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Taxonomy
Pachycardium was named by Conrad (1869) [Sepkoski's age data: K l K Maes-u]. It is not extant.
It was reranked as Protocardia (Pachycardium) by Schneider (1995); it was reranked as Cardium (Pachycardium) by Kosnik (2002).
It was assigned to Cardiidae by Popenoe (1937); to Protocardiinae by Vokes (1980); to Protocardia by Schneider (1995); to Cardium by Kosnik (2002); and to Veneroida by Sepkoski (2002).
It was reranked as Protocardia (Pachycardium) by Schneider (1995); it was reranked as Cardium (Pachycardium) by Kosnik (2002).
It was assigned to Cardiidae by Popenoe (1937); to Protocardiinae by Vokes (1980); to Protocardia by Schneider (1995); to Cardium by Kosnik (2002); and to Veneroida by Sepkoski (2002).
Species lacking formal opinion data
Pachycardium stantoni, Protocardia africana, Protocardia amanoi, Protocardia barneyi, Protocardia beiha, Protocardia besairiei, Protocardia bipi, Protocardia contusa, Protocardia hillanum, Protocardia lycetti, Protocardia lycetti, Protocardia moshuiwanensis, Protocardia olea, Protocardia oxynoti, Protocardia parahillana, Protocardia peraltaensis, Protocardia pertenuis, Protocardia phillipiana, Protocardia phillipiana, Protocardia rahmuensis, Protocardia regulare, Protocardia schucherti, Protocardia spillmani, Protocardia subhillanum, Protocardia texana, Protocardia tosensis
Synonymy list
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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.
Subg. †Protocardia (Pachycardium) Conrad 1869
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†Pachycardium coronaensis Packard 1922
†Pachycardium remondianum Gabb 1864
Diagnosis
No diagnoses are available