1. Subgenus Isocardia (Cytherocardia) Sacco, 1900 † accepted as Cytherocardia Sacco, 1900 † (unaccepted > superseded rank)
2. Subgenus Isocardia (Meiocardia) H. Adams & A. Adams, 1857 † accepted as Meiocardia H. Adams & A. Adams, 1857
   1. Species Isocardia (Meiocardia) subcumingii H. Woodward, 1879 † accepted as Meiocardia subcumingii (H. Woodward, 1879) †
3. Subgenus Isocardia (Sulcocardia) Rovereto, 1898 † accepted as Sulcocardia Rovereto, 1898 † (unaccepted > superseded rank)
4. Species Isocardia astartiformis Münster, 1841 † accepted as Schafhaeutlia astartiformis (Münster, 1841) † (unaccepted > superseded combination)
5. Species Isocardia buchii Klipstein, 1845 † accepted as Neomegalodon buchii (Klipstein, 1845) † (unaccepted > superseded combination)
6. Species Isocardia carinthiaca Boué, 1835 † accepted as Physocardia carinthiaca (Boué, 1835) † (unaccepted > superseded combination)
7. Species Isocardia cor (Linnaeus, 1767) accepted as Glossus humanus (Linnaeus, 1758)
8. Species Isocardia cordiformis Zieten, 1833 † accepted as Isoarca cordiformis (Zieten, 1833) † (unaccepted > superseded combination)
9. Species Isocardia crassa Nyst & Westendorp, 1839 † accepted as Glossus lunulatus crassus (Nyst & Westendorp, 1839) † (original combination)
10. Species Isocardia cyprinoides Sandberger, 1861 † accepted as Pygocardia cyprinoides (Sandberger, 1861) † (unaccepted > superseded combination)
11. Species Isocardia cytheroides Mayer, 1868 † accepted as Cytherocardia cytheroides (Mayer, 1868) † (unaccepted > superseded combination)
12. Species Isocardia eocaenica de Raincourt, 1876 † accepted as Cytherocardia eocaenica (de Raincourt, 1876) † (unaccepted > superseded combination)
13. Species Isocardia excentrica F. A. Roemer, 1836 † accepted as Ceratomya excentrica (F. A. Roemer, 1836) † (unaccepted > superseded combination)
14. Species Isocardia floridana Dall, 1900 † accepted as Meiocardia floridana (Dall, 1900) † (unaccepted > superseded combination)
15. Species Isocardia globosa Lamarck, 1801 accepted as Glossus humanus (Linnaeus, 1758)
16. Species Isocardia hibernica Reeve, 1845 accepted as Glossus humanus (Linnaeus, 1758)
17. Species Isocardia hodgei Meek, 1871 † accepted as Procardia hodgei (Meek, 1871) † (original combination)
18. Species Isocardia kumsuatense Ilyina, 1960 † accepted as Glossus subtransversus (A. d'Orbigny, 1852) † (unaccepted > junior subjective synonym)
19. Species Isocardia lamarckii Reeve, 1845 accepted as Meiocardia moltkiana (Gmelin, 1791) (unaccepted > junior subjective synonym)
20. Species Isocardia laticostata Münster, 1841 † accepted as Schafhaeutlia laticostata (Münster, 1841) † (unaccepted > superseded combination)
21. Species Isocardia linnaei Locard, 1886 accepted as Glossus humanus (Linnaeus, 1758)
22. Species Isocardia lunulata Nyst, 1835 † accepted as Glossus lunulatus (Nyst, 1835) † (original combination)
23. Species Isocardia minuta Klipstein, 1845 † accepted as Neomegalodon minutus (Klipstein, 1845) † (unaccepted > superseded combination)
24. Species Isocardia moltkiana (Gmelin, 1791) accepted as Meiocardia moltkiana (Gmelin, 1791) (unaccepted > superseded combination)
25. Species Isocardia oblonga J. De C. Sowerby, 1825 † accepted as Cardiomorpha oblonga (J. De C. Sowerby, 1825) †
26. Species Isocardia olearii O. Semper, 1861 † accepted as Glossus olearii (O. Semper, 1861) † (unaccepted > superseded combination)
27. Species Isocardia rimosa Münster, 1837 † accepted as Neomegalodon rimosus (Münster, 1837) † (unaccepted > superseded combination)
28. Species Isocardia semisulcata Lamarck, 1819 accepted as Cardilia semisulcata (Lamarck, 1819)
29. Species Isocardia similis J. De C. Sowerby, 1826 † accepted as Tortarctica similis (J. De C. Sowerby, 1826) † (unaccepted > superseded combination)
30. Species Isocardia striata Fucini, 1913 † accepted as Cornucardia hornigii (Bittner, 1901) † (unaccepted > junior subjective synonym)
31. Species Isocardia striata C. M. d'Orbigny, 1822 † accepted as Ceratomyopsis striata (C. M. d'Orbigny, 1822) † (unaccepted > superseded combination)
32. Species Isocardia subspirata Münster, 1837 † accepted as Isoarca subspirata (Münster, 1837) † (unaccepted > superseded combination)
33. Species Isocardia subtransversa A. d'Orbigny, 1852 † accepted as Glossus subtransversus (A. d'Orbigny, 1852) † (unaccepted > superseded combination)
34. Species Isocardia tetragona A. Adams & Reeve, 1850 accepted as Meiocardia samarangiae F. R. Bernard, Y. Cai & B. Morton, 1993 (Invalid: junior homonym of Isocardia tetragona Koch & Dunker, 1837; Meiocardia samarangiae Bernard, Cai & Morton, 1993 is a replacement name.)
35. Species Isocardia unioniformis J. Phillips, 1836 † accepted as Edmondia unioniformis (J. Phillips, 1836) † (unaccepted > superseded combination)
36. Species Isocardia vulgaris Reeve, 1845 accepted as Meiocardia vulgaris (Reeve, 1845) (original combination)
37. Subgenus Isocardia (Miocardiella) Sacco, 1904 † (uncertain > unassessed)
    1. Species Isocardia (Miocardiella) taurinensis Sacco, 1904 † (uncertain > unassessed)
38. Species Isocardia aegyptiaca L. R. Cox, 1955 † (uncertain > unassessed)
39. Species Isocardia antiqua Goldfuss, 1837 † (uncertain > unassessed)
40. Species Isocardia ataxensis A. d'Orbigny, 1844 † (uncertain > unassessed)
41. Species Isocardia brevis C. M. d'Orbigny, 1822 † (uncertain > unassessed)
42. Species Isocardia carantonensis A. d'Orbigny, 1844 † (uncertain > unassessed)
43. Species Isocardia cingulata Goldfuss, 1837 † (uncertain > unassessed)
44. Species Isocardia concentrica J. De C. Sowerby, 1825 † (uncertain > unassessed)
45. Species Isocardia cornuta Klöden, 1834 † (uncertain > unassessed)
46. Species Isocardia cretacea Goldfuss, 1837 † (uncertain > unassessed)
47. Species Isocardia cryptoceras A. d'Orbigny, 1844 † (uncertain > unassessed)
48. Species Isocardia cyrenoides O. Boettger, 1880 † (uncertain > unassessed)
49. Species Isocardia dicerata C. M. d'Orbigny, 1822 † (uncertain > unassessed)
50. Species Isocardia elongata Zieten, 1833 † (uncertain > unassessed)
51. Species Isocardia exaltata Pusch, 1836 † (uncertain > unassessed)
52. Species Isocardia grandicornis Schafhäutl, 1851 † (uncertain > unassessed)
53. Species Isocardia harpa Goldfuss, 1841 † (uncertain > unassessed)
54. Species Isocardia inversa Goldfuss, 1837 † (uncertain > unassessed)
55. Species Isocardia justinensis Mayer-Eymar, 1893 † (uncertain > nomen dubium)
56. Species Isocardia karabakhensis Bobkova, 1949 † (uncertain > unassessed)
57. Species Isocardia lineata Münster, 1837 † (uncertain > unassessed)
58. Species Isocardia lineolata Gemmellaro, 1875 † (uncertain > unassessed)
59. Species Isocardia markoei Conrad, 1842 † (uncertain > unassessed)
60. Species Isocardia merrilli Hamlin, 1884 † (uncertain > unassessed)
61. Species Isocardia minima J. Sowerby, 1821 † (uncertain > unassessed)
62. Species Isocardia orthocera C. M. d'Orbigny, 1822 † (uncertain > unassessed)
63. Species Isocardia ovata Münster, 1837 † (uncertain > unassessed)
64. Species Isocardia plana Münster, 1841 † (uncertain > unassessed)
65. Species Isocardia pyrenaica A. d'Orbigny, 1844 † (uncertain > unassessed)
66. Species Isocardia rostrata J. Sowerby, 1821 † (uncertain > unassessed)
67. Species Isocardia rostrata Münster, 1841 † (uncertain > unassessed, junior homonym of I. rostrata J. Sowerby, 1821)
68. Species Isocardia sulcata J. Sowerby, 1821 † (uncertain > unassessed)
69. Species Isocardia tener J. Sowerby, 1821 † (uncertain > unassessed)
70. Species Isocardia texata Münster, 1837 † (uncertain > unassessed)
71. Species Isocardia transversa Münster, 1837 † (uncertain > unassessed)
72. Species Isocardia transversa C. M. d'Orbigny, 1826 † (uncertain > unassessed)
73. Species Isocardia truncata Goldfuss, 1837 † (uncertain > unassessed)
74. Species Isocardia vetusta Goldfuss, 1841 † (uncertain > unassessed)
75. Species Isocardia zitteli G. Boehm, 1883 † (uncertain > unassessed)

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