Megapitaria squalida, the chocolate clam, is a species of bivalve mollusc in the family Veneridae.

[7] These clams live buried in sandy sediments from the intertidal zone to 160 metres (520 ft) deep.

[6] In a study performed in Magdelena Bay, the average density was 2.01 individuals per square meter.

Hermaphrodites, individuals containing both types of sex organs, are present, and even common in some populations.

One study suggests that differing sex ratios and the amount of hermaphroditism in various populations may be the result of fishing pressures.

[10] Mexican fishery regulations require chocolate clams to exceed 80 millimetres (3.1 in) in length before they can be harvested.

Chocolate clams are eaten marinated on the half-shell, as ceviche, in chowders, baked, steamed, and in salads.