Cyrtoceras baffinensis
Cyrtoceras cambria
Cyrtoceras cessator
Cyrtoceras cinctutum
Cyrtoceras cincutum
Cyrtoceras clintonense
Cyrtoceras cornulum
Cyrtoceras corydon
Cyrtoceras dactyloides
Cyrtoceras dubium
Cyrtoceras elfina
Cyrtoceras expansum
Cyrtoceras gracilis
Cyrtoceras hector
Cyrtoceras hitzi
Cyrtoceras minneapolis
Cyrtoceras nevadense
Cyrtoceras orodes
Cyrtoceras peculiare
Cyrtoceras rectum
Cyrtoceras thompsoni
Cyrtoceras vallandighami