Utiger argued that North American Rat Snakes of the genus Elaphe are a monophyletic group and thus separate from Old World members of the genus. They therefore resurrected the available name Pantherophis Fitzinger for all North American taxa. In addition, they change the spelling for the specific name to obsoletus. Crother rejected the taxonomic change to pantherophis, preferring to retain the current concept of Elaphe.
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