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Taxonomy
Cardium subperobliquum was named by Riedel (1933). It is a 3D body fossil. Its type locality is Near Bombe, Mungo River, which is in a Coniacian carbonate limestone in the Mungo River Formation of Cameroon.
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