Which subspecies listed by the Reptile Database within *Crotopus oreganus* is also debated regarding its classification relative to *C. viridis*?
Answer
C. o. viridis
The subspecies organization of *Crotalus oreganus* reflects the ongoing taxonomic fluidity, particularly concerning its relationship with *Crotalus viridis*. The Reptile Database lists *C. o. viridis* as a recognized subspecies within *C. oreganus*. However, the text explicitly notes that historical and ongoing revisions sometimes suggest placing *C. o. viridis* separately as a distinct species or that older classifications treated it separately. This placement is unstable across different systematic authorities, contrasting with the nominate subspecies *C. o. oreganus* which is generally accepted as the form prevalent in the northwestern range.
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