Classification of the genus Nemocardium
G. Nemocardium Meek 1876
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†Cardium (Nemocardium) bhagothorense Vredenburg 1928
†Cardium (Nemocardium) brasiliense White 1887
Subg. Nemocardium (Keenaea) Habe 1951
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Nemocardium (Keenaea) centifilosum Carpenter 1864
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Invalid names: Cardium richardsoni Whiteaves 1878 [synonym]
Subg. Nemocardium (Lophocardium) Fischer 1887
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Lophocardium cumingii Broderip 1834
†Nemocardium (Lophocardium) gurabicum Maury 1917
Subg. Nemocardium (Lyrocardium) Meek 1876
Subg. Nemocardium (Nemocardium) Meek 1876
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†Nemocardium (Nemocardium) diversum Conrad 1848
†Nemocardium (Nemocardium) eocenense Meyer 1887
†Nemocardium (Nemocardium) linteum Conrad 1855
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Invalid names: Cardium (Protocardium) marysvillensis Dickerson 1916 [synonym], Cardium cooperi Gabb 1864 [synonym], Cardium dalli Dickerson 1913 [synonym]
†Nemocardium (Nemocardium) lorenzanum Arnold 1908
†Nemocardium (Nemocardium) yokoyamai Takeda 1953
†Nemocardium diversum waynense Mansfield 1940
Subg. Nemocardium (Pratulum) Iredale 1924
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†Pratulum antisemigranulatum McCoy 1877
†Pratulum hemimeris Tate 1887
†Pratulum scrobiculatum Stoliczka 1870
Pratulum thetidis Hedley 1902
†Pratulum victoriae Tate 1887
Subg. †Nemocardium (Varicardium) Marwick 1944
Nemocardium bechei Reeve 1847
†Nemocardium cooperii Gabb 1864
†Nemocardium eugenense Clark 1925
†Nemocardium ezoense Takeda 1953
†Nemocardium granosulcatum Traub 1938
†Nemocardium hadraterum Woodring 1982
†Nemocardium lincolnensis Weaver 1916
†Nemocardium nicolletti Conrad 1854
†Nemocardium nitens Sowerby 1813
†Nemocardium parile Deshayes 1858
†Nemocardium patulum Hutton 1873
†Nemocardium plumsteadianum Sowerby 1813
†Nemocardium semiasperum Deshayes 1858
†Nemocardium semitectum Marwick 1926
†Nemocardium turgidum Solander 1766