|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Bivalvia - Cardiida - Cardiidae
It was reranked as Trachycardium (Agnocardia) by Vokes (1939); it was reranked as Bucardium (Agnocardia) by Schneider (2002); it was reranked as Acanthocardia (Agnocardia) by Moore (2002).
It was assigned to Trachycardium by Vokes (1939); to Cardiinae by Dockery (1982) and Vokes (1984); to Cardiidae by Todd (2001); to Veneroida by Sepkoski (2002); to Acanthocardia by Moore (2002); and to Orthocardiinae by Schneider (2002).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.