Classification of Heckert 2004
Cl. Mammalia Linnaeus 1758 [mammal]
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Fm. Sphenodontidae Cope 1871
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Or. †Ornithischia Seeley 1888 [ornithischian]
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Subcl. Elasmobranchii Bonaparte 1838 [elasmobranch]
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Or. †Xenacanthiformes Berg 1955
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Superor. Euselachii Hay 1902
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Superfm. †Hybodontoidea Agassiz 1834
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Fm. †Hybodontidae Agassiz 1834
Cl. Actinopterygii Cope 1887 [ray-finned fish]
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Unr. Halecostomi Regan 1903
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Or. †Redfieldiformes Berg 1955
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Unr. Sarcopterygii Romer 1955 [lobe-finned fish]
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Subcl. Dipnoi Müller 1884 [lungfish]
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