|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Trachycardium (Dallocardia) quadragenarium
Bivalvia - Cardiida - Cardiidae
It was recombined as Laevicardium quadragenarium by Delong (1941); it was recombined as Trachycardium quadragenarium by Powell and Stevens (2000); it was recombined as Trachycardium (Dallocardia) quadragenarium by Woodring (1982) and Coan et al. (2000).
|Year||Name and author|
|1837||Cardium quadragenarium Conrad|
|1907||Cardium quadrigenarium Arnold p. 535|
|1941||Laevicardium quadragenarium Delong|
|1982||Trachycardium (Dallocardia) quadragenarium Woodring p. 637|
|2000||Trachycardium (Dallocardia) quadragenarium Coan et al. pp. 361. 362|
|2000||Trachycardium quadragenarium Powell and Stevens|
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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.