Bivalvia - Cardiida - Cardiidae
Alternative spellings: Cardium (Trachycardium), Laevicardium (Trachycardium)
Parent taxon: Cardiidae according to D. Frassinetti and V. Covacevich 1999
Sister taxa: Austrocardium, Cerastoderma, Didacna, Dochmocardia, Goethemia, Granocardium, Hemicardium, Indocardium, Laevicardium, Lahilliinae, Nemocardium, Neocardiids, Obsoletiforma, Papillicardium, Papyridea, Paradacna, Parvicardium, Parvidacna, Pascoella, Patagonicardium, Perucardia, Plagiocardium, Pleuriocardia, Pontalmyra, Protocardiinae, Pseudocatillus, Ringicardium, Sawkinsia, Serripes, Stylodacna, Trachycardiinae, Vietnamicardium
Subtaxa: Cardium (Trachycardium) greenhoughi, Cardium (Trachycardium) minbuense, Cardium (Trachycardium) protosubrugosum, Cardium (Trachycardium) riachuelense, Cardium (Trachycardium) sindiense, Trachycardium (Dallocardia), Trachycardium (Mexicardia), Trachycardium (Phlogocardia), Trachycardium (Trachycardium), Trachycardium cotteri, Trachycardium enode, Trachycardium eufaulensis, Trachycardium eversum, Trachycardium halaense, Trachycardium kinsmarae, Trachycardium lacunosum, Trachycardium mollyni, Trachycardium multiradiatum, Trachycardium muricatum, Trachycardium planicostata, Trachycardium puelchum, Trachycardium thalassium
Ecology: facultatively mobile infaunal suspension feeder