u/RulerK

Anuroctonus phaiodactylus, commonly known as the eastern swollen-stinger scorpion or mafia scorpion, is a burrowing scorpion species native to the western United States, including Utah, Nevada, Idaho, and desert regions of California.

It belongs to the family Anuroctonidae.

Physically, the species is easily recognized by its stocky, robust build and distinct two-toned coloration. Their bodies are typically a dull yellowish-brown, contrasting sharply with large, dark-tipped pincers (chelae).

The most definitive trait belongs to mature males, which develop a greatly enlarged, swollen segment (telson) just before the stinger. This bulbous modification is unique to the genus and is the origin of its common name.

Their life cycle and behavior revolve almost entirely around their subterranean homes. These scorpions construct deep, spiral-shaped burrows that can reach up to 60 centimeters (24 inches) below the surface to escape extreme desert temperatures.

As nocturnal predators, they rarely leave these tunnels entirely, preferring to wait patiently at the entrance to ambush passing insects, beetles, and small lizards.

Like many desert scorpions, Anuroctonus phaiodactylus possesses specialized molecules in its exoskeleton that cause it to fluoresce intensely under ultraviolet light. When exposed to a UV blacklight, their bodies glow a vivid, bright blue-green color.

While they do possess venom to subdue their prey, their sting is not considered medically significant to humans and generally results only in mild, localized pain similar to a bee sting.

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