The Atlantic surf clam (Spisula solidissima ), also called the bar clam, hen clam, skimmer or simply sea clam, is a very large, edible, saltwater clam or marine bivalve mollusk in the family Mactridae. It is commonly found in the western Atlantic Ocean. Reaching up to 20 centimetres (7.9 in) or more in length, it is much larger than Spisula solida, which resides in the eastern Atlantic coastal waters.
The shell of this species is a well-known object to beach-goers in the northeastern United States. People on the beach often pick up a large empty shell of this species, either to dig in the sand with, or take home to use as a decorative dish or ashtray.
The species is exported commercially as a food item.
This common species occurs off the east coast of North America from Nova Scotia to South Carolina.
It has also been introduced and farmed in Hokkaidō, northern Japan.
Atlantic surf clams live buried in coarse or fine sand. They live offshore as well as in the low intertidal and surf zones.
Surf clams can take as little as three months to reach maturity off the New Jersey coast, or as long as four years off Nova Scotia, and can reach an age of 31 years.
These clams use their siphons to pull in and then filter fine particles of organic matter and plankton from the surrounding seawater. Like almost all clams, they are filter feeders.
