Classification of Holman 2000

Fm. Boidae Gray 1825 [boa]
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Subfm. Tropidopheinae Cope 1894
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G. †Dunnophis Hecht 1959
Subfm. Colubrinae Oppel 1811
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G. †Ameiseophis Holman 1976
G. †Texasophis Holman 1977
Subfm. Crotalinae Oppel 1811 [pit viper]
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G. Crotalus Linnaeus 1758 [rattlesnake]
Subfm. Erycinae Bonaparte 1825 [sand boa]
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G. †Geringophis Holman 1976
G. †Helagras Cope 1883
G. †Huberophis Holman 1977
G. Lichanura Cope 1861
G. †Ogmophis Cope 1844
G. †Pterygoboa Holman 1976
G. †Tregophis Holman 1975
Alethinophidia Nopcsa 1923
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G. †Tuscahomaophis Holman and Case 1992