Classification of Smith 2013

Unr. Serpentes Linnaeus 1758 [snake]
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Unr. Alethinophidia Nopcsa 1923
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Superfm. Booidea Gray 1825
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Fm. Boidae Gray 1825 [boa]
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Subfm. Ungaliophiinae McDowell 1987 [dwarf boa]
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G. †Calamagras Cope 1873
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Calamagras weigeli Holman 1972
G. Exiliboa Bogert 1968
G. Ungaliophis Müller 1882
Fm. Loxocemidae Cope 1861 [Mexican burrowing snake]
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G. †Ogmophis Cope 1844
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Ogmophis compactus Lambe 1908
Superfm. Colubroidea Oppel 1811
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Fm. Colubridae Oppel 1811 [colubrid snake]
G. †Coniophis Marsh 1892