DicerocardiidaeDicerocardiidae is an extinct family of fossil saltwater clams, marine heterodont bivalve molluscs, in the order Megalodontida.GeneraGenera within the family Dicerocardiidae: †Cornucardia Koken 1913 †Dicerocardium Stoppani 1856, the type genus †Physocardia Wahrmann 1894 †Platycardia Beringer 1949 †Pseudisocardia Douvillé 1912 †Pseudisocardia Macfadyeni Cox 1935 †Rostrocardia Freneix 1972