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Littleneck clams; they are Mercenaria mercenaria.

A clam is a type of shellfish. Clams can be found in saltwater and freshwater. This is a common usage term, and so includes quite a variety of shellfish. Clams are a fairly common form of bivalve, therefore making it part of the phylum Mollusc. There are many clams in the ocean, but some can also be found in some lakes, streams, and rivers.