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Genus: Cyrtactinoceras Hyatt in Zittel, 1900 † (DB: 2 SP)
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Cyrtactinoceras mitsuishii
T. Kobayashi, 1928 † (FOSSIL)
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Cyrtactinoceras rebelle
(Barrande, 1866 †) (FOSSIL)
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Genus: Ephippiorthoceras Foerste, 1924 † (DB: 3 SP)
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Ephippiorthoceras frognoeyense
E. Strand, 1933 † (FOSSIL)
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Ephippiorthoceras frognoyense
E. Strand, 1934 † (FOSSIL)
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Ephippiorthoceras plicatuloides
E. Strand, 1934 † (FOSSIL)
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Genus: Gangshanoceras Zou, 1988 † (DB: 5 SP)
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Gangshanoceras densum
Zou, 1988 † (FOSSIL)
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Gangshanoceras guichinense
Ying, 1989 † (FOSSIL)
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Gangshanoceras jurongense
Zou, 1988 † (FOSSIL)
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Gangshanoceras villicumense
Kröger & al., 2007 † (FOSSIL)
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Gangshanoceras wennanense
Ying, 1989 † (FOSSIL)
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Genus: Gorbyoceras Shimizu & Obata, 1935 † (DB: 7 SP)
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Gorbyoceras alternestriatum
(E. Strand, 1934 †) (FOSSIL)
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Gorbyoceras clathroannulatum
(F.A. Roemer, 1861 †) (FOSSIL)
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Gorbyoceras gorbyi
(Miller, 1894 †) (FOSSIL)
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Gorbyoceras gracile
(Portlock, 1843 †) (FOSSIL)
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Orthoceras gracile Portlock, 1843 † =» Gorbyoceras gracile
(Portlock, 1843 †)
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Gorbyoceras hammelli
(Foerste, 1910 †) (FOSSIL)
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Spyroceras hammelli Foerste, 1910 † =» Gorbyoceras hammelli
(Foerste, 1910 †)
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Gorbyoceras tetreauense
Wilson, 1961 † (FOSSIL)
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Gorbyoceras textumaraneum
(F.A. Roemer, 1861 †) (FOSSIL)
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Genus: Isorthoceras Flower, 1962 † (DB: 12 SP)
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Isorthoceras albersi
(Miller & M.J. Faber, 1894 †) (FOSSIL)
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Geisonocerina elongatocinctum Portlock, 1843 † =» Isorthoceras albersi
(Miller & M.J. Faber, 1894 †)
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Isorthoceras angelini
Kröger, 2013 † (FOSSIL)
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Isorthoceras curvilineatum
Kröger, 2013 † (FOSSIL)
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Isorthoceras dalecarlense
Kröger & al., 2011 † (FOSSIL)
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Isorthoceras elongatocinctum
(Portlock, 1843 †) (FOSSIL)
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Geisonoceras heroyense E. Strand, 1934 † =» Isorthoceras elongatocinctum
(Portlock, 1843 †)
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Isorthoceras heroyense
(E. Strand, 1934 †) (FOSSIL)
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Orthoceras junceum J.W. Hall, 1847 † =» Isorthoceras heroyense
(E. Strand, 1934 †)
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Isorthoceras junceum
(I. Balashov, 1956 †) (FOSSIL)
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Orthoceras sociale J.W. Hall, 1877 † =» Isorthoceras junceum
(I. Balashov, 1956 †)
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Isorthoceras rogersensis
(Foerste, 1914 †) (FOSSIL)
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Treptoceras praenuntium Flower, 1942 † =» Isorthoceras rogersensis
(Foerste, 1914 †)
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Isorthoceras sociale
(J.W. Hall, 1877 †) (FOSSIL)
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Cyrtoceras sociale J.W. Hall, 1876 † =» Isorthoceras sociale
(J.W. Hall, 1877 †)
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Dolorthoceras sociale J.W. Hall, 1876 † =» Isorthoceras sociale
(J.W. Hall, 1877 †)
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Isorthoceras suave
(Angelin & Lindström, 1880 †) (FOSSIL)
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Isorthoceras subcostatum
(Portlock, 1843 †) (FOSSIL)
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Orthoceras subcostatus Portlock, 1843 † =» Isorthoceras subcostatum
(Portlock, 1843 †)
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Isorthoceras wahlenbergi
Niko, 2007 † (FOSSIL)
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Genus: Mesnaquaceras Flower, 1955 † (DB: 1 SP)
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Mesnaquaceras curviseptatum
Flower, 1955 † (FOSSIL)
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Genus: Monomuchites Wilson, 1961 † (DB: 3 SP)
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Monomuchites annularis
M.A. Frey, 1995 † (FOSSIL)
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Monomuchites costalis
Wilson, 1961 † (FOSSIL)
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Monomuchites obliquum
M.A. Frey, 1995 † (FOSSIL)
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Genus: Orthonybyoceras Shimizu & Obata, 1935 † (DB: 1 SP)
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Orthonybyoceras dyeri
(Miller, 1875 †) (FOSSIL)
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Orthonybyoceras covingtonense Foerste & Teichert, 1930 † =» Orthonybyoceras dyeri
(Miller, 1875 †)
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Genus: Palaeocycloceras Balashov, 1968 † (DB: 1 SP)
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Palaeocycloceras eichwaldi
I. Balashov, 1968 † (FOSSIL)
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Genus: Proteoceras Flower, 1955 † (DB: 4 SP)
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Proteoceras moniliforme
(J.W. Hall, 1847 †) (FOSSIL)
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Proteoceras perkinsi
(Ruedemann, 1906 †) (FOSSIL)
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Proteoceras pulchrum
Flower, 1955 † (FOSSIL)
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Proteoceras tyronensis
(Foerste, 1912 †) (FOSSIL)
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Sactoceras josephianum Foerste, 1933 † =» Proteoceras tyronensis
(Foerste, 1912 †)
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Orthoceras tyronensis Foerste, 1912 † =» Proteoceras tyronensis
(Foerste, 1912 †)
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Genus: Stereospyroceras Flower, 1955 † (DB: 2 SP)
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Stereospyroceras champlainense
Flower, 1955 † (FOSSIL)
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Stereospyroceras clintoni
(Miller, 1877 †) (FOSSIL)
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Spyroceras clintoni Miller, 1877 † =» Stereospyroceras clintoni
(Miller, 1877 †)
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Genus: Tofangoceras Kobayashi, 1927 † (DB: 2 SP)
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Tofangoceras irregulare
T. Kobayashi, 1928 † (FOSSIL)
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Tofangoceras pauciannulatum
T. Kobayashi, 1928 † (FOSSIL)
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Protocycloceras krivolukense Balaschov, 1962 † =» Tofangoceras pauciannulatum
T. Kobayashi, 1928 †
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Genus: Transorthoceras Kröger & al., 2011 † (DB: 1 SP)
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Transorthoceras osmundsbergense
Kröger & al., 2011 † (FOSSIL)
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Genus: Treptoceras Flower, 1942 † (DB: 5 SP)
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Treptoceras cincinnatiensis
(Miller, 1875 †) (FOSSIL)
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Treptoceras duseri
(J.W. Hall & R.P. Whitfield, 1875 †) (FOSSIL)
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Treptoceras fosteri
(Miller, 1875 †) (FOSSIL)
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Treptoceras transversum
(Miller, 1875 †) (FOSSIL)
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Orthoceras hindei M.J. James, 1878 † =» Treptoceras transversum
(Miller, 1875 †)
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Treptoceras yokoyamai
(Kobayashi, 1927 †) (FOSSIL)
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