Description of the sponges and their taxonomy, from the Animal Diversity Web.

An article by Floyd Sandford about the sponges that are carried around by hermit crabs.

A good start on the biology of sponges, including phylogeny, life history, and ecology.

Photographs of four Classes of sponges in the Khoyatan Marine Laboratory.

A central clearinghouse for sponge researchers, including a porifera listserver bulletin board and who's who in sponge research.

Descriptions of sponges by Curt Smecher.

Beautiful annotated photographs of sponges (Porifera) of Antarctica.