The hard clam (Mercenaria mercenaria), also known as a quahog (or quahaug), round clam, or hard-shell (or hard-shelled) clam, is an edible marine bivalve mollusk which is native to the eastern shores of North America, from Prince Edward Island to the Yucatán Peninsula. It is one of many unrelated edible bivalves which in the United States are frequently referred to simply as clams, as in the expression "clam digging". Older literature sources may use the systematic name Venus mercenaria; this species is indeed in the family Veneridae, the venus clams.
Confusingly, the "ocean quahog" is a different species, Arctica islandica, which, although superficially similar in shape, is in a different family of bivalves: it is rounder than the hard clam, usually has black periostracum, and there is no pallial sinus in the interior of the shell.
Other articles related to "quohog":
... Clams bought from a market should always be safe, as commercial harvesters are extremely careful about red tides They close beds that are even remotely threatened and keep them closed for up to three or four weeks after they are clean of any red tide ... Commercial clam fishers who are known to break these rules will receive a major fine in the first instance and will most likely have their license to harvest or sell clams revoked furthermore they are liable for any damages ...