Interesting find

The heart-shaped clam we found today is known as a Heart Cockle or True Heart Cockle (Corculum cardissa).


The reason why it's so flat unlike the normal cockles we eat is 'cos it evolved in such a way that its shell flattened out, and became thin enough for sunlight to penetrate through. It needs sunlight because of the symbiotic relationship it has with zooxanthellae, which isn't very common in cockles except for rare bivalves like the Giant Clam.

That's all I could find out about it, 'cos everything else I searched for online was in undecipherable scientific gibberish... So I don't know if it can be eaten, or if its rare or endangered, though it seems to be quite common in the Philippines.