The name of Cardiidae derives from the Latin cardium, -ii and from the Greek kardia, heart. The shell, in fact, if viewed from the side remembers the shape of a heart. The appearance is robust, with two valves equal in both shape and color, generally provided outside of ribs. Several hundred species are widespread in the seas around the world. In the Mediterranean sea there are about twenty of them that inhabit shallow sandy bottoms, several of which are fished for food.