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Taxonomy
Cardium (Trachycardium) ochilleanum was named by Stephenson (1956). Its type specimen is USNM 125010, a valve, and it is a 3D body fossil.
Sister species lacking formal opinion data
C. alabamense, C. cedrelarum, C. cottaldinum, C. erinaceum, C. heinzelini, C. hernandoense, C. hispidiforme, C. knappi, C. latisulcum, C. leucostoma, C. lineolatum, C. lithopodolicum, C. problematicum, C. rouyanum, C. scabrum, C. schweinfurthi, C. transcarpaticum, C. triangulatum, C. vindobonense, C. volckmanni, C. colosseum, C. estacianum, C. sellardsi, C. triboleti, C. hanpeizanense, C. anclotense, C. brooksvillense, C. coutinhoi, C. hernandoense, C. hortensium, C. leucostomum, C. plectopleura, C. ustrix, C. viridarii, C. colosseum, Pleurocardia longstreeti, Trachycardium denticostulatum, Trachycardium quadragenerium, Trachycardium sindense, Trachycardium lingualionis