|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Bivalvia - Cardiida - Cardiidae
It was reranked as Cardium (Protocardium) by McCoy (1877); it was reranked as Cardium (Protocardia) by Gabb (1881) and Scholz et al. (2008); it was corrected as Protocardia by Ronchetti (1970), Vokes (1980), Schneider (1995), Bouchet et al. (2010) and Ros-Franch et al. (2014).
It was assigned to Cardium by McCoy (1877) and Gabb (1881); to Veneroida by Sepkoski (2002); to Protocardiinae by Vokes (1980), Vokes (1980), Schneider (1995) and Bouchet et al. (2010); and to Cardiidae by Ronchetti (1970), Scholz et al. (2008) and Ros-Franch et al. (2014).
|Year||Name and author|
|1877||Cardium (Protocardium) McCoy p. 16|
|1881||Cardium (Protocardia) Gabb p. 344|
|1970||Protocardia Ronchetti p. 61|
|1980||Protocardia Vokes p. 129|
|1980||Protocardium Vokes p. 129|
|1995||Protocardia Schneider p. 339|
|2002||Protocardium Sepkoski, Jr.|
|2008||Cardium (Protocardia) Scholz et al.|
|2010||Protocardia Bouchet et al.|
|2014||Protocardia Ros-Franch et al.|
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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.