1. Species Protocardia appressa (Gabb, 1877) †
2. Species Protocardia argoviana (Mayer[-Eymar], 1865) †
3. Species Protocardia aurilitoralis L. R. Cox, 1952 †
4. Species Protocardia broilii Yanin, 2020 †
5. Species Protocardia browni (Etheridge, 1902) †
6. Species Protocardia carinata Yanin, 2021 †
7. Species Protocardia chebeikana Freneix, 1972 †
8. Species Protocardia collinea (Buvignier, 1852) †
9. Species Protocardia comes (Coquand, 1865) †
10. Species Protocardia coronaensis (E. L. Packard, 1922) †
11. Species Protocardia costaricensis Olsson, 1922 †
12. Species Protocardia crassicostata F. Vogel, 1896 †
13. Species Protocardia dissimilis (J. De C. Sowerby, 1827) †
14. Species Protocardia dyonisea (Buvignier, 1852) †
15. Species Protocardia gigantea S. Schneider, Fürsich & Werner, 2010 †
16. Species Protocardia goradongarensis Fürsich, Heinze & Jaitly, 2000 †
17. Species Protocardia granulifera (Gabb, 1869) †
18. Species Protocardia hillana (J. Sowerby, 1813) †
19. Species Protocardia ibukii Nakazawa & Murata, 1966 †
20. Species Protocardia intexta (Münster, 1837) †
21. Species Protocardia keenae C. S. P. Singh & Rai, 1980 †
22. Species Protocardia lepida (Sauvage & Rigaux, 1872) †
23. Species Protocardia major (J. De C. Sowerby, 1836) †
24. Species Protocardia miles (Coquand, 1865) †
25. Species Protocardia milleri (Gabb, 1881) †
26. Species Protocardia moabitica (Lartet, 1873) †
27. Species Protocardia multiformis F. Vogel, 1896 †
28. Species Protocardia newberryana (Gabb, 1881) †
29. Species Protocardia paffenholzi Bobkova, 1949 †
30. Species Protocardia peraltaensis Fürsich & Werner, 1985 †
31. Species Protocardia peregrinorsum (A. d'Orbigny, 1843) †
32. Species Protocardia pesolina (Contejean, 1860) †
33. Species Protocardia placerensis (Gabb, 1864) †
34. Species Protocardia praecalva Dubar, 1948 †
35. Species Protocardia purbeckensis (de Loriol, 1865) †
36. Species Protocardia qinghaiensis S.-X. Wen, 1979 †
37. Species Protocardia remondiana (Gabb, 1864) †
38. Species Protocardia renngarteni Bobkova, 1949 †
39. Species Protocardia reticulata Repin, 2001 †
40. Species Protocardia rhaetica (Merian, 1853) †
41. Species Protocardia semidecussata (Koenen, 1885) †
42. Species Protocardia semipunctata (Münster, 1837) †
43. Species Protocardia shehuenensis Feruglio, 1936 †
44. Species Protocardia spillmani (Conrad, 1858) †
45. Species Protocardia stantoni (Wade, 1926) †
46. Species Protocardia striatula (J. De C. Sowerby, 1827) †
47. Species Protocardia stricklandi (J. Morris & Lycett, 1853) †
48. Species Protocardia subtrigona (J. Morris & Lycett, 1853) †
49. Species Protocardia tenuicostata F. Vogel, 1896 †
50. Species Protocardia translucida (Gabb, 1869) †
51. Species Protocardia truncata (J. De C. Sowerby, 1827) †
52. Species Protocardia valbertensis de Loriol, 1901 †
53. Species Protocardia vindovera Pacaud, 2024 †
54. Species Protocardia wapeti L. R. Cox, 1961 †
55. Species Protocardia wopfneri Ludbrook, 1966 †
56. Species Protocardia anglica H. Woods, 1908 † (uncertain > unassessed)
57. Species Protocardia hepingxiangensis J.-H. Chen & M.-J. Lin, 1976 † (uncertain > unassessed)
58. Species Protocardia jacksonense Mansfield, 1932 † (uncertain > unassessed)
59. Species Protocardia morii Hayami, 1960 † (uncertain > unassessed)
60. Species Protocardia parahillana Wade, 1926 † (uncertain > unassessed)
61. Species Protocardia pusilla Chiplonkar, 1939 † (uncertain > unassessed)
62. Species Protocardia schencki G. Müller, 1900 † (uncertain > unassessed)
63. Species Protocardia schucherti McLearn, 1924 † (uncertain > unassessed)
64. Species Protocardia somaliensis L. R. Cox, 1935 † (uncertain > unassessed)
65. 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)
66. 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)
67. Subgenus Protocardia (Nemocardium) F. B. Meek, 1876 accepted as Nemocardium F. B. Meek, 1876 (unaccepted > superseded rank)
    1. Species Protocardia (Nemocardium) alata Suter, 1917 † accepted as Nemocardium patulum (F. W. Hutton, 1873) † (junior subjective synonym)
68. Species Protocardia actia J. A. Gardner, 1935 † accepted as Nemocardium actium (J. A. Gardner, 1935) † (unaccepted > superseded combination)
69. Species Protocardia alata Suter, 1917 † accepted as Nemocardium patulum (F. W. Hutton, 1873) † (junior subjective synonym)
70. Species Protocardia curta Conrad, 1869 † accepted as Nemocardium curtum (Conrad, 1869) † (unaccepted > superseded combination)
71. Species Protocardia gambrina Gabb, 1861 † accepted as Nemocardium gambrinum (Gabb, 1861) † (unaccepted > superseded combination)
72. Species Protocardia gurabica Maury, 1917 † accepted as Lophocardium gurabicum (Maury, 1917) † (unaccepted > superseded combination)
73. Species Protocardia harrisi Dall, 1900 † accepted as Nemocardium harrisi (Dall, 1900) † (unaccepted > superseded combination)
74. Species Protocardia impressa (Leymerie, 1842) † accepted as Protocardia vindovera Pacaud, 2024 † (unaccepted > junior homonym)
75. Species Protocardia islahispaniolae Maury, 1917 † accepted as Microcardium islahispaniolae (Maury, 1917) † (unaccepted > superseded combination)
76. Species Protocardia jamaicensis Dall, 1900 † accepted as Microcardium jamaicense (Dall, 1900) † (unaccepted > superseded combination)
77. Species Protocardia ornithopetronica Chapman & Crespin, 1928 † accepted as Pratulum ornithopetronica (Chapman & Crespin, 1928) † (unaccepted > superseded combination)
78. Species Protocardia panamensis Dall, 1908 accepted as Microcardium panamense (Dall, 1908) (unaccepted > superseded combination)
79. Species Protocardia paziana Dall, 1916 accepted as Microcardium pazianum (Dall, 1916) (unaccepted > superseded combination)
80. Species Protocardia quihi J. A. Gardner, 1935 † accepted as Nemocardium quihi (J. A. Gardner, 1935) † (unaccepted > superseded combination)
81. Species Protocardia rengarteni [sic] † accepted as Protocardia renngarteni Bobkova, 1949 † (unaccepted > misspelling - incorrect subsequent spelling)
82. Species Protocardia salrivalis G. D. Harris, 1919 † accepted as Nemocardium salrivale (G. D. Harris, 1919) † (unaccepted > superseded combination)
83. Subgenus Protocardia (Pachycardium) Conrad, 1869 † represented as Protocardia Beyrich, 1845 †
    1. Species Protocardia (Pachycardium) coronaensis (E. L. Packard, 1922) † represented as Protocardia coronaensis (E. L. Packard, 1922) †
    2. Species Protocardia (Pachycardium) remondiana (Gabb, 1864) † represented as Protocardia remondiana (Gabb, 1864) †
    3. Species Protocardia (Pachycardium) spillmani (Conrad, 1858) † represented as Protocardia spillmani (Conrad, 1858) †
84. 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 †

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