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Gastropoda

A Dictionary of Zoology | 1999 | | © A Dictionary of Zoology 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

Gastropoda (gastropods; phylum Mollusca) A class of molluscs, of asymmetrical form, including snails and slugs, which have a true head, an unsegmented body, and a broad, flat foot. When present, the shell is in one piece and spirally coiled, at least in young stages. The mantle cavity and visceral mass have undergone torsion, at least in the developmental stage. There is usually a well-developed radula. Gastropods inhabit a wide range of aquatic and terrestrial environments, and range from the Cambrian to the present. Fossils of coiled gastropod shells are common in marine rocks, especially those of the Cenozoic. All fossil gastropods and most modern ones have a coiled shell, which is all that remains for the identification of fossil forms. The identification of modern species is based largely on soft body parts.

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