Porifera Biology on the WWW
- A central clearinghouse for sponge researchers, including a porifera listserver bulletin board and who's who in sponge research.
- http://www.jiscmail.ac.uk/lists/PORIFERA.html

Sponge City
- Article by William Amos on sponges and their general biology, and the pistol shrimp and other creatures that live inside their chambers.
- http://www.microscopy-uk.org.uk/mag/artaug99/basponge.html

Underwater Field Guide to Sponges of Ross Island & McMurdo Sound, Antarctica
- Beautiful annotated photographs of sponges (Porifera) of Antarctica.
- http://scilib.ucsd.edu/sio/nsf/fguide/porifera.html

The Sponges of British Columbia
- Descriptions of sponges by Curt Smecher.
- http://www.interchg.ubc.ca/csmecher/sponge.htm

Khoyatan Sponge Page - Sponges of The Northeast Pacific
- Photographs of four Classes of sponges in the Khoyatan Marine Laboratory.
- http://mareco.org/spongepage/index.htm

Introduction to Porifera
- A good start on the biology of sponges, including phylogeny, life history, and ecology.
- http://www.ucmp.berkeley.edu/porifera/porifera.html

Hermit Crab Sponges
- An article by Floyd Sandford about the sponges that are carried around by hermit crabs.
- http://www.public.coe.edu/departments/Biology/hermit.html

Phylum Porifera (Sponges)
- Description of the sponges and their taxonomy, from the Animal Diversity Web.
- http://animaldiversity.ummz.umich.edu/porifera.html