Pneumostome
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A pneumostome is an opening in the right side of the mantle of a Pulmonata ordered or subclassed slug (suborder Stylommatophora) or snail, through which its single lung is connected. The frequency of pneumostome closing and opening is typically less than 0.5 closures per minute in fully hydrated slugs and snails. The rate of closures per second increases the more dehydrated the slug is.
Position of pneumostome in dirrerent families
 Arionidae (Arion ater) - pneumostome just before the mid-point of its mantle |
 Limacidae (Bielzia coerulans) - pneumostome just behind the mid-point of its mantle |
 Milacidae (Tandonia budapestensis) - pneumostome just behind the mid-point of its mantle |
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