Gastropod
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Gastropods are a vast and diverse group of invertebrates within the phylum Mollusca, comprising the animals commonly known as snails and slugs. With an estimated 65,000 to 80,000 living species, they
Cepaea nemoralis: a European pulmonate land snail, which has been introduced to many other countries
The shell of Zonitoides nitidus, a small land snail, has dextral coiling, which is typical (but not universal) of gastropod shells.
The shell of Physella acuta, a freshwater snail, which is left-coiling (sinistral).
Gastropod classification
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This overview lists proposed changes in the taxonomy of gastropods at the family level and above. There have been many changes in the way various groups of snails and slugs are classified.
Live limpets in the intertidal zone in Cornwall, England.
The shell of an archaeogastropod from the Pliocene of Cyprus. A serpulid worm is attached.
Cochlodina laminata from the family Clausiliidae or door snails, a small land pulmonate which has a sinistral or left-handed shell, on the trunk of a tree, in woodland, England
A group of live Patella vulgata, true limpets (common name for Patellogastropoda), on a rock in Wales