Mactra chinensisMactra chinensis is a species of saltwater clam, a marine bivalve mollusc in the family Mactridae, the trough shells.Distribution and habitatMactra chinensis is found living in sandy substrates in shallow marine habitats in Vietnam, Korea, Mainland China,The Philippines and Taiwan.As foodIn Japan, the clam is known as bakagai or aoyagi. The adductor muscle is called kobashira and is often eaten as sushi.