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Molluscs

> Bivalves | Gastropods | Cephalopods | Other Molluscs

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(115 total)

Actinostrea travisana
Actinostrea travisana
© 1998 Dr. Richard Paselk, Humboldt State University Natural History Museum

Crassostrea viginica
Crassostrea viginica
© 2005 Yale Peabody Museum


Arca wagneriana
© 2008 Tom Maier

What are Molluscs? One of the largest and most diverse groups, the Mollusca includes the easily recognizable clams, slugs, snails, and squid, as well as less familiar animals such as chitons, tusk shells, and monoplacophorans. The extinct ammonites and belemnites are also molluscs. All molluscs possess a mantle, a sheath of tissue formed from the body wall. Most have a shell made of calcium carbonate that is secreted by the mantle. Molluscs can be found on land, as well as in freshwater and marine environments, from tide pools to the deep ocean trenches.

First known fossil occurrence: Cambrian.

Last known fossil occurrence: Quaternary. This group has living relatives.

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