 98 percent living in the ocean, and the rest living in freshwater lakes and streams, according to BioMedia Associates. The sponge serves an important purpose in filtering bacteria and other contaminants from water, and it forms a significant portion of coral reefs. Many sponges are brightly colored and come in a diverse array of shapes.