Classification of Williams 1998

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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Superfm. †Ctenacanthoidea Zangerl 1981
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Invalid names: Tamiobatidae Hay 1902 [empty]