The spider was out at night.
This is a very interesting critter, related to spiders, but not an actual spider. This is a Windscorpion (maybe Eremobates sp.?), which is an arachnid, like spiders, but related on the same scale, more or less, as spiders are to scorpions.
Interesting, sounds distinctly possible for the location. It would also explain the extra front looking legs. Thank you!