![]() Gastropods that naturally lack a shell, or have only an internal shell, are mostly called slugs, and land snails that have only a very small shell (that they cannot retract into) are often called semi-slugs. When the word "snail" is used in this most general sense, it includes not just land snails but also numerous species of sea snails and freshwater snails. ![]() ![]() ![]() However, the common name snail is also used for most of the members of the molluscan class Gastropoda that have a coiled shell that is large enough for the animal to retract completely into. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. Helix pomatia sealed in its shell with a calcareous epiphragmĪ snail is, in loose terms, a shelled gastropod.
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