What arachnid order is also known as tailless whip scorpions?

The arachnid order known as tailless whip scorpions is Amblypygi. Members of this order are also called whip spiders because their first pair of legs are extremely long, flexible sensory feelers that resemble whips.

Despite the common name, amblypygids are neither true scorpions nor spiders. They are arachnids, and their order name means “blunt tail,” referring to the absence of the whip-like tail found in true whip scorpions. Amblypygids have flattened bodies, large spiny pedipalps for seizing prey, and eight legs, although they normally walk on six and use the front pair for sensing.

They are mainly nocturnal and live in tropical or subtropical environments, including caves, tree trunks, leaf litter, and rock crevices. Their sideways, crab-like walking style is another feature that often surprises observers. Although their appearance is intimidating, amblypygids lack venom glands and are generally harmless to humans.

The most important naming trap is Uropygi. Uropygi contains the true whip scorpions, sometimes called vinegaroons, which do have a tail-like flagellum and can release an acetic-acid-like defensive spray. Ricinulei and Palpigradi are also arachnid orders, but neither is known as the tailless whip scorpion group.