|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 (Fragum) by Glenn (1904).
It was assigned to Cardium by Glenn (1904); to Cardiidae by Lamprell and Whitehead (1992); to Veneroida by Sepkoski (2002); and to Fraginae by Vokes (1980) and Bouchet et al. (2010).
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.