Classification of Williams 2001

Cl. Chondrichthyes Huxley 1880 [cartilaginous fish]
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Subcl. Elasmobranchii Bonaparte 1838 [elasmobranch]
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Or. †Cladoselachida Dean 1909
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Fm. †Cladoselachidae Dean 1894
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G. †Cladoselache Dean 1894
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†Cladoselache clarki Claypole 1893
Or. Euselachii Hay 1902
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Superfm. †Ctenacanthoidea Zangerl 1981
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Fm. †Ctenacanthidae Dean 1909
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G. †Ctenacanthus Agassiz 1836
†Ctenacanthus compressus Newberry 1889
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Invalid names: Ctenacanthus clarki Newberry 1889 [synonym]