Classification of the genus Protocardium
G. †Protocardia Beyrich 1845
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†Cardium (Protocardia) arkansense Conrad 1855
†Cardium (Protocardia) pauli Coquand 1862
†Cardium (Protocardium) granuliferum Gabb 1869
Subg. †Protocardia (Leptocardia) Meek 1876
Subg. †Protocardia (Pachycardium) Conrad 1869
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†Pachycardium coronaensis Packard 1922
†Pachycardium remondianum Gabb 1864
Subg. †Protocardia (Protocardia) Beyrich 1845
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†Protocardia (Protocardia) alta Forbes 1846
†Protocardia (Protocardia) philippiana Dunker 1847
†Protocardia (Protocardia) striatulum Sowerby 1829
Subg. †Protocardia (Tamilicardia) Chiplonkar and Tapaswi 1976
†Protocardia alcesiana McLearn 1933
†Protocardia buckmani Morris and Lycett 1853
†Protocardia costaricensis Olsson 1922
†Protocardia dufrenoyca Buvignier 1852
†Protocardia eduliformis Roemer 1836
†Protocardia gambrina Gabb 1861
†Protocardia hillana Sowerby 1813
†Protocardia intexta Muenster 1837
†Protocardia lingulata Lycett 1863
†Protocardia luggudensis Troedsson 1951
†Protocardia newberryana Gabb 1881
†Protocardia peregrinorsa d'Orbigny 1842
†Protocardia pesolina Contejean 1859
†Protocardia philippiana Dunker 1847
†Protocardia piettei Fischer 1969
†Protocardia placerensis Gabb 1864
†Protocardia pulchella Chiplonkar and Tapaswi 1976
†Protocardia qinghaiensis Wen 1979
†Protocardia razavii Repin 2013
†Protocardia salrivalis Harris 1919
†Protocardia somaliensis Cox 1935
†Protocardia stantoni Wade 1926
†Protocardia stonei Cragin 1893
†Protocardia striatula Sowerby 1829
†Protocardia stricklandi Morris and Lycett 1853
†Protocardia subquadrata Evans and Shumard 1857
†Protocardia translucida Gabb 1869
†Protocardia truncata Sowerby 1827
†Protocardia umkwelanensis Etheridge 1904
†Protocardia virginiana Conrad 1864
Subg. †Protocardium (Brevicardium) Stephenson 1941