Thelyphonida is an arachnid order comprising invertebrates commonly known as vinegaroons (or vinegarroons). They are often called uropygids in the scientific community after the former order Uropygi (which originally also included the order Schizomida). They are also known as whip scorpions because of their resemblance to true scorpions and because of their whiplike tails.
Vinegarroons are carnivorous, nocturnal hunters feeding mostly on insects and millipedes, but sometimes on worms and slugs. Mastigoproctus sometimes preys on small vertebrates. The prey is crushed between special teeth on the inside of the trochanters (the second segment of the leg) of the front legs. They are valuable in controlling the population of roaches and crickets.
Vinegarroons are found in tropical and subtropical and Hot Dry areas worldwide. They are missing in Europe, Australia, and, except for an introduced species, in Africa. They usually dig underground burrows with their pedipalps, to which they transport their prey. They may also burrow under logs, rotting wood, rocks, and other natural debris. They prefer humid, dark places and avoid light.