1. Species Cyrtoceras acinacellum Whitfield, 1886 † accepted as Bassleroceras acinacellum (Whitfield, 1886) † (unaccepted > superseded combination)
2. Species Cyrtoceras alethes Billings, 1865 † accepted as Bassleroceras alethes (Billings, 1865) † (unaccepted > superseded combination)
3. Species Cyrtoceras antilope de Koninck, 1880 † accepted as Bergoceras antilope (de Koninck, 1880) † (unaccepted > superseded combination)
4. Species Cyrtoceras bolli Barrande, 1877 † accepted as Pseudorutoceras bolli (Barrande, 1877) † (unaccepted > superseded combination)
5. Species Cyrtoceras cambria Walcott, 1905 † accepted as Plectronoceras cambria (Walcott, 1905) † (unaccepted > superseded combination)
6. Species Cyrtoceras confertissimum Whitfield, 1886 † accepted as Lawrenceoceras confertissimum (Whitfield, 1886) † (unaccepted > superseded combination)
7. Species Cyrtoceras dactyloides Dwight, 1884 † accepted as Dwightoceras dactyloides (Dwight, 1884) † (unaccepted > superseded combination)
8. Species Cyrtoceras dictys Billings, 1865 † accepted as Dyscritoceras dictys (Billings, 1865) † (unaccepted > superseded combination)
9. Species Cyrtoceras ellipticum Lossen, 1860 † accepted as Phthanoncoceras ellipticum (Lossen, 1860) † (unaccepted > superseded combination)
10. Species Cyrtoceras gracile Cleland, 1903 † accepted as Dakeoceras gracile (Cleland, 1903) † (unaccepted > superseded combination)
11. Species Cyrtoceras loculosum Hall, 1861 † accepted as Oneotoceras loculosum (Hall, 1861) † (unaccepted > superseded combination)
12. Species Cyrtoceras metellus Billings, 1865 † accepted as Dyscritoceras metellus (Billings, 1865) † (unaccepted > superseded combination)
13. Species Cyrtoceras nepotulus Barrande, 1877 † accepted as Parauloceras pupus (Barrande, 1877) † (unaccepted > junior subjective synonym)
14. Species Cyrtoceras normatum Barrande, 1877 † accepted as Euryrizocerina normata (Barrande, 1877) † (unaccepted > superseded combination)
15. Species Cyrtoceras pupus Barrande, 1877 † accepted as Parauloceras pupus (Barrande, 1877) † (unaccepted > superseded combination)
16. Species Cyrtoceras syphax Billings, 1865 † accepted as Eremoceras syphax (Billings, 1865) † (unaccepted > superseded combination)
17. Species Cyrtoceras curtum Meek & Worthen, 1861 † (uncertain > unassessed)
18. Species Cyrtoceras dilatatum Meek & Worthen, 1861 † (uncertain > unassessed)
19. Species Cyrtoceras minneapolis J. M. Clarke, 1897 † (uncertain > unassessed)
20. Species Cyrtoceras quebecense Whiteaves, 1898 † (uncertain > unassessed)
21. Species Cyrtoceras subrectum J. Hall, 1859 † (uncertain > unassessed)
22. Species Cyrtoceras tuberculatum F. McCoy, 1844 † (uncertain > unassessed)

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