1. Species Perna acutirostris Dunker, 1869 accepted as Isognomon nucleus (Lamarck, 1819) (unaccepted > nomen nudum, nomen nudum)
2. Species Perna albisoror Iredale, 1939 accepted as Isognomon albisoror (Iredale, 1939)
3. Species Perna anomioides Reeve, 1858 accepted as Isognomon australicus (Reeve, 1858)
4. Species Perna aquila Clessin, 1890 accepted as Isognomon isognomum (Linnaeus, 1758)
5. Species Perna arbolensis H. Woods, 1922 † accepted as Amotapus arbolensis (H. Woods, 1922) † (unaccepted > superseded combination)
6. Species Perna argillacea A. Gould, 1850 accepted as Isognomon ephippium (Linnaeus, 1758)
7. Species Perna attenuata Reeve, 1858 accepted as Isognomon isognomum (Linnaeus, 1758)
8. Species Perna australica Reeve, 1858 accepted as Isognomon australicus (Reeve, 1858)
9. Species Perna avicularis Lamarck, 1819 accepted as Isognomon isognomum (Linnaeus, 1758)
10. Species Perna aviculina Deshayes, 1858 † accepted as Aviculoperna aviculina (Deshayes, 1858) † (unaccepted > superseded combination)
11. Species Perna aviculoides J. Sowerby, 1814 † accepted as Gervillia aviculoides (J. Sowerby, 1814) † (unaccepted > superseded combination, unassessed)
12. Species Perna bazini Deshayes, 1858 † accepted as Isognomon bazini (Deshayes, 1858) † (unaccepted > superseded combination)
13. Species Perna bicolor C. B. Adams, 1845 accepted as Isognomon bicolor (C. B. Adams, 1845) (original combination)
14. Species Perna californica Conrad, 1837 accepted as Isognomon californicus (Conrad, 1837) (original combination)
15. Species Perna canina Lamarck, 1819 accepted as Isognomon isognomum (Linnaeus, 1758)
16. Species Perna caudata Reeve, 1858 accepted as Isognomon legumen (Gmelin, 1791)
17. Species Perna chemnitziana A. d'Orbigny, 1853 accepted as Isognomon bicolor (C. B. Adams, 1845)
18. Species Perna chilensis T. A. Conrad, 1855 † accepted as Perna gaudichaudi A. d'Orbigny, 1843 † accepted as Isognomon gaudichaudi (A. d'Orbigny, 1843) † (unaccepted > junior subjective synonym)
19. Species Perna ciscaucasica Davitashvili, 1932 † accepted as Isognomon radiatus (M. Hörnes, 1867) † (unaccepted > junior subjective synonym)
20. Species Perna costellata Conrad, 1837 accepted as Isognomon perna (Linnaeus, 1767)
21. Species Perna cumingii Reeve, 1858 accepted as Isognomon ephippium (Linnaeus, 1758)
22. Species Perna dactylus Bory de Saint-Vincent, 1827 accepted as Isognomon legumen (Gmelin, 1791)
23. Species Perna dentifera Krauss, 1848 accepted as Isognomon nucleus (Lamarck, 1819) (junior synonym)
24. Species Perna dunkeri P. Fischer, 1881 accepted as Isognomon dunkeri (P. Fischer, 1881) (original combination)
25. Species Perna ephippium Reeve, 1858 accepted as Isognomon alatus (Gmelin, 1791)
26. Species Perna eremita A. Gould, 1850 accepted as Isognomon perna (Linnaeus, 1767)
27. Species Perna femoralis Lamarck, 1819 accepted as Isognomon isognomum (Linnaeus, 1758)
28. Species Perna fimbriata Reeve, 1858 accepted as Isognomon isognomum (Linnaeus, 1758)
29. Species Perna flava Clessin, 1890 accepted as Isognomon isognomum (Linnaeus, 1758)
30. Species Perna gaudichaudi A. d'Orbigny, 1843 † accepted as Isognomon gaudichaudi (A. d'Orbigny, 1843) † (unaccepted > superseded combination)
31. Species Perna hawaiiensis Pease, 1871 accepted as Isognomon californicum (Conrad, 1837) accepted as Isognomon californicus (Conrad, 1837)
32. Species Perna imbricata Reeve, 1858 accepted as Isognomon ephippium (Linnaeus, 1758)
33. Species Perna incavata Cossmann, 1905 † accepted as Isognomon incavatus (Cossmann, 1905) † (unaccepted > superseded combination)
34. Species Perna incisa Conrad, 1837 accepted as Isognomon incisus (Conrad, 1837) (original combination)
35. Species Perna isognomon (Linnaeus, 1758) accepted as Isognomon isognomum (Linnaeus, 1758) (misspelling)
36. Species Perna isogona Bosc, 1801 accepted as Isognomon isognomum (Linnaeus, 1758)
37. Species Perna lamarckeana A. d'Orbigny, 1853 accepted as Isognomon radiatus (Anton, 1838)
38. Species Perna lamarckiana Clessin, 1890 accepted as Isognomon ephippium (Linnaeus, 1758)
39. Species Perna lamarckii Deshayes, 1830 † accepted as Isognomon lamarckii (Deshayes, 1830) † (unaccepted > superseded combination)
40. Species Perna laticostata Reeve, 1858 accepted as Isognomon legumen (Gmelin, 1791)
41. Species Perna lentiginosa Reeve, 1858 accepted as Isognomon legumen (Gmelin, 1791)
42. Species Perna limoides Reeve, 1858 accepted as Isognomon perna (Linnaeus, 1767)
43. Species Perna linguaeformis Reeve, 1858 accepted as Isognomon legumen (Gmelin, 1791)
44. Species Perna linnaei Dunker, 1869 accepted as Isognomon perna (Linnaeus, 1767)
45. Species Perna listeri Hanley, 1843 accepted as Isognomon radiatus (Anton, 1838)
46. Species Perna lobata Reeve, 1858 accepted as Isognomon nucleus (Lamarck, 1819) (junior subjective synonym)
47. Species Perna lusitanica Sharpe, 1850 † accepted as Isognomon lusitanicus (Sharpe, 1850) †
48. Species Perna marsupium Lamarck, 1819 accepted as Isognomon perna (Linnaeus, 1767)
49. Species Perna maxillata Lamarck, 1801 † accepted as Isognomon maxillatus (Lamarck, 1801) † (unaccepted > superseded combination)
50. Species Perna nana A. Gould, 1850 accepted as Isognomon nucleus (Lamarck, 1819) (junior subjective synonym)
51. Species Perna novohollandiae Clessin, 1890 accepted as Isognomon isognomum (Linnaeus, 1758)
52. Species Perna nucleus Lamarck, 1819 accepted as Isognomon nucleus (Lamarck, 1819) (superseded combination)
53. Species Perna obliqua Lamarck, 1819 accepted as Isognomon alatus (Gmelin, 1791)
54. Species Perna patibulum Reeve, 1858 accepted as Isognomon isognomum (Linnaeus, 1758)
55. Species Perna pectinata Reeve, 1858 accepted as Isognomon nucleus (Lamarck, 1819) (junior subjective synonym)
56. Species Perna planorbis Dufo, 1840 accepted as Isognomon nucleus (Lamarck, 1819) (junior subjective synonym)
57. Species Perna planulata Clessin, 1890 accepted as Isognomon isognomum (Linnaeus, 1758)
58. Species Perna polita Sharpe, 1850 † accepted as Alaperna polita (Sharpe, 1850) †
59. Species Perna quadrangularis Reeve, 1858 accepted as Isognomon nucleus (Lamarck, 1819) (junior subjective synonym)
60. Species Perna quadrata Anton, 1837 accepted as Isognomon recognitus (Mabille, 1895) (invalid: junior homonym of Perna quadrata J. de C. Sowerby, 1825)
61. Species Perna radiata Anton, 1838 accepted as Isognomon radiatus (Anton, 1838)
62. Species Perna radiata M. Hörnes, 1867 † accepted as Isognomon radiatus (M. Hörnes, 1867) † (unaccepted > superseded combination)
63. Species Perna recognita Mabille, 1895 accepted as Isognomon recognitus (Mabille, 1895) (original combination)
64. Species Perna reeveana Clessin, 1890 accepted as Isognomon ephippium (Linnaeus, 1758)
65. Species Perna ricordeana A. d'Orbigny, 1846 † accepted as Isognomon ricordeanus (A. d'Orbigny, 1846) † (unaccepted > superseded combination)
66. Species Perna rollei Clessin, 1890 accepted as Isognomon isognomum (Linnaeus, 1758)
67. Species Perna rollei M. Hörnes, 1867 † accepted as Isognomon rollei (M. Hörnes, 1867) † (unaccepted > superseded combination)
68. Species Perna rudis Reeve, 1858 accepted as Isognomon isognomum (Linnaeus, 1758)
69. Species Perna rugosa Münster, 1835 † accepted as Isognomon rugosus (Münster, 1835) †
70. Species Perna rupella Dufo, 1840 accepted as Isognomon nucleus (Lamarck, 1819) (junior subjective synonym)
71. Species Perna samoensis Baird, 1873 accepted as Isognomon perna (Linnaeus, 1767)
72. Species Perna soldanii Deshayes, 1836 † accepted as Isognomon maxillatus (Lamarck, 1801) † (unaccepted > junior subjective synonym)
73. Species Perna spathulata Reeve, 1858 accepted as Isognomon ephippium (Linnaeus, 1758)
74. Species Perna spengleri Lynge, 1909 accepted as Isognomon legumen (Gmelin, 1791)
75. Species Perna staadti Cossmann, 1907 † accepted as Isognomon staadti (Cossmann, 1907) † (unaccepted > superseded combination)
76. Species Perna sulcata Lamarck, 1819 accepted as Isognomon perna (Linnaeus, 1767)
77. Species Perna torva A. Gould, 1850 accepted as Isognomon legumen (Gmelin, 1791)
78. Species Perna tranquebarensis Leach, 1815 accepted as Isognomon isognomum (Linnaeus, 1758)
79. Species Perna varnensis Toula, 1892 † accepted as Isognomon varnensis (Toula, 1892) † (unaccepted > superseded combination)
80. Species Perna vespertilio Reeve, 1858 accepted as Isognomon isognomum (Linnaeus, 1758)
81. Species Perna vitrea Reeve, 1858 accepted as Isognomon californicum (Conrad, 1837) accepted as Isognomon californicus (Conrad, 1837)
82. Species Perna vulsella Lamarck, 1819 accepted as Isognomon legumen (Gmelin, 1791)
83. Species Perna vulsella Lamarck, 1819, sensu Reeve, 1858 accepted as Isognomon isognomum (Linnaeus, 1758) (misapplication)
84. Species Perna coolyenensis Feldtmann, 1963 † (uncertain > unassessed)
85. Species Perna crassitesta Münster, 1835 † (uncertain > unassessed)
86. Species Perna fontannesi G. Boehm, 1883 † (uncertain > unassessed)
87. Species Perna fragilis Sharpe, 1850 † (uncertain > unassessed)
88. Species Perna gemmellaroi G. Boehm, 1883 † (uncertain > unassessed)
89. Species Perna meleagrinoides Hislop, 1860 † (uncertain > unassessed)
90. Species Perna orientalis Hamlin, 1884 † (uncertain > unassessed)
91. Species Perna petaloidea C. A. White, 1887 † (uncertain > unassessed)
92. Species Perna quadrata J. De C. Sowerby, 1825 † (uncertain > unassessed)
93. Species Perna quadrisulcata Ihering, 1897 † (uncertain > unassessed)
94. Species Perna rauliniana A. d'Orbigny, 1846 † (uncertain > unassessed)
95. Species Perna royana A. d'Orbigny, 1846 † (uncertain > unassessed)
96. Species Perna serratula Reeve, 1858 (uncertain > nomen dubium)
97. Species Perna steinmanni G. Boehm, 1883 † (uncertain > unassessed)
98. Species Perna tetragona Hamlin, 1884 † (uncertain > unassessed)
99. Species Perna vetusta Goldfuss, 1833 † (uncertain > unassessed)

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