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Subclass Opisthobranchia
no specimens, fully marine, no shell, external gills or just one gill, sea slugs
Subclass Pulmonata
have lungs, freshwater, have shells
Subclass Prosobranchia
all consequent organisms are under this subclass, one shell, has an operculum for sealing the shell divided into three orders: Archaeogastropoda, Caenogastropoda, Neogastropoda
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