Classification of Parmley and Holman 1995

Fm. Boidae Gray 1825 [boa]
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Subfm. Erycinae Bonaparte 1825 [sand boa]
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G. Charina Gray 1849
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Charina bottae Blainville 1835 [northern rubber boa]
†Charina prebottae Brattstrom 1958
G. Lichanura Cope 1861
Fm. Colubridae Oppel 1811 [colubrid snake]
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Subfm. Colubrinae Oppel 1811
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G. Arizona Kennicott 1859
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Arizona elegans Kennicott 1859 [glossy snake]
†Arizona voorhiesi Parmley and Holman 1995
G. Coluber Linnaeus 1758 [racer]
G. Elaphe Wagler 1833
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Elaphe guttata Linnaeus 1766 [corn snake]
†Elaphe nebraskensis Holman 1964
Elaphe obsoleta Say 1823 [black rat snake]
G. Lampropeltis Fitzinger 1843
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Lampropeltis calligaster Harlan 1827 [prairie kingsnake]
Lampropeltis getulus Linnaeus 1766 [kingsnake]
Lampropeltis triangulum Lacépède 1788 [milk snake]
G. Masticophis Baird and Girard 1853 [whip snake]
G. †Nebraskophis Holman 1973
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†Nebraskophis skinneri Holman 1973
G. †Paracoluber Holman 1970
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†Paracoluber storeri Holman 1970
G. Pituophis Holbrook 1842 [gopher snake]
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Pituophis melanoleucus Daudin 1803 [pine snake]
G. Salvadora Baird and Girard 1853
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†Salvadora paleolineata Holman 1973
Subfm. Natricinae Bonaparte 1838
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G. †Neonatrix Holman 1973
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†Neonatrix elongata Holman 1973
†Neonatrix magna Holman 1982
G. Nerodia Baird and Girard 1853 [water snake]
G. Thamnophis Fitzinger 1843 [garter snake]
Subfm. Xenodontinae Bonaparte 1845
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G. Heterodon Latreille 1801 [hog-nosed snake]
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Heterodon nasicus Baird and Girard 1852 [western hognose snake]
Heterodon platyrhinos Latreille 1801 [eastern hognosed snake]
†Heterodon plionasicus Peters 1953
Heterodon simus Linnaeus 1766 [southern hognose snake]
G. †Paleoheterodon Holman 1964
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†Paleoheterodon tiheni Holman 1964
Fm. Viperidae Oppel 1811 [viper]
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G. †Agkistrodon Huxley 1865 [cottonmouth]
G. Crotalus Linnaeus 1758 [rattlesnake]
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Crotalus horridus Linnaeus 1758 [timber rattlesnake]