Classification of Maisey 1982
G. †Sphenacanthus Agassiz 1837
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†Sphenacanthus aequistriatus Davis 1879
†Sphenacanthus costellatus Traquair 1884
†Sphenacanthus marshi Newberry 1873
†Sphenacanthus serrulatus Agassiz 1837
Fm. †Ctenacanthidae Dean 1909
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G. †Bythiacanthus StJohn and Worthen 1875
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†Bythiacanthus brevis Agassiz 1836
†Bythiacanthus ianishevskyi Khabakob 1926
†Bythiacanthus lucasi Eastman 1902
†Bythiacanthus siderius Leidy 1870
†Bythiacanthus solidus Eastman 1903
†Bythiacanthus vanhornei StJohn and Worthen 1875
G. †Glymmatacanthus StJohn and Worhten 1875
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†Glymmatacanthus irishii StJohn et al. 1883
†Glymmatacanthus petrodoides StJohn et al. 1883
†Glymmatacanthus rudis StJohn et al. 1883