1. Species Cyrtoceras angustum Gürich, 1896 † (uncertain > unassessed)
2. Species Cyrtoceras gracilis Cleland, 1903 † (uncertain > unassessed, incorrect gender of species epithet)
3. Species Cyrtoceras kontkiewiczi Gürich, 1896 † (uncertain > unassessed)
4. Species Cyrtoceras lagowiense Gürich, 1896 † (uncertain > unassessed)
5. Species Cyrtoceras minneapolis J. M. Clarke, 1897 † (uncertain > unassessed)
6. Species Cyrtoceras polonicum Gürich, 1896 † (uncertain > unassessed)
7. Species Cyrtoceras subrectum J. Hall, 1859 † (uncertain > unassessed)
8. Species Cyrtoceras teres F. A. Roemer, 1843 † (uncertain > unassessed)
9. Species Cyrtoceras tuberculatum F. McCoy, 1844 † (uncertain > unassessed)
10. Subgenus Cyrtoceras (Piloceras) Salter, 1859 † accepted as Piloceras Salter, 1859 † (unaccepted > superseded rank)
    1. Species Cyrtoceras (Piloceras) invaginatum Salter, 1859 † accepted as Piloceras invaginatum Salter, 1859 † (unaccepted > superseded combination)
11. Species Cyrtoceras acies Barrande, 1866 † accepted as Lepidoceras lepidum (Barrande, 1866) † (unaccepted > junior subjective synonym)
12. Species Cyrtoceras acinacellum Whitfield, 1886 † accepted as Bassleroceras acinacellum (Whitfield, 1886) † (unaccepted > superseded combination)
13. Species Cyrtoceras acus de Koninck, 1880 † accepted as Pseudocyrtoceras acus (de Koninck, 1880) † (unaccepted > superseded combination)
14. Species Cyrtoceras alethes Billings, 1865 † accepted as Bassleroceras alethes (Billings, 1865) † (unaccepted > superseded combination)
15. Species Cyrtoceras alternans Tietze, 1871 † accepted as Dasbergoceras alternans (Tietze, 1871) † (unaccepted > superseded combination)
16. Species Cyrtoceras amoenum S. A. Miller, 1878 † accepted as Beloitoceras amoenum (S. A. Miller, 1878) † (unaccepted > superseded combination)
17. Species Cyrtoceras antilope de Koninck, 1880 † accepted as Bergoceras antilope (de Koninck, 1880) † (unaccepted > superseded combination)
18. Species Cyrtoceras aristides Billings, 1865 † accepted as Bassleroceras aristides (Billings, 1865) † (unaccepted > superseded combination)
19. Species Cyrtoceras beekmanensis Whitfield, 1889 † accepted as Bassleroceras beekmanense (Whitfield, 1889) † (unaccepted > superseded combination)
20. Species Cyrtoceras bolli Barrande, 1877 † accepted as Pseudorutoceras bolli (Barrande, 1877) † (unaccepted > superseded combination)
21. Species Cyrtoceras cambria Walcott, 1905 † accepted as Plectronoceras cambria (Walcott, 1905) † (unaccepted > superseded combination)
22. Species Cyrtoceras confertissimum Whitfield, 1886 † accepted as Lawrenceoceras confertissimum (Whitfield, 1886) † (unaccepted > superseded combination)
23. Species Cyrtoceras constringens Barrande, 1866 † accepted as Chromatoceras constringens (Barrande, 1866) † (unaccepted > superseded combination)
24. Species Cyrtoceras corniculum J. Hall, 1862 † accepted as Cyrtoceras tenuistriatum J. Hall, 1877 † accepted as Laphamoceras tenuistriatum (J. Hall, 1877) † (unaccepted > junior homonym, of Cyrtoceras corniculum Eichwald, 1860; C. tenuistriatum J. Hall, 1877 is a replacement name)
25. Species Cyrtoceras cornu de Koninck, 1880 † accepted as Pseudocyrtoceras cornu (de Koninck, 1880) † (unaccepted > superseded combination)
26. Species Cyrtoceras curtum F. B. Meek & Worthen, 1861 † accepted as Brachycycloceras curtum (F. B. Meek & Worthen, 1861) † (unaccepted > superseded combination)
27. Species Cyrtoceras dactyloides Dwight, 1884 † accepted as Dwightoceras dactyloides (Dwight, 1884) † (unaccepted > superseded combination)
28. Species Cyrtoceras decurio Barrande, 1866 † accepted as Euryrizoceras decurio (Barrande, 1866) † (unaccepted > superseded combination)
29. Species Cyrtoceras dictys Billings, 1865 † accepted as Dyscritoceras dictys (Billings, 1865) † (unaccepted > superseded combination)
30. Species Cyrtoceras dilatatum F. B. Meek & Worthen, 1861 † accepted as Brachycycloceras curtum (F. B. Meek & Worthen, 1861) † (unaccepted > junior subjective synonym)
31. Species Cyrtoceras dresbachense Sardeson, 1896 † accepted as Ectenoceras dresbachense (Sardeson, 1896) † (unaccepted > superseded combination)
32. Species Cyrtoceras ellipticum Lossen, 1860 † accepted as Phthanoncoceras ellipticum (Lossen, 1860) † (unaccepted > superseded combination)
33. Species Cyrtoceras forbesi Barrande, 1866 † accepted as Richardsonoceras forbesi (Barrande, 1866) † (unaccepted > superseded combination)
34. Species Cyrtoceras fragile Barrande, 1866 † accepted as Lepidoceras lepidum (Barrande, 1866) † (unaccepted > junior subjective synonym)
35. Species Cyrtoceras fraternum Barrande, 1866 † accepted as Richardsonoceras fraternum (Barrande, 1866) † (unaccepted > superseded combination)
36. Species Cyrtoceras geinitzi Barrande, 1866 † accepted as Oonoceras geinitzi (Barrande, 1866) † (unaccepted > superseded combination)
37. Species Cyrtoceras gracile Cleland, 1903 † accepted as Dakeoceras gracile (Cleland, 1903) † (unaccepted > superseded combination)
38. Species Cyrtoceras huronense Billings, 1865 † accepted as Beloitoceras huronense (Billings, 1865) † (unaccepted > superseded combination)
39. Species Cyrtoceras impatiens Barrande, 1866 † accepted as Oonoceras impatiens (Barrande, 1866) † (unaccepted > superseded combination)
40. Species Cyrtoceras jason J. Hall, 1879 † accepted as Rutoceras jason (J. Hall, 1879) † (unaccepted > superseded combination)
41. Species Cyrtoceras kirbyi Whitfield, 1889 † accepted as Bassleroceras kirbyi (Whitfield, 1889) † (unaccepted > superseded combination)
42. Species Cyrtoceras lepidum Barrande, 1866 † accepted as Lepidoceras lepidum (Barrande, 1866) † (unaccepted > superseded combination)
43. Species Cyrtoceras loculosum Hall, 1861 † accepted as Oneotoceras loculosum (Hall, 1861) † (unaccepted > superseded combination)
44. Species Cyrtoceras longitudinale Angelin, 1880 † accepted as Warburgoceras longitudinale (Angelin, 1880) † (unaccepted > superseded combination)
45. Species Cyrtoceras luthei S. Calvin, 1892 † accepted as Clarkoceras luthei (S. Calvin, 1892) † (unaccepted > superseded combination)
46. Species Cyrtoceras lysander Billings, 1865 † accepted as Manitoulinoceras lysander (Billings, 1865) † (unaccepted > superseded combination)
47. Species Cyrtoceras metellus Billings, 1865 † accepted as Dyscritoceras metellus (Billings, 1865) † (unaccepted > superseded combination)
48. Species Cyrtoceras microscopicum W. B. Dwight, 1884 † accepted as Bassleroceras microscopicum (W. B. Dwight, 1884) † (unaccepted > superseded combination)
49. Species Cyrtoceras mimus Barrande, 1868 † accepted as Lepidoceras lepidum (Barrande, 1866) † (unaccepted > junior subjective synonym)
50. Species Cyrtoceras missisquoi (Billings, 1865) † accepted as Kirkoceras missisquoi (Billings, 1865) † (unaccepted > superseded combination)
51. Species Cyrtoceras nepotulus Barrande, 1877 † accepted as Parauloceras pupus (Barrande, 1877) † (unaccepted > junior subjective synonym)
52. Species Cyrtoceras normatum Barrande, 1877 † accepted as Euryrizocerina normata (Barrande, 1877) † (unaccepted > superseded combination)
53. Species Cyrtoceras peculiare Girty, 1911 † accepted as Brachycycloceras curtum (F. B. Meek & Worthen, 1861) † (unaccepted > junior subjective synonym)
54. Species Cyrtoceras praecox Salter, 1866 † accepted as Dakeoceras praecox (Salter, 1866) † (unaccepted > superseded combination)
55. Species Cyrtoceras priscum Eichwald, 1860 † accepted as Richardsonoceras priscum (Eichwald, 1860) † (unaccepted > superseded combination)
56. Species Cyrtoceras pupus Barrande, 1877 † accepted as Parauloceras pupus (Barrande, 1877) † (unaccepted > superseded combination)
57. Species Cyrtoceras quebecense Whiteaves, 1898 † accepted as Quebecoceras quebecense (Whiteaves, 1898) † (unaccepted > superseded combination)
58. Species Cyrtoceras raei Whitfield, 1889 † accepted as Seelyoceras raei (Whitfield, 1889) † (unaccepted > superseded combination)
59. Species Cyrtoceras sica Barrande, 1866 † accepted as Chromatoceras veteranum (Barrande, 1866) † (unaccepted > junior subjective synonym)
60. Species Cyrtoceras spissiseptum W. B. Dwight, 1884 † accepted as Bassleroceras spissiseptum (W. B. Dwight, 1884) † (unaccepted > superseded combination)
61. Species Cyrtoceras surgens Barrande, 1870 † accepted as Lawrenceoceras surgens (Barrande, 1870) † (unaccepted > superseded combination)
62. Species Cyrtoceras syphax Billings, 1865 † accepted as Eremoceras syphax (Billings, 1865) † (unaccepted > superseded combination)
63. Species Cyrtoceras tenuistriatum J. Hall, 1877 † accepted as Laphamoceras tenuistriatum (J. Hall, 1877) † (unaccepted > superseded combination)
64. Species Cyrtoceras uranus Barrande, 1866 † accepted as Uranoceras uranus (Barrande, 1866) † (unaccepted > superseded combination)
65. Species Cyrtoceras vassarina W. B. Dwight, 1884 † accepted as Bassleroceras vassarina (W. B. Dwight, 1884) † (unaccepted > superseded combination)
66. Species Cyrtoceras veteranum Barrande, 1866 † accepted as Chromatoceras veteranum (Barrande, 1866) † (unaccepted > superseded combination)
67. Species Cyrtoceras winonicum Sardeson, 1896 † accepted as Ectenolites winonicum (Sardeson, 1896) † (unaccepted > superseded combination)

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