porifera

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• - 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.
  
• - An article by Floyd Sandford about the sponges that are carried around by hermit crabs.
  
• - Description of the sponges and their taxonomy, from the Animal Diversity Web.
  
• - 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.
  
• - Beautiful annotated photographs of sponges (Porifera) of Antarctica.