Classification of Parmley and Holman 2007

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]