Here are some USGS Web pages with more information on sponges and Anywhere:
Nonindigenous Sponge Distribution Information
Descriptions and examples of deleterious effects of nonindigenous species with links to distribution maps, species lists and related information.
(Score: 0.690)
Definition:
Many-celled aquatic invertebrate belonging to the phylum Porifera and characterized by an internal skeleton composed most frequently of opaline silica and less commonly of calcium carbonate. [Glossary of Geology, 4th ed.]