Classification of Williams 1985

Cl. Chondrichthyes Huxley 1880 [cartilaginous fish]
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Subcl. Elasmobranchii Bonaparte 1838 [elasmobranch]
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Or. †Symmoriida Zangerl 1981
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Fm. †Symmoriidae Dean 1909
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G. †Danaea Pruvost 1922
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†Danaea meccaensis Williams 1985
G. †Symmorium Cope 1893
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†Symmorium reniforme Cope 1893
Or. †Coronodontida Zangerl 1981
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Fm. †Coronodontidae Harris 1951
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G. †Diademodus Harris 1951
Superfm. †Ctenacanthoidea Zangerl 1981
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Fm. †Phoebodontidae Williams 1985
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G. †Phoebodus St. John and Worthen 1875
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†Phoebodus heslerorum Williams 1985
G. †Rhombacanthus Williams 1985
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†Rhombacanthus zangerli Williams 1985
Fm. †Stethacanthidae Lund 1974
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G. †Stethacanthus Newberry 1889
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†Stethacanthus altonensis St. John and Worthen 1875