Meretrix lyrata

Meretrix lyrata, the lyrate Asiatic hard clam, also known simply as the hard clam, is an edible saltwater clam, a marine bivalve mollusc in the family Veneridae, the Venus clams.
This species occurs along the coasts of Vietnam, Taiwan, the Philippines, Sarawak and South China.

Right and left valve of the same specimen:

Culinary use

In Vietnam, these hard clams are eaten boiled, steamed or roasted. They are an important export in the eastern and southern parts of Vietnam.