Bivalvia - Cardiida - Cardiidae
Alternative spellings: Cardium (Mexicardia), Mexicardia
Full reference: R. B. Stewart. 1930. Gabb's California Cretaceous and Tertiary type lamellibranchs. The Academy of Natural Sciences of Philadelphia Special Publication 3:1-314
Parent taxon: Trachycardium according to H. E. Vokes 1989
See also Pilsbry and Olsson 1941, Sepkoski 2002 and Woodring 1982
Sister taxa: Cardium (Trachycardium) greenhoughi, Cardium (Trachycardium) mamillatum, Cardium (Trachycardium) minbuense, Cardium (Trachycardium) polycolpatum, Cardium (Trachycardium) protosubrugosum, Cardium (Trachycardium) riachuelense, Cardium (Trachycardium) sindiense, Trachycardium (Phlogocardia), Trachycardium (Regozara), Trachycardium (Trachycardium), Trachycardium cotteri, Trachycardium egmontianum, Trachycardium enode, Trachycardium eufaulensis, Trachycardium eversum, Trachycardium halaense, Trachycardium kinsmarae, Trachycardium lacunosum, Trachycardium mollyni, Trachycardium multiradiatum, Trachycardium planicostata, Trachycardium puelchum, Trachycardium reynoldsi, Trachycardium rugosum, Trachycardium syriacum, Trachycardium thalassium, Cardium (Granocardium) sabulosum
Subtaxa: Mexicardia procera Trachycardium (Mexicardia) dominicanum
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Quaternary of Chile (8 collections), Costa Rica (1), Ecuador (2), Mexico (8), Panama (1), Peru (7), United States (21: California)
• Pliocene of Chile (3), Costa Rica (3), Ecuador (1), Peru (1)
• Miocene of Colombia (1), the Dominican Republic (18), Panama (20), Peru (1), Venezuela (1)
• Eocene to Oligocene of Haiti (1)
Total: 98 collections each including a single occurrence