1. Subgenus Isocardia (Miocardiella) Sacco, 1904 † (uncertain > unassessed)
   1. Species Isocardia (Miocardiella) taurinensis Sacco, 1904 † (uncertain > unassessed)
2. Species Isocardia acutangula Bellardi, 1852 † (uncertain > unassessed)
3. Species Isocardia aegyptiaca L. R. Cox, 1955 † (uncertain > unassessed)
4. Species Isocardia antiqua G. A. Goldfuss, 1837 † (uncertain > unassessed)
5. Species Isocardia ataxensis A. d'Orbigny, 1844 † (uncertain > unassessed)
6. Species Isocardia beaugrandi de Loriol, 1874 † (uncertain > unassessed)
7. Species Isocardia bicarinata F. A. Roemer, 1843 † (uncertain > unassessed)
8. Species Isocardia branneri C. A. White, 1887 † (uncertain > unassessed)
9. Species Isocardia brevis C. M. d'Orbigny, 1822 † (uncertain > unassessed)
10. Species Isocardia bulbosa Stephenson, 1941 † (uncertain > unassessed)
11. Species Isocardia carantonensis A. d'Orbigny, 1844 † (uncertain > unassessed)
12. Species Isocardia carolina Dall, 1900 † (uncertain > unassessed)
13. Species Isocardia chicoensis Waring, 1917 † (uncertain > unassessed)
14. Species Isocardia cingulata G. A. Goldfuss, 1837 † (uncertain > unassessed)
15. Species Isocardia concentrica J. De C. Sowerby, 1825 † (uncertain > unassessed)
16. Species Isocardia contorta Barrande, 1881 † (uncertain > unassessed)
17. Species Isocardia cornuta Klöden, 1834 † (uncertain > unassessed)
18. Species Isocardia cottaldina de Loriol, 1868 † (uncertain > unassessed)
19. Species Isocardia coutinhoana C. A. White, 1887 † (uncertain > unassessed)
20. Species Isocardia cretacea G. A. Goldfuss, 1837 † (uncertain > unassessed)
21. Species Isocardia cryptoceras A. d'Orbigny, 1844 † (uncertain > unassessed)
22. Species Isocardia cyrenoides O. Boettger, 1880 † (uncertain > unassessed)
23. Species Isocardia deperdita de Koninck, 1844 † (uncertain > unassessed)
24. Species Isocardia deshayesii Michelotti, 1847 † (uncertain > unassessed)
25. Species Isocardia dicerata C. M. d'Orbigny, 1822 † (uncertain > unassessed)
26. Species Isocardia dorsata F. A. Roemer, 1836 † (uncertain > unassessed)
27. Species Isocardia ebergensis Weerth, 1884 † (uncertain > unassessed)
28. Species Isocardia elongata Zieten, 1833 † (uncertain > unassessed)
29. Species Isocardia exaltata Pusch, 1836 † (uncertain > unassessed)
30. Species Isocardia extensa Münster, 1840 † (uncertain > unassessed)
31. Species Isocardia fraterna Say, 1824 † (uncertain > unassessed)
32. Species Isocardia grandicornis Schafhäutl, 1851 † (uncertain > unassessed)
33. Species Isocardia hendersoni Stephenson, 1941 † (uncertain > unassessed)
34. Species Isocardia inversa G. A. Goldfuss, 1837 † (uncertain > unassessed)
35. Species Isocardia irelandi Stephenson, 1941 † (uncertain > unassessed)
36. Species Isocardia justinensis Mayer-Eymar, 1893 † (uncertain > nomen dubium)
37. Species Isocardia karabakhensis Bobkova, 1949 † (uncertain > unassessed)
38. Species Isocardia letteroni de Loriol, 1868 † (uncertain > unassessed)
39. Species Isocardia lineata Münster, 1837 † (uncertain > unassessed)
40. Species Isocardia lineolata Gemmellaro, 1875 † (uncertain > unassessed)
41. Species Isocardia longirostris F. A. Roemer, 1841 † (uncertain > unassessed)
42. Species Isocardia lunulata F. A. Roemer, 1841 † (uncertain > unassessed, junior homonym of Isocardia lunulata Nyst, 1835)
43. Species Isocardia markoei Conrad, 1842 † (uncertain > unassessed)
44. Species Isocardia mazlea Glenn, 1904 † (uncertain > unassessed)
45. Species Isocardia mediavia G. D. Harris, 1896 † (uncertain > unassessed)
46. Species Isocardia merrilli Hamlin, 1884 † (uncertain > unassessed)
47. Species Isocardia minima J. Sowerby, 1821 † (uncertain > unassessed)
48. Species Isocardia novensis Stephenson, 1936 † (uncertain > unassessed)
49. Species Isocardia nucleus F. A. Roemer, 1839 † (uncertain > unassessed)
50. Species Isocardia obovata F. A. Roemer, 1836 † (uncertain > unassessed)
51. Species Isocardia orbicularis F. A. Roemer, 1836 † (uncertain > unassessed)
52. Species Isocardia ornata Forbes, 1845 † (uncertain > unassessed)
53. Species Isocardia orthocera C. M. d'Orbigny, 1822 † (uncertain > unassessed)
54. Species Isocardia parvula F. A. Roemer, 1836 † (uncertain > unassessed)
55. Species Isocardia praecisa C. A. White, 1887 † (uncertain > unassessed)
56. Species Isocardia pumila de Koninck, 1842 † (uncertain > unassessed)
57. Species Isocardia pyrenaica A. d'Orbigny, 1844 † (uncertain > unassessed)
58. Species Isocardia rostrata J. Sowerby, 1821 † (uncertain > unassessed)
59. Species Isocardia rostrata Münster, 1841 † (uncertain > unassessed, junior homonym of I. rostrata J. Sowerby, 1821)
60. Species Isocardia shumardi Stephenson, 1941 † (uncertain > unassessed)
61. Species Isocardia studeri de Loriol, 1861 † (uncertain > unassessed)
62. Species Isocardia subangulata G. Müller, 1900 † (uncertain > unassessed)
63. Species Isocardia subsinuata Forbes, 1846 † (uncertain > unassessed)
64. Species Isocardia subtenera G. Müller, 1900 † (uncertain > unassessed)
65. Species Isocardia sulcata J. Sowerby, 1821 † (uncertain > unassessed)
66. Species Isocardia supermensa C. A. White, 1887 † (uncertain > unassessed)
67. Species Isocardia tener J. Sowerby, 1821 † (uncertain > unassessed)
68. Species Isocardia texata Münster, 1837 † (uncertain > unassessed)
69. Species Isocardia transversa Münster, 1837 † (uncertain > unassessed)
70. Species Isocardia transversa C. M. d'Orbigny, 1826 † (uncertain > unassessed)
71. Species Isocardia trapezoidalis F. A. Roemer, 1850 † (uncertain > unassessed)
72. Species Isocardia trigona F. A. Roemer, 1841 † (uncertain > unassessed)
73. Species Isocardia truncata G. A. Goldfuss, 1837 † (uncertain > unassessed)
74. Species Isocardia vetusta G. A. Goldfuss, 1841 † (uncertain > unassessed)
75. Species Isocardia vorax † (uncertain > unassessed)
76. Species Isocardia washita Marcou, 1858 † (uncertain > unassessed)
77. Species Isocardia zitteli G. Boehm, 1883 † (uncertain > unassessed)
78. Subgenus Isocardia (Aralocardia) Vialov, 1937 † accepted as Glossus (Aralocardia) Vialov, 1937 † represented as Glossus Poli, 1795
    1. Species Isocardia (Aralocardia) abichiana Romanovsky, 1890 † accepted as Glossus abichianus (Romanovsky, 1890) † (unaccepted > superseded combination)
    2. Species Isocardia (Aralocardia) eichwaldiana Romanovsky, 1890 † accepted as Glossus eichwaldianus (Romanovsky, 1890) † (unaccepted > superseded combination)
    3. Species Isocardia (Aralocardia) gigantaea Ovechkin, 1954 † accepted as Glossus gigantaeus (Ovechkin, 1954) † (unaccepted > superseded combination)
79. Subgenus Isocardia (Cytherocardia) Sacco, 1900 † accepted as Cytherocardia Sacco, 1900 † (unaccepted > superseded rank)
80. Subgenus Isocardia (Isocardia) Lamarck, 1799 † accepted as Glossus Poli, 1795 (unaccepted > junior subjective synonym)
    1. Species Isocardia (Isocardia) cor (Linnaeus, 1758) accepted as Glossus humanus (Linnaeus, 1758) (unaccepted > junior subjective synonym)
81. 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) †
82. Subgenus Isocardia (Miocardia) P. Fischer, 1887 accepted as Meiocardia H. Adams & A. Adams, 1857 (unaccepted > superseded rank)
    1. Species Isocardia (Miocardia) deshayesi Michelotti, 1847 † (uncertain > unassessed)
    2. Species Isocardia (Miocardia) deshayesii Michelotti, 1847 † (uncertain > unassessed)
    3. Species Isocardia (Miocardia) moltkianoides Michelotti, 1847 † (uncertain > unassessed)
    4. Species Isocardia (Miocardia) perplexa Sacco, 1900 † (uncertain > unassessed)
83. Subgenus Isocardia (Sulcocardia) Rovereto, 1898 † accepted as Sulcocardia Rovereto, 1898 † (unaccepted > superseded rank)
84. Species Isocardia abichiana Romanovsky, 1890 † accepted as Glossus abichianus (Romanovsky, 1890) † (unaccepted > superseded combination)
85. Species Isocardia astartiformis Münster, 1841 † accepted as Schafhaeutlia astartiformis (Münster, 1841) † (unaccepted > superseded combination)
86. Species Isocardia basochiana Defrance, 1822 † accepted as Ceratomyopsis basochiana (Defrance, 1822) † (unaccepted > superseded combination)
87. Species Isocardia bohemica Barrande, 1881 † accepted as Jahnia bohemica (Barrande, 1881) † (unaccepted > superseded combination)
88. Species Isocardia buchii Klipstein, 1845 † accepted as Neomegalodon buchii (Klipstein, 1845) † (unaccepted > superseded combination)
89. Species Isocardia carinthiaca Boué, 1835 † accepted as Physocardia carinthiaca (Boué, 1835) † (unaccepted > superseded combination)
90. Species Isocardia chargehensis Mayer-Eymar, 1897 † accepted as Glossus chargehensis (Mayer-Eymar, 1897) † (unaccepted > superseded combination)
91. Species Isocardia conradi Gabb, 1860 † accepted as Glossus conradi (Gabb, 1860) † (unaccepted > superseded combination)
92. Species Isocardia cor (Linnaeus, 1767) accepted as Glossus humanus (Linnaeus, 1758) (unaccepted > junior subjective synonym)
93. Species Isocardia cordata Buckman, 1845 † accepted as Pseudisocardia cordata (Buckman, 1845) † (unaccepted > superseded combination)
94. Species Isocardia cordiformis Zieten, 1833 † accepted as Isoarca cordiformis (Zieten, 1833) † (unaccepted > superseded combination)
95. Species Isocardia crassa Nyst & Westendorp, 1839 † accepted as Glossus lunulatus crassus (Nyst & Westendorp, 1839) † (original combination)
96. Species Isocardia cyprinoides Sandberger, 1861 † accepted as Pygocardia cyprinoides (Sandberger, 1861) † (unaccepted > superseded combination)
97. Species Isocardia cytheroides Mayer[-Eymar], 1868 † accepted as Cytherocardia cytheroides (Mayer[-Eymar], 1868) † (unaccepted > superseded combination)
98. Species Isocardia delta Popenoe, 1937 † accepted as Ambocardia delta (Popenoe, 1937) † (unaccepted > superseded combination)
99. Species Isocardia eichwaldiana Romanovsky, 1890 † accepted as Glossus eichwaldianus (Romanovsky, 1890) † (unaccepted > superseded combination)
100. Species Isocardia eocaenica de Raincourt, 1876 † accepted as Cytherocardia eocaenica (de Raincourt, 1876) † (unaccepted > superseded combination)
101. Species Isocardia excentrica F. A. Roemer, 1836 † accepted as Ceratomya excentrica (F. A. Roemer, 1836) † (unaccepted > superseded combination)
102. Species Isocardia faxensis Lundgren, 1867 † accepted as Meiocardia faxensis (Lundgren, 1867) † (unaccepted > superseded combination)
103. Species Isocardia floridana Dall, 1900 † accepted as Meiocardia floridana (Dall, 1900) † (unaccepted > superseded combination)
104. Species Isocardia globosa Lamarck, 1801 accepted as Glossus humanus (Linnaeus, 1758)
105. Species Isocardia harpa G. A. Goldfuss, 1841 † accepted as Meiocardia harpa (G. A. Goldfuss, 1841) † (unaccepted > superseded combination)
106. Species Isocardia hibernica Reeve, 1845 accepted as Glossus humanus (Linnaeus, 1758)
107. Species Isocardia hodgei F. B. Meek, 1871 † accepted as Procardia hodgei (F. B. Meek, 1871) † (original combination)
108. Species Isocardia ignolea Glenn, 1904 † accepted as Glossus ignolea (Glenn, 1904) † (unaccepted > superseded combination)
109. Species Isocardia kumsuatense Ilyina, 1960 † accepted as Glossus subtransversus (A. d'Orbigny, 1852) † (unaccepted > junior subjective synonym)
110. Species Isocardia lamarckii Reeve, 1845 accepted as Meiocardia moltkiana (Gmelin, 1791) (unaccepted > junior subjective synonym)
111. Species Isocardia laticostata Münster, 1841 † accepted as Schafhaeutlia laticostata (Münster, 1841) † (unaccepted > superseded combination)
112. Species Isocardia linnaei Locard, 1886 accepted as Glossus humanus (Linnaeus, 1758)
113. Species Isocardia lunulata Nyst, 1835 † accepted as Glossus lunulatus (Nyst, 1835) † (unaccepted > superseded combination)
114. Species Isocardia minuta Klipstein, 1845 † accepted as Neomegalodon minutus (Klipstein, 1845) † (unaccepted > superseded combination)
115. Species Isocardia moltkiana (Gmelin, 1791) accepted as Meiocardia moltkiana (Gmelin, 1791) (unaccepted > superseded combination)
116. Species Isocardia moltkianoides Michelotti, 1847 † accepted as Miocardia moltkianoides (Michelotti, 1847) † (unaccepted > superseded combination)
117. Species Isocardia oblonga J. De C. Sowerby, 1825 † accepted as Cardiomorpha oblonga (J. De C. Sowerby, 1825) †
118. Species Isocardia olearii O. Semper, 1861 † accepted as Glossus olearii (O. Semper, 1861) † (unaccepted > superseded combination)
119. Species Isocardia ovata Münster, 1837 † accepted as Schafhaeutlia ovata (Münster, 1837) † (unaccepted > superseded combination)
120. Species Isocardia ovata de Koninck, 1842 † accepted as Isocardia deperdita de Koninck, 1844 † (unaccepted > junior homonym, junior homonym of Isocardia ovata Münster, 1837; Isocardia deperdita is a replacement name)
121. Species Isocardia plana Münster, 1841 † accepted as Schafhaeutlia plana (Münster, 1841) † (unaccepted > superseded combination)
122. Species Isocardia planidorsata Zittel, 1865 † accepted as Ambocardia planidorsata (Zittel, 1865) † (unaccepted > superseded combination)
123. Species Isocardia rimosa Münster, 1837 † accepted as Neomegalodon rimosus (Münster, 1837) † (unaccepted > superseded combination)
124. Species Isocardia semisulcata Lamarck, 1819 accepted as Cardilia semisulcata (Lamarck, 1819)
125. Species Isocardia similis J. De C. Sowerby, 1826 † accepted as Tortarctica similis (J. De C. Sowerby, 1826) † (unaccepted > superseded combination)
126. Species Isocardia striata C. M. d'Orbigny, 1822 † accepted as Ceratomyopsis striata (C. M. d'Orbigny, 1822) † (unaccepted > superseded combination)
127. Species Isocardia striata Fucini, 1913 † accepted as Cornucardia hornigii (Bittner, 1901) † (unaccepted > junior subjective synonym, also, junior homonym of Isocardia striata C. M. d'Orbigny, 1822)
128. Species Isocardia subspirata Münster, 1837 † accepted as Isoarca subspirata (Münster, 1837) † (unaccepted > superseded combination)
129. Species Isocardia subtransversa A. d'Orbigny, 1852 † accepted as Glossus subtransversus (A. d'Orbigny, 1852) † (unaccepted > superseded combination)
130. Species Isocardia tejonensis Waring, 1914 † accepted as Callocardia (Nitidavenus) tejonensis (Waring, 1914) † represented as Callocardia tejonensis (Waring, 1914) † (unaccepted > superseded combination)
131. 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.)
132. Species Isocardia unioniformis J. Phillips, 1836 † accepted as Edmondia unioniformis (J. Phillips, 1836) † (unaccepted > superseded combination)
133. Species Isocardia vulgaris Reeve, 1845 accepted as Meiocardia vulgaris (Reeve, 1845) (original combination)
134. Species Isocardia zitteli Holzapfel, 1889 † accepted as Ambocardia planidorsata (Zittel, 1865) † (unaccepted > junior subjective synonym)

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