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Peristome
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==In shelled gastropods== [[File:Cepaea nemoralis unten.jpeg|thumb|The ventral surface of a shell of ''[[Cepaea nemoralis]]''. The peristome is thickened and dark in an adult snail.]] {{main|Lip (gastropod)}} The peristome is the margin of the [[Aperture (mollusc)|aperture]] of a [[gastropod shell]]. It is the edge of the lip of the shell. This part is sometimes reflected (turned back) or thickened once the snail reaches adult size, and these qualities of the peristome can be diagnostic features of the shell which may aid in identification of the species.
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