|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Bivalvia - Cardiida - Cardiidae
It was reranked as Corculum (Trigoniocardia) by Oinomikado (1939); it was reranked as Cardium (Trigoniocardia) by Pilsbry and Olsson (1941); it was reranked as Fragum (Trigoniocardia) by Clark and Durham (1946); it was reranked as Cardium (Trigoniocardium) by Richards (1953).
It was assigned to Corculum by Oinomikado (1939); to Fragum by Clark and Durham (1946); to Cardium by Pilsbry and Olsson (1941) and Richards (1953); to Fraginae by Vokes (1980) and Dockery (1982); and to Veneroida by Sepkoski (2002).
|Year||Name and author|
|1939||Corculum (Trigoniocardia) Oinomikado p. 628|
|1941||Cardium (Trigoniocardia) Pilsbry and Olsson p. 9|
|1946||Fragum (Trigoniocardia) Clark and Durham p. 62|
|1953||Cardium (Trigoniocardium) Richards p. 52|
|1980||Trigoniocardia Vokes p. 128|
|1982||Trigoniocardia Dockery p. 72|
|2002||Trigoniocardia Sepkoski, Jr.|
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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.