Clams, Cockles, and Pipis

Most of the familiar edible shellfish such as mussels, cockles, oysters, pipi and scallops belong to a group of molluscs known as bivalves. The term bivalve refers to their two hinged shells (technically valves). Both shells are usually of the same shape, as in mussels, but in oysters and scallops one is flat and one curved. Most bivalves are sedentary or slow-moving animals. Some, such as pipi and cockles, spend their life buried in seafloor sediment, while others like the oyster and mussel remain anchored to one spot.

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