Corculum cardissa, the heart cockle, is a species of marine bivalve mollusc in the family Cardiidae.

[2] Right and left valve of the same specimen: Corculum cardissa is often found lying on a surface of sand among coral debris and broken shells.

Within 24 hours of fertilisation, the veliger larvae have been observed to develop two valves and be swimming on the surface of the substrate.

A day later, they had undergone metamorphosis and had settled on the bottom as juveniles, miniature versions of the adult bivalves.

[2] Corculum cardissa and some other members of the family Cardiidae live in symbiosis with dinoflagellates in the genus Symbiodinium.

It has since been found however that, in response to the presence of Symbiodinium, a tertiary series of tubules develop from the walls of the digestive system and ramify through the tissues.

[3] This is analogous to the tertiary tubular system found in Tridacna and first described by Mansour in 1946,[4] but subsequently overlooked by other researchers.