Thelyphonida or whip scorpions and vinegaroons have a body no longer than 30 mm and very large scorpion-like pedipalps (commonly shortened to palps or palpi) or pincers.
Thelyphonida is an arachnid order comprising invertebrates commonly known as whip scorpions or vinegaroons (also spelled vinegarroons and vinegarones). Whip scorpions range from 25 to 85 mm (1.0 to 3.3 in) in length, with most species having a body no longer than 30 mm (1.2 in); the largest species, of the genus Mastigoproctus, can reach 85 mm (3.3 in). All species also have very large scorpion-like pedipalps (pincers) but there is an additional large spine on each palpal tibia. Pedipalps (commonly shortened to palps or palpi) are the second pair of appendages of chelicerates  a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. 
