|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Bivalvia - Cardiida - Cardiidae
It was reranked as Cardium (Protocardium) by McCoy (1877); it was corrected as Protocardia by Ronchetti (1970), Vokes (1980) and Schneider (1995); it was reranked as Cardium (Protocardia) by Gabb (1881) and Scholz et al. (2008).
It was assigned to Cardium by McCoy (1877) and Gabb (1881); to Protocardiinae by Vokes (1980), Vokes (1980) and Schneider (1995); to Veneroida by Sepkoski (2002); and to Cardiidae by Ronchetti (1970) and Scholz et al. (2008).
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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.