 "Paravaejovis spinigerus" is a medium-sized scorpion with large adult males and females reaching nearly 60–70 mm, weighing approximately 9.5 g. It can be differentiated from the Arizona bark scorpion ("Centruroides sculpturatus") by the brownish-tan stripes on the back of its tail along the keels or ridges; the tail is typically thicker than the hands and pedipalps, both of which are quite slender in the bark scorpions.Some others may have a base color of light yellow/golden brown with variable underlying ducky markings along its tail.The name "spinigerus" is derived from the spiniform granules at the ends of the dorsal keels of the tail.