Classification of Duffin and Ginter 2006
G. †Stethacanthus Newberry 1889
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Invalid names: Cladodus hibberti Agassiz 1843 [nomen dubium]
Or. †Ctenacanthiformes Cappetta 1988
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Fm. †Ctenacanthidae Dean 1909
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G. †Cladodus Agassiz 1843
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†Cladodus bellifer St John and Worthen 1875
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Invalid names: Cladodus praenuntius St John and Worthen 1875 [synonym]
†Cladodus elegans Newberry and Worthen 1870
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Invalid names: Cladodus intercostatus St John and Worthen 1875 [synonym], Cladodus mucronatus Davis 1883 [synonym]
†Cladodus marginatus Agassiz 1843
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Invalid names: Cladodus acutus Agassiz 1843 [synonym], Cladodus laevis M'Coy 1848 [synonym]
†Cladodus mirabilis Agassiz 1843
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Invalid names: Cladodus basalis Davis 1883 [synonym], Cladodus splendens Newberry 1897 [synonym]
†Cladodus vanhornei St John and Worthen 1875
Invalid names: Cladodus conicus Agassiz 1843 [nomen dubium], Cladodus curvus Davis 1883 [nomen dubium], Cladodus milleri Agassiz 1843 [nomen dubium], Cladodus parvus Agassiz 1843 [nomen dubium]
G. †Ctenacanthus Agassiz 1836
G. †Saivodus Duffin and Ginter 2006
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†Saivodus striatus Agassiz 1843
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Invalid names: Cladodus corrugatus Croneis 1927 [synonym], Cladodus curtus Davis 1883 [synonym], Cladodus eccentricus St John and Worthen 1875 [synonym], Cladodus elongatus Davis 1883 [synonym], Cladodus ferox Newberry and Worthen 1866 [synonym], Cladodus grandis Newberry and Worthen 1866 [synonym], Cladodus hornei Davis 1883 [synonym], Cladodus magnificus Tuomey 1858 [synonym], Cladodus prototypus Eastman 1907 [synonym], Cladodus spinosus Newberry and Worthen 1866 [synonym], Cladodus stenopus Newberry and Worthen 1866 [synonym]
G. †Tamiobatis Eastman 1897