1. Species Ostraea affinis G. B. Sowerby II, 1871 accepted as Dendostrea folium (Linnaeus, 1758)
2. Species Ostraea algoensis G. B. Sowerby II, 1871 accepted as Ostrea algoensis G. B. Sowerby II, 1871
3. Species Ostraea angasii G. B. Sowerby II, 1871 accepted as Ostrea angasi G. B. Sowerby II, 1871 (unaccepted > superseded combination)
4. Species Ostraea angulata (Lamarck, 1819), sensu G. B. Sowerby II, 1871 accepted as Magallana bilineata (Röding, 1798)
5. Species Ostraea arakanensis G. B. Sowerby II, 1871 accepted as Saccostrea echinata (Quoy & Gaimard, 1835)
6. Species Ostraea attenuata G. B. Sowerby II, 1871 accepted as Saccostrea circumsuta (Gould, 1850)
7. Species Ostraea auriculata G. B. Sowerby II, 1871 accepted as Ostrea denselamellosa Lischke, 1869
8. Species Ostraea barclayana G. B. Sowerby II, 1871 accepted as Saccostrea spathulata (Lamarck, 1819)
9. Species Ostraea belcheri G. B. Sowerby II, 1871 accepted as Magallana belcheri (G. B. Sowerby II, 1871) (original combination)
10. Species Ostraea cerata G. B. Sowerby II, 1871 accepted as Parahyotissa numisma (Lamarck, 1819) accepted as Hyotissa numisma (Lamarck, 1819)
11. Species Ostraea chiloensis G. B. Sowerby II, 1871 accepted as Ostrea chilensis Küster, 1844 (junior subjective synonym)
12. Species Ostraea crenulifera G. B. Sowerby II, 1871 accepted as Dendostrea crenulifera (G. B. Sowerby II, 1871) (unaccepted > superseded combination)
13. Species Ostraea cymbaeformis G. B. Sowerby II, 1871 accepted as Crassostrea gigas (Thunberg, 1793) accepted as Magallana gigas (Thunberg, 1793) (junior subjective synonym)
14. Species Ostraea dubia G. B. Sowerby II, 1871 accepted as Dendostrea folium (Linnaeus, 1758)
15. Species Ostraea floridensis G. B. Sowerby II, 1871 accepted as Crassostrea virginica (Gmelin, 1791)
16. Species Ostraea hanleyana G. B. Sowerby II, 1871 accepted as Parahyotissa numisma (Lamarck, 1819) accepted as Hyotissa numisma (Lamarck, 1819)
17. Species Ostraea inaequivalvis G. B. Sowerby II, 1871 accepted as Hyotissa numisma (Lamarck, 1819)
18. Species Ostraea inermis G. B. Sowerby II, 1871 accepted as Hyotissa inermis (G. B. Sowerby II, 1871) (original combination)
19. Species Ostraea lactea G. B. Sowerby II, 1871 accepted as Alectryonella plicatula (Gmelin, 1791)
20. Species Ostraea lentiginosa G. B. Sowerby II, 1871 accepted as Parahyotissa numisma (Lamarck, 1819) accepted as Hyotissa numisma (Lamarck, 1819)
21. Species Ostraea lima G. B. Sowerby II, 1871 accepted as Neopycnodonte cochlear (Poli, 1795)
22. Species Ostraea lugubris G. B. Sowerby II, 1871 accepted as Magallana bilineata (Röding, 1798)
23. Species Ostraea mexicana G. B. Sowerby II, 1871 accepted as Saccostrea palmula (P. P. Carpenter, 1857)
24. Species Ostraea multicostata G. B. Sowerby II, 1871 accepted as Ostrea denselamellosa Lischke, 1869
25. Species Ostraea multiradiata G. B. Sowerby II, 1871 accepted as Ostrea denselamellosa Lischke, 1869
26. Species Ostraea nigromarginata G. B. Sowerby II, 1871 accepted as Saccostrea echinata (Quoy & Gaimard, 1835)
27. Species Ostraea nobilis G. B. Sowerby II, 1871 accepted as Parahyotissa inermis (G. B. Sowerby II, 1871) accepted as Hyotissa inermis (G. B. Sowerby II, 1871)
28. Species Ostraea obesa G. B. Sowerby II, 1871 accepted as Ostrea stentina Payraudeau, 1826
29. Species Ostraea ochracea G. B. Sowerby II, 1871 accepted as Crassostrea columbiensis (Hanley, 1846)
30. Species Ostraea palmipes G. B. Sowerby II, 1871 accepted as Planostrea pestigris (Hanley, 1846)
31. Species Ostraea parasitica Gmelin, 1791 sensu G. B. Sowerby II, 1870 accepted as Crassostrea tulipa (Lamarck, 1819) (misapplication)
32. Species Ostraea permollis G. B. Sowerby II, 1871 accepted as Ostrea permollis G. B. Sowerby II, 1871 (Misspelled genus)
33. Species Ostraea plicata Chemnitz, 1785 sensu G. B. Sowerby II, 1871 accepted as Dendostrea rosacea (Deshayes, 1836) (misapplication)
34. Species Ostraea prevostii G. B. Sowerby II, 1871 accepted as Ostrea stentina Payraudeau, 1826
35. Species Ostraea pseudocrassissima T. Fuchs, 1878 † accepted as Crassostrea gryphoides (Schlotheim, 1813) † (unaccepted > junior subjective synonym)
36. Species Ostraea quercinus G. B. Sowerby II, 1871 accepted as Hyotissa quercinus (G. B. Sowerby II, 1871) (original combination)
37. Species Ostraea radix G. B. Sowerby II, 1871 accepted as Dendostrea cristata (Born, 1778)
38. Species Ostraea reniformis G. B. Sowerby II, 1871 accepted as Crassostrea virginica (Gmelin, 1791)
39. Species Ostraea rostralis Lamarck, 1819, sensu G. B. Sowerby II, 1871 accepted as Crassostrea gigas (Thunberg, 1793) accepted as Magallana gigas (Thunberg, 1793) (misapplication)
40. Species Ostraea rostrata Chemnitz, 1785 sensu G. B. Sowerby II, 1871 accepted as Crassostrea virginica (Gmelin, 1791) (misapplication)
41. Species Ostraea sandvichensis G. B. Sowerby II, 1871 accepted as Dendostrea sandvichensis (G. B. Sowerby II, 1871) (original combination)
42. Species Ostraea solida G. B. Sowerby II, 1871 accepted as Alectryonella plicatula (Gmelin, 1791)
43. Species Ostraea spathulata Lamarck, 1819, sensu G. B. Sowerby II, 1871 accepted as Striostrea prismatica (Gray, 1825) (misapplication)
44. Species Ostraea subtrigona G. B. Sowerby II, 1871 accepted as Saccostrea subtrigona (G. B. Sowerby II, 1871)
45. Species Ostraea tubercularis G. B. Sowerby II, 1871 accepted as Ostrea denselamellosa Lischke, 1869
46. Species Ostraea tulipa Lamarck, 1819, sensu G. B. Sowerby II, 1871 accepted as Crassostrea rhizophorae (Guilding, 1828) (misapplication)
47. Species Ostraea vitrefacta G. B. Sowerby II, 1871 accepted as Saccostrea spathulata (Lamarck, 1819)
48. Species Ostraea acuticosta Nyst & Galeotti, 1840 † (uncertain > unassessed)
49. Species Ostraea lincolnensis C. E. Weaver, 1916 † (uncertain > unassessed)
50. Species Ostraea retusa G. B. Sowerby II, 1871 † (uncertain > taxon inquirendum, use in recent liteature currently undocumented)
51. Species Ostraea similis Nyst & Galeotti, 1840 † (uncertain > unassessed)

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