Aspects of this topic are discussed in the following places at Britannica.
...specialization.)
Superfamily Patelliformia
Brackish water or marine limpets with (Siphonariidae) gill-like structures or with a lung (Gadinidae).
Superfamily Amphibolacea
Operculum present; shell conical; with pulmonary cavity; brackish water; burrow in sand; 1...
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