Classification of Cione and Reguero 1994

Or. Lamniformes Berg 1958 [mackerel shark]
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Fm. Lamnidae Müller and Henle 1838 [mackerel shark]
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G. Isurus Rafinesque 1810
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†Isurus praecursor Thurmond and Jones 1981
Subcl. Elasmobranchii Bonaparte 1838 [elasmobranch]
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Or. Hexanchiformes de Buen 1926
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Fm. Hexanchidae Gray 1851 [cow shark]
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G. Hexanchus Rafinesque 1810 [sixgill shark]