it appears to be an adult female. Aptostichus is a genus of sand trapdoor spiders in the wafer-lid trapdoor family (Euctenizidae)
It was probably trying to escape excessive humidity in her burrow following the severe thunderstorm that dumped a few inches of rain a few days before.
unfortunately, the only species listed for the immediate area were all known only from males.
there actually may be a chance this is the presumed extinct species A. lucerne, which would transform that species into a lazarus taxon. A. lucerne is a species known from an area very close to Sawtooth canyon, which may very well be males that simply wandered unusually far from their true population!
It's definitely not chemehuevi, sarlacc, or elisabethae. the only other possibility i can think of is hesperus, however that's not a desert species, and is found in chaparral or mountains. Atomarius is definitely out of the question, which is found in coastal scrubland and chaparral.
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