1. Species Protocardia argoviana (Mayer, 1865) †
2. Species Protocardia aurilitoralis Cox, 1952 †
3. Species Protocardia broilii Yanin, 2020 †
4. Species Protocardia carinata Yanin, 2021 †
5. Species Protocardia chebeikana Freneix, 1972 †
6. Species Protocardia collinea (Buvignier, 1852) †
7. Species Protocardia costaricensis Olsson, 1922 †
8. Species Protocardia crassicostata F. Vogel, 1896 †
9. Species Protocardia dissimilis (J. De C. Sowerby, 1827) †
10. Species Protocardia dyonisea (Buvignier, 1852) †
11. Species Protocardia gigantea S. Schneider, Fürsich & Werner, 2010 †
12. Species Protocardia goradongarensis Fürsich, Heinze & Jaitly, 2000 †
13. Species Protocardia hillana (J. Sowerby, 1813) †
14. Species Protocardia ibukii Nakazawa & Murata, 1966 †
15. Species Protocardia intexta (Münster, 1837) †
16. Species Protocardia keenae C. S. P. Singh & Rai, 1980 †
17. Species Protocardia lepida (Sauvage & Rigaux, 1872) †
18. Species Protocardia major (J. De C. Sowerby, 1836) †
19. Species Protocardia multiformis F. Vogel, 1896 †
20. Species Protocardia paffenholzi Bobkova, 1949 †
21. Species Protocardia peraltaensis Fürsich & Werner, 1985 †
22. Species Protocardia peregrinorsum (A. d'Orbigny, 1843) †
23. Species Protocardia pesolina (Contejean, 1860) †
24. Species Protocardia praecalva Dubar, 1948 †
25. Species Protocardia purbeckensis (de Loriol, 1865) †
26. Species Protocardia qinghaiensis S.-X. Wen, 1979 †
27. Species Protocardia renngarteni Bobkova, 1949 †
28. Species Protocardia reticulata Repin, 2001 †
29. Species Protocardia rhaetica (Merian, 1853) †
30. Species Protocardia semipunctata (Münster, 1837) †
31. Species Protocardia stantoni (Wade, 1926) †
32. Species Protocardia striatula (J. De C. Sowerby, 1827) †
33. Species Protocardia stricklandi (J. Morris & Lycett, 1853) †
34. Species Protocardia subtrigona (J. Morris & Lycett, 1853) †
35. Species Protocardia tenuicostata F. Vogel, 1896 †
36. Species Protocardia truncata (J. De C. Sowerby, 1827) †
37. Species Protocardia valbertensis de Loriol, 1901 †
38. Species Protocardia vindovera Pacaud, 2024 †
39. Subgenus Protocardia (Globocardium) Hayami, 1965 † accepted as Globocardium Hayami, 1965 † (unaccepted > superseded rank)
    1. Species Protocardia (Globocardium) sphaeroidea (Forbes, 1845) † accepted as Globocardium sphaeroideum (Forbes, 1845) † (unaccepted > superseded combination)
40. Subgenus Protocardia (Lophocardium) P. Fischer, 1887 accepted as Lophocardium P. Fischer, 1887 (unaccepted > superseded rank)
    1. Species Protocardia (Lophocardium) gurabica Maury, 1917 † accepted as Lophocardium gurabicum (Maury, 1917) † (unaccepted > superseded rank)
41. Subgenus Protocardia (Nemocardium) Meek, 1876 accepted as Nemocardium Meek, 1876 (unaccepted > superseded rank)
    1. Species Protocardia (Nemocardium) alata Suter, 1917 † accepted as Nemocardium patulum (F. W. Hutton, 1873) † (junior subjective synonym)
42. Species Protocardia actia J. A. Gardner, 1935 † accepted as Nemocardium actium (J. A. Gardner, 1935) † (unaccepted > superseded combination)
43. Species Protocardia alata Suter, 1917 † accepted as Nemocardium patulum (F. W. Hutton, 1873) † (junior subjective synonym)
44. Species Protocardia gambrina Gabb, 1861 † accepted as Nemocardium gambrinum (Gabb, 1861) † (unaccepted > superseded combination)
45. Species Protocardia gurabica Maury, 1917 † accepted as Lophocardium gurabicum (Maury, 1917) † (unaccepted > superseded combination)
46. Species Protocardia impressa (Leymerie, 1842) † accepted as Protocardia vindovera Pacaud, 2024 † (unaccepted > junior homonym)
47. Species Protocardia islahispaniolae Maury, 1917 † accepted as Microcardium islahispaniolae (Maury, 1917) † (unaccepted > superseded combination)
48. Species Protocardia jamaicensis Dall, 1900 † accepted as Microcardium jamaicense (Dall, 1900) † (unaccepted > superseded combination)
49. Species Protocardia ornithopetronica Chapman & Crespin, 1928 † accepted as Pratulum ornithopetronica (Chapman & Crespin, 1928) † (unaccepted > superseded combination)
50. Species Protocardia panamensis Dall, 1908 accepted as Microcardium panamense (Dall, 1908) (unaccepted > superseded combination)
51. Species Protocardia paziana Dall, 1916 accepted as Microcardium pazianum (Dall, 1916) (unaccepted > superseded combination)
52. Species Protocardia quihi J. A. Gardner, 1935 † accepted as Nemocardium quihi (J. A. Gardner, 1935) † (unaccepted > superseded combination)
53. Species Protocardia rengarteni [sic] † accepted as Protocardia renngarteni Bobkova, 1949 † (unaccepted > misspelling - incorrect subsequent spelling)
54. Subgenus Protocardia (Protocardia) Beyrich, 1845 † represented as Protocardia Beyrich, 1845 †
    1. Species Protocardia (Protocardia) broili [sic] † accepted as Protocardia broilii Yanin, 2020 † (unaccepted > misspelling - incorrect subsequent spelling)
    2. Species Protocardia (Protocardia) peregrina [sic] † accepted as Protocardia peregrinorsum (A. d'Orbigny, 1843) † (unaccepted > misspelling - incorrect subsequent spelling)
    3. Species Protocardia (Protocardia) carinata Yanin, 2021 † represented as Protocardia carinata Yanin, 2021 †
    4. Species Protocardia (Protocardia) peraltaensis Fürsich & Werner, 1985 † represented as Protocardia peraltaensis Fürsich & Werner, 1985 †
55. Species Protocardia hepingxiangensis J.-H. Chen & M.-J. Lin, 1976 † (uncertain > unassessed)
56. Species Protocardia jacksonense Mansfield, 1932 † (uncertain > unassessed)
57. Species Protocardia morii Hayami, 1960 † (uncertain > unassessed)
58. Species Protocardia shehuenensis Feruglio, 1936 † (uncertain > unassessed)

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