Animal Diversity Web: Gastropoda

Sponges are a diverse group of sometimes common types, with about 5000 species known across the world. Sponges are primarily marine, but around 150 species live in fresh water. Sponges have cellular-level organization, meaning that that their cells are specialized so that different cells perform different functions, but similar cells are not organized into tissues and bodies are a sort of loose aggregation of different kinds of cells. This is the simplest kind of cellular organization found among parazoans.

Publisher - University of Michigan

Subjects - Gastropda

http://animaldiversity.ummz.umich.edu/accounts/Gastropoda/

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Citation: Myers P, Burch JB. 2001. Animal Diversity Web: Gastropoda. Ann Arbor, MI: University of Michigan. http://animaldiversity.ummz.umich.edu/accounts/Gastropoda/