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Bark Scorpion (Centruroides exilicauda)
bark scorpion

DESCRIPTION: body (not "tail") up to 2.75" long. Distinguished from other local scorpions by its long, thin pincers (when you're this toxic you don't need strong pincers).
NATURAL HISTORY: Most venomous local scorpion (potentially fatal -- when stung, call the
Arizona Poison and Drug Information Center at 626-6016 in Tucson and 1-800-362-0101 elsewhere in Arizona.). Often the most common scorpion found in and around houses in Tucson. Prefers resting/ambushing from head-down position and is often seen climbing or sitting high above the ground (unlike stripe-tailed and giant desert hairy scorpions). See also General natural history of scorpions and section on Venomous Animals.
Click on thumbnails below for more images:

bark scorpion close up bark scorpion ventral surface