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Molluscs

> Bivalves | Gastropods | Cephalopods | Other Molluscs

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(115 total)

Argopecten revellei
Argopecten revellei
© 2009 Ana Luisa Carreno

Orthoceras
Orthoceras
© 2003 Thomas Kammer

Mercenaria mercenaria
Mercenaria mercenaria
© 2005 Yale Peabody Museum

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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