Which subspecies is associated with Great Basin transition zones east of the Sierra Nevada?
Answer
*C. o. lutosus*
The *C. o. lutosus*, known as the Great Basin Rattlesnake, occupies the eastern territory within California, specifically inhabiting areas near the crest of the Sierra Nevada mountains. This geographical separation places it distinctly in the Great Basin transition zones, with counties such as Mono and Inyo being noted examples of its habitat. This distribution contrasts sharply with *C. o. oreganus*, which dominates the western side, and *C. o. helleri*, which is found in the southern coastal areas, although boundaries between these forms can sometimes lead to taxonomic uncertainty and intergrade zones.
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