1. Species Orygoceras arcuatum Dall, 1924 †
2. Species Orygoceras cnemopsis Brusina, 1892 †
3. Species Orygoceras crenulatum Dall, 1924 †
4. Species Orygoceras dentaliforme Brusina, 1882 †
5. Species Orygoceras fistula Brusina, 1893 †
6. Species Orygoceras fuchsi (Kittl, 1886) †
7. Species Orygoceras gorjanovici Pavlović, 1926 †
8. Species Orygoceras idahoense Dall, 1924 †
9. Species Orygoceras intortum Brusina, 1902 †
10. Species Orygoceras levis Gorjanović-Kramberger, 1890 †
11. Species Orygoceras scolecostomum Brusina, 1902 †
12. Species Orygoceras subula Brusina, 1905 †
13. Species Orygoceras tropidophorum Brusina, 1902 †
14. Species Orygoceras tuba Dall, 1924 †
15. Subgenus Orygoceras (Bovillina) Dall, 1924 † accepted as Orygoceras Brusina, 1882 † (unaccepted > junior subjective synonym)
    1. Species Orygoceras (Bovillina) tuba Dall, 1924 † accepted as Orygoceras tuba Dall, 1924 † (subgenus is a junior synonym)
16. Subgenus Orygoceras (Ibicicornu) Dall, 1924 † accepted as Orygoceras Brusina, 1882 † (unaccepted > junior subjective synonym)
    1. Species Orygoceras (Ibicicornu) arcuatum Dall, 1924 † accepted as Orygoceras arcuatum Dall, 1924 † (subgenus is a junior synonym)
    2. Species Orygoceras (Ibicicornu) crenulatum Dall, 1924 † accepted as Orygoceras crenulatum Dall, 1924 † (subgenus is a junior synonym)
    3. Species Orygoceras (Ibicicornu) idahoense Dall, 1924 † accepted as Orygoceras idahoense Dall, 1924 † (subgenus is a junior synonym)
17. Subgenus Orygoceras (Incilicornu) Dall, 1924 † accepted as Orygoceras Brusina, 1882 † (unaccepted > junior subjective synonym)
18. Species Orygoceras bifrons Brusina, 1902 † accepted as Orygoceras dentaliforme Brusina, 1882 † (unaccepted > junior subjective synonym)
19. Species Orygoceras brusinai Gorjanović-Kramberger, 1890 † accepted as Orygoceras fuchsi brusinai Gorjanović-Kramberger, 1890 † (unaccepted > superseded rank)
20. Species Orygoceras corniculum Brusina, 1892 † accepted as Orygoceras fuchsi (Kittl, 1886) † (unaccepted > junior subjective synonym)
21. Species Orygoceras cornucopiae Brusina, 1882 † accepted as Orygoceras dentaliforme Brusina, 1882 † (subjective synonym)
22. Species Orygoceras cultratum Brusina, 1892 † accepted as Orygoceras fuchsi cultratum Brusina, 1892 † (unaccepted > superseded rank)
23. Species Orygoceras curvum Brusina, 1902 † accepted as Orygoceras dentaliforme Brusina, 1882 † (unaccepted > junior subjective synonym)
24. Species Orygoceras euglyphum Brusina, 1902 † accepted as Orygoceras dentaliforme Brusina, 1882 † (unaccepted > junior subjective synonym)
25. Species Orygoceras filocinctum Brusina, 1892 † accepted as Orygoceras fuchsi filocinctum Brusina, 1892 † (unaccepted > superseded rank)
26. Species Orygoceras laevis [sic] † accepted as Orygoceras levis Gorjanović-Kramberger, 1890 † (unaccepted > misspelling - incorrect subsequent spelling)
27. Species Orygoceras leptonema Brusina, 1902 † accepted as Orygoceras dentaliforme Brusina, 1882 † (unaccepted > junior subjective synonym)
28. Species Orygoceras scolecostoma Brusina, 1902 † accepted as Orygoceras scolecostomum Brusina, 1902 † (unaccepted > incorrect grammatical agreement of specific epithet)
29. Species Orygoceras stenonema Brusina, 1882 † accepted as Orygoceras dentaliforme Brusina, 1882 † (junior subjective synonym; incorrect gender)
30. Species Orygoceras stenonemus Brusina, 1882 † accepted as Orygoceras dentaliforme Brusina, 1882 † (subjective synonym)
31. Species Orygoceras tricarinatum Yen, 1944 † accepted as Orygoceras (Ibicicornu) arcuatum Dall, 1924 † accepted as Orygoceras arcuatum Dall, 1924 † (unaccepted > junior subjective synonym)

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