Which synonym reflects the original description designation placing the snake under Coluber?
Answer
Coluber obsoletus
The taxonomic history of the Western Rat Snake shows that its classification evolved significantly over time, resulting in several recognized synonyms listed in databases like the Reptile Database. The designation *Coluber obsoletus* is specifically identified as the original description designation. This early classification placed the species into the genus *Coluber*, which is historically associated with whip snakes. This initial placement reflects the understanding of morphology available at the time of the first scientific description, long before molecular data prompted the reorganization into the modern *Pantherophis* genus.

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