Are sea clams the same as quohogs?

Question

Are sea clams the same as quohogs?

Answer 1

Quahogs are both the colloquial common name for Mercenaria mercenaria (the hard shell clam) as well as a specific size class for the hard shell clam.  Quahogs are generally the largest sized (>3 inches wide).  When they are smaller they are called Little Necks or Cherrystones (depending on the size).

Sea clam is just a general term that describes the many clam species that live in saltwater.

Answer 2

A Quahog is a particular species of a sea clam.  There are many other types of clam.