Classification of Brattstrom 1955
G. Kinosternon von Spix 1824 [mud turtle]
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†Kinosternon arizonense Gilmore 1922 [Arizona mud turtle]
G. Coluber Linnaeus 1758 [racer]
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Coluber constrictor Linnaeus 1758 [black racer]
G. Crotalus Linnaeus 1758 [rattlesnake]
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Crotalus lepidus Kennicott 1861 [rock rattlesnake]