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.

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

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.