Best of 2013 - symbiote
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Fluorescent scorpion

Fluorescent scorpion

A scorpion fluorescing under illumination by 375 nm UV LED light with Schott UG1 to attenuate the violet long-wavelength tail of the LED spectrum. I think this one is a NW Forest Scorpion (Uroctonus mordax), but it might be a CA Common Scorpion (Paruroctonus silvestri). San Francisco Peninsula.