1. Species Orthoceras regulare (Schlotheim, 1820) †
2. Species Orthoceras avelinii Salter, 1854 † accepted as Michelinoceras avelinii (Salter, 1854) † (unaccepted > superseded combination)
3. Species Orthoceras caereesiense Hicks, 1875 † accepted as Michelinoceras avelinii (Salter, 1854) † (unaccepted > junior subjective synonym)
4. Species Orthoceras chinianense Thoral, 1935 † accepted as Saloceras chinianense (Thoral, 1935) † (unaccepted > superseded combination)
5. Species Orthoceras conicum J. De C. Sowerby, 1839 † accepted as Armenoceras subconicum (A. d'Orbigny, 1850) † (invalid; name preoccupied)
6. Species Orthoceras coreanicum Kobayashi, 1928 † accepted as Holmiceras coreanicum (Kobayashi, 1928) † (unaccepted > superseded combination)
7. Species Orthoceras elegans Münster, 1841 † accepted as Trematoceras elegans (Münster, 1841) † (unaccepted > superseded combination)
8. Species Orthoceras escandei Thoral, 1935 † accepted as Rioceras escandei (Thoral, 1935) † (unaccepted > superseded combination)
9. Species Orthoceras estivali Thoral, 1935 † accepted as Saloceras chinianense (Thoral, 1935) † (unaccepted > junior subjective synonym)
10. Species Orthoceras festinans Blake, 1882 † accepted as Dideroceras festinans (Blake, 1882) † (unaccepted > superseded combination, original combination)
11. Species Orthoceras gorbyi Miller, 1894 † accepted as Gorbyoceras gorbyi (Miller, 1894) † (unaccepted > superseded combination)
12. Species Orthoceras makkolense Kobayashi, 1928 † accepted as Sactorthoceras makkolense (Kobayashi, 1928) † (unaccepted > superseded combination)
13. Species Orthoceras martyi Thoral, 1935 † accepted as Annbactroceras martyi (Thoral, 1935) † (unaccepted > superseded combination)
14. Species Orthoceras michelini Barrande, 1866 † accepted as Michelinoceras michelini (Barrande, 1866) † (unaccepted > superseded combination, original combination)
15. Species Orthoceras mourguesi Thoral, 1935 † accepted as Bactroceras mourguesi (Thoral, 1935) † (unaccepted > superseded combination)
16. Species Orthoceras nummularium J. De C. Sowerby, 1839 † accepted as Armenoceras nummularium (J. De C. Sowerby, 1839) † (unaccepted > superseded combination)
17. Species Orthoceras pradense Thoral, 1935 † accepted as Saloceras pradense (Thoral, 1935) † (unaccepted > superseded combination)
18. Species Orthoceras sericeum Salter, 1866 † accepted as Saloceras sericeum (Salter, 1866) † (original combination)
19. Species Orthoceras subcampanile Kiparisova, 1954 † accepted as Trematoceras subcampanile (Kiparisova, 1954) † (unaccepted > superseded combination)
20. Species Orthoceras annulocostatum Meek & Worthen, 1861 † (uncertain > unassessed)
21. Species Orthoceras isogramma Meek, 1871 † (uncertain > unassessed)
22. Species Orthoceras kinnekullense Foord, 1887 † (uncertain > unassessed)
23. Species Orthoceras liaotungense Endo, 1932 † (uncertain > unassessed)
24. Species Orthoceras magnichinense Endo, 1932 † (uncertain > unassessed)
25. Species Orthoceras mendax Salter, 1859 † (uncertain > unassessed)
26. Species Orthoceras menelaus Billings, 1862 † (uncertain > unassessed)
27. Species Orthoceras perparvum Billings, 1862 † (uncertain > unassessed)
28. Species Orthoceras politum McCoy, 1851 † (uncertain > unassessed)
29. Species Orthoceras rectiseptatum Endo, 1932 † (uncertain > unassessed)
30. Species Orthoceras revalense Foord, 1887 † (uncertain > unassessed)
31. Species Orthoceras toyamai Endo, 1932 † (uncertain > unassessed)

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