• Cardium Barrande, 1881 † (uncertain) [Family: Bivalvia (awaiting allocation)]
• Cardium Linnaeus, 1758 [Family: Cardiidae]
• Cardium acardo Deshayes
• Cardium aculcatum Aradas & Benoit, 1870 accepted as Acanthocardia aculeata (Linnaeus, 1758)
• Cardium aculeata Linnaeus, 1758 accepted as Acanthocardia aculeata (Linnaeus, 1758)
• Cardium aculeatum Linnaeus, 1758
• Cardium adamsii Adams & Reeve, 1850 accepted as Nemocardium samarangae (Makiyama, 1934)
• Cardium aeolicum Born, 1778 accepted as Lyrocardium aeolicum (Born, 1778)
• Cardium aeolicum Gmelin, 1791 accepted as Lyrocardium aeolicum (Born, 1778)
• Cardium aequale Deshayes, 1855 accepted as Corculum cardissa (Linnaeus, 1758)
• Cardium agheilensis Kaltenbach, 1949 accepted as Cerastoderma glaucum (Bruguière, 1789)
• Cardium alabastrum Carpenter, 1857 accepted as Trigoniocardia granifera (Broderip & G.B. Sowerby I, 1829)
• Cardium alternatum G.B. Sowerby II, 1840
• Cardium amboinense Gmelin, 1791 accepted as Glycymeris amboinensis (Gmelin, 1791)
• Cardium andreae Dujardin, 1837
• Cardium angulatum Lamark, 1819 accepted as Vasticardium angulatum (Lamarck, 1819)
• Cardium annae Pilsbry, 1904 accepted as Fulvia mutica (Reeve, 1844)
• Cardium annettae Dall, 1889 accepted as Lophocardium annettae (Dall, 1889)
• Cardium antillarum d'Orbigny, 1853 accepted as Trigoniocardia antillarum (d'Orbigny, 1853)
• Cardium apertum (Muenster in Goldfuss, 1837)
• Cardium apertum Bruguière, 1789 accepted as Fulvia aperta (Bruguière, 1789)
• Cardium apicinum (Carpenter, 1864) accepted as Laevicardium substriatum (Conrad, 1837)
• Cardium arabicus Issel, 1869 accepted as Afrocardium richardi (Audouin, 1826)
• Cardium arcaeformis Chapman, W.D. & Crespin, I. †
• Cardium arcticum Sowerby, 1841 accepted as Ciliatocardium ciliatum (Fabricius, 1780)
• Cardium arcuatulum G.B. Sowerby III, 1874 accepted as Fragum mundum (Reeve, 1845)
• Cardium arenicolum Reeve, 1845 accepted as Acrosterigma maculosum (W. Wood, 1815)
• Cardium artum Linnaeus, 1758
• Cardium asarda (Deshayes)
• Cardium asiaticum Bruguière, 1789
• Cardium aspersum G.B. Sowerby I, 1833 accepted as Papyridea aspersa (G.B. Sowerby I, 1833)
• Cardium asperulum Lamarck, 1805
• Cardium assimile (Reeve, 1844)
• Cardium attenuatum G.B. Sowerby II, 1841 accepted as Laevicardium attenuatum (G.B. Sowerby II, 1841)
• Cardium aurantiacum A. Adams & Reeve, 1850 accepted as Lyrocardium aurantiacum (A. Adams & Reeve, 1850)
• Cardium auricula Niebuhr in Forsskål, 1775
• Cardium austaliense Reeve, 1844
• Cardium australe Sowerby, 1840
• Cardium aviculare (Lamarck, 1805)
• Cardium baeri Grimm, 1877 accepted as Didacna baeri (Grimm, 1877)
• Cardium barbotdemarnii Grimm, 1877 accepted as Didacna barbotdemarnii (Grimm, 1877)
• Cardium beauforti Prashad, 1932 accepted as Acrosterigma impolitum (G.B. Sowerby II, 1841)
• Cardium bechei Reeve, 1847 accepted as Nemocardium bechei (Reeve, 1847)
• Cardium belcheri Broderip & G.B. Sowerby I, 1829 accepted as Trachycardium belcheri (Broderip & G.B. Sowerby I, 1829)
• Cardium belgicum De Malzine, 1867 accepted as Cerastoderma edule (Linnaeus, 1758)
• Cardium belticum Reeve, 1845 accepted as Cerastoderma glaucum (Bruguière, 1789)
• Cardium bengasiensis Kaltenbach, 1943 accepted as Cerastoderma glaucum (Bruguière, 1789)
• Cardium biangulatum Broderip & G.B. Sowerby I, 1829 accepted as Americardia biangulata (Broderip & G.B. Sowerby I, 1829)
• Cardium biradiatum Bruguière, 1789 accepted as Laevicardium biradiatum (Bruguière, 1789)
• Cardium blandum Gould, 1850 accepted as Keenocardium blandum (Gould, 1850)
• Cardium boreale Broderip & G.B. Sowerby I, 1829 accepted as Keenocardium californiense (Deshayes, 1839)
• Cardium boreale Reeve, 1845 accepted as Serripes groenlandicus (Mohr, 1786)
• Cardium brasilianum Lamarck, 1819 accepted as Laevicardium brasilianum (Lamarck, 1819)
• Cardium bredai Mueller
• Cardium brongniarti d'Archiac
• Cardium bullatum (Linnaeus, 1758) accepted as Fulvia aperta (Bruguière, 1789)
• Cardium bullatum Lamarck, 1819 accepted as Papyridea lata (Born, 1778)
• Cardium bullatum Locard, 1892 accepted as Acanthocardia echinata (Linnaeus, 1758) accepted as Cardium echinatum Linnaeus, 1758
• Cardium bülowi Rolle, 1896 accepted as Keenocardium buelowi (Rolle, 1896)
• Cardium burchardti Dunker, 1877 accepted as Acrosterigma burchardi (Dunker, 1877)
• Cardium burdigalinum Lamarck
• Cardium burnupi (G.B. Sowerby III, 1897)
• Cardium californianum Conrad, 1837 accepted as Clinocardium nuttallii (Conrad, 1837)
• Cardium californiense Deshayes, 1839 accepted as Keenocardium californiense (Deshayes, 1839)
• Cardium campechiense Röding, 1798 accepted as Dallocardia muricata (Linnaeus, 1758)
• Cardium cancellatum Nomura, 1933 accepted as Trifaricardium nomurai Kuroda & Habe, 1951
• Cardium caparti Nicklès, 1955 accepted as Europicardium caparti (Nicklès, 1955)
• Cardium cardissa Linnæus, 1758 accepted as Corculum cardissa (Linnaeus, 1758)
• Cardium carditaeforme Reeve, 1845 accepted as Afrocardium richardi (Audouin, 1826)
• Cardium carnuntinum Partsch
• Cardium centumliratum Melvill in Melvill & Standen, 1907 accepted as Frigidocardium centumliratum (Mellvill in Melvill & Standen, 1907)
• Cardium ceramidum Dall, 1886 accepted as Trigoniocardia antillarum (d'Orbigny, 1853)
• Cardium ciliare Linnaeus, 1758
• Cardium ciliatum Fabricius, 1780 accepted as Ciliatocardium ciliatum (Fabricius, 1780)
• Cardium cingulatum Goldfuss
• Cardium citrinum Brusina, 1865 accepted as Laevicardium serratum (Linnaeus, 1758)
• Cardium civica Yokoyama, 1927 accepted as Cardiolucina civica (Yokoyama, 1927)
• Cardium clarionense Hertlein & Strong, 1947 accepted as Laevicardium clarionense (Hertlein & Strong, 1947)
• Cardium clodiense Brocchi, 1814
• Cardium coefiensis Kaltenbach, 1943 accepted as Cerastoderma glaucum (Bruguière, 1789)
• Cardium comatulum Bronn
• Cardium concinnum Bush
• Cardium conjugens (Partsch in Hoernes, 1861)
• Cardium consors G.B. Sowerby I, 1833 accepted as Trachycardium consors (G.B. Sowerby I, 1833)
• Cardium corallinum Linnaeus, 1758 accepted as Mactra corallina (Linnaeus, 1758)
• Cardium corbis Martyn, 1784 accepted as Clinocardium nuttallii (Conrad, 1837)
• Cardium cornucopia
• Cardium coronatum Spengler, 1799
• Cardium costatum Linnaeus, 1758
• Cardium crassatellatum
• Cardium crassum Gmelin, 1791 accepted as Laevicardium crassum (Gmelin, 1791)
• Cardium crenelloides Melvill, 1909 accepted as Afrocardium richardi (Audouin, 1826)
• Cardium crenulatum Lamarck, 1819 accepted as Cerastoderma edule (Linnaeus, 1758)
• Cardium crockeri Strong & Hertlein, 1937 accepted as Papyridea crockeri (Strong & Hertlein, 1937)
• Cardium cruentum Perry, 1811 accepted as Fragum unedo (Linnaeus, 1758)
• Cardium cumingii Broderip, 1833 accepted as Lophocardium cumingii (Broderip, 1833)
• Cardium cygnorum Deshayes, 1855 accepted as Acrosterigma cygnorum (Deshayes, 1855)
• Cardium cymbulare Lamarck
• Cardium cyprium
• Cardium darwini Mayer, 1866 † accepted as Cardium indicum Lamarck, 1819