Classification of Heidtke 1998

Cl. Chondrichthyes Huxley 1880 [cartilaginous fish]
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Subcl. Elasmobranchii Bonaparte 1838 [elasmobranch]
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Or. †Xenacanthida Glikmann 1964
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Fm. †Orthacanthidae Heyler and Poplin 1989
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G. †Orthacanthus Agassiz 1843