Classification of Parmley and Hunter 2010

Fm. Boidae Gray 1825 [boa]
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Subfm. Erycinae Bonaparte 1825 [sand boa]
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G. †Calamagras Cope 1873
G. †Ogmophis Cope 1844
G. †Tregophis Holman 1975
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†Tregophis brevirachis Holman 1975
Fm. Colubridae Oppel 1811 [colubrid snake]
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Subfm. Colubrinae Oppel 1811
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G. †Ameiseophis Holman 1976
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†Ameiseophis robinsoni Holman 1976
G. Coluber Linnaeus 1758 [racer]
G. Elaphe Wagler 1833
G. Lampropeltis Fitzinger 1843
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Lampropeltis getula Linnaeus 1766 [kingsnake]
†Lampropeltis similis Holman 1964
Lampropeltis triangulum Lacépède 1788 [milk snake]
G. Liochlorophis Oldham and Smith 1991
G. Masticophis Baird and Girard 1853 [whip snake]
G. Opheodrys Fitzinger 1843
G. †Paracoluber Holman 1970
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†Paracoluber storeri Holman 1970
G. Pituophis Holbrook 1842 [gopher snake]
G. †Texasophis Holman 1977
Subfm. Natricinae Bonaparte 1838
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G. †Micronatrix Parmley and Hunter 2010
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†Micronatrix juliescottae Parmley and Hunter 2010
G. †Neonatrix Holman 1973
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†Neonatrix infera Holman 1996
G. Nerodia Baird and Girard 1853 [water snake]
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†Nerodia hillmani Wilson 1968
G. Thamnophis Fitzinger 1843 [garter snake]
G. Tropidoclonion Cope 1860
Subfm. Xenodontinae Bonaparte 1845
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G. Heterodon Latreille 1801 [hog-nosed snake]
G. †Paleoheterodon Holman 1964
Fm. Viperidae Oppel 1811 [viper]
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Subfm. Crotalinae Oppel 1811 [pit viper]
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G. †Agkistrodon Huxley 1865 [cottonmouth]
G. Crotalus Linnaeus 1758 [rattlesnake]
G. Sistrurus Garman 1883 [pigmy rattlesnake]