Mastigoproctus

Mastigoproctus is a genus of arachnids in the order Uropygi, commonly known as whip scorpions or vinegaroons. Members of this genus are found in the Americas, with Mastigoproctus giganteus as the best-known species. Its range extends from the southern United States through parts of Mexico and Central America. Species in the genus are typically medium to large, with a flattened body, robust pedipalps for grasping prey, and a long, flexible tail (telson) that resembles a whip and is used primarily for sensory input rather than stinging.

Whip scorpions lack a functional stinger and are not considered dangerous to humans; when threatened they can spray a vinegar-like liquid containing acetic acid from specialized abdominal glands.

Mastigoproctus species inhabit humid microhabitats such as leaf litter, under logs and rocks, and sometimes human-modified environments. They are nocturnal predators and scavengers, feeding on insects, spiders, snails, and other small invertebrates.

Reproduction involves sexual mating in which males transfer a spermatophore that the female takes up. The eggs hatch into nymphs that molt through several instars before reaching adulthood.

The genus comprises multiple species distributed in the Americas, though most public attention focuses on M. giganteus, the giant whip scorpion. Conservation status is generally not a major concern, though local populations can be affected by habitat loss and pesticide use.