Uropygi
Uropygi is an order of arachnids commonly called whip scorpions or vinegaroons. They have a whip-like tail and can spray an acidic defensive fluid.
Flagellum (arachnid): A slender, whip-like sensory appendage at the rear of certain arachnids. Uropygi use this tail-like structure to explore their surroundings.
Arachnid: A member of the arthropod group that includes spiders, scorpions, mites, and harvestmen. Uropygi are arachnids, sharing their basic body plan and four pairs of walking legs.
Amblypygi: An arachnid order of tailless whip scorpions with elongated sensory front legs. Amblypygi share the common name’s whip imagery but lack Uropygi’s tail and acidic spray.
Nocturnality: An animal activity pattern in which most activity occurs at night. Vinegaroons typically forage after dark, avoiding daytime heat and exposure.
Mastigoproctus giganteus: A large North American vinegaroon found in the southwestern United States and Mexico. This well-known species illustrates the order’s robust body and long whip-like flagellum.
Pedipalp: A pair of appendages near an arachnid’s mouth, often adapted for sensing, feeding, or grasping. Vinegaroons use enlarged pedipalps to seize and crush prey.
Chelicerata: An arthropod subphylum including arachnids, horseshoe crabs, and sea spiders. Uropygi belong to this larger lineage, characterized by chelicerae rather than antennae.
Schizomida: A small arachnid order of short-tailed whip scorpions, generally much smaller than vinegaroons. Schizomids are close relatives with a reduced flagellum and no vinegaroon-style spray.
Burrowing: The creation or use of tunnels and chambers in soil or other substrates. Vinegaroons shelter in burrows and retreat there during the day.
Thelyphonida: A name used for the whip-scorpion order containing vinegaroons, often treated as a synonym of Uropygi. Taxonomic references may use this order name for the same animals.