Uropygid
| Whip scorpions, vinegaroons | |
|---|---|
 |
|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Class: | Arachnida |
| Order: |
Thelyphonida O. P-Cambridge, 1872 |
| Families | |
| Diversity | |
| c. 15 genera, > 100 species | |
Thelyphonida is an arachnid order comprising invertebrates commonly known as whip scorpions or vinegaroons (also spelled vinegarroons and vinegarones). They are often called uropygids in the scientific community based on an alternative name for the order, Uropygi (which may then also include the order Schizomida). The name "whip scorpion" refers to their resemblance to true scorpions and possession of a whiplike tail. "Vinegaroon" is based on their ability when attacked to discharge an offensive liquid which contains acetic acid, producing a vinegar-like smell.
Carl Linnaeus first described a whip scorpion in 1758, although he did not distinguish it from what are now regarded as different kinds of arachnid, calling it Phalangium caudatum. Phalangium is now used as a name for a genus of harvestmen (Opiliones). In 1802, Pierre André Latreille was the first to use a genus name solely for whip scorpions, namely Thelyphonus. Latreille later explained the name as meaning "qui tue", meaning "who kills". One name for the order, Thelyphonida, is based on Latreille's genus name. It was first used (with the spelling Thelyphonidea) by O. P. Cambridge in 1872.
The name "uropygid" means "tail rump", from Ancient Greek οὐροπύγιον (ouropugion), from οὐρά (oura) "tail" and πυγή (puge) "rump" referring to the whip-like flagellum on the end of the pygidium, a small plate made up of the last three segments of the abdominal exoskeleton.
The classification and scientific name used for whip scorpions varies. Originally, Amblypygi (whip spiders), Thelyphonida and Schizomida (short-tailed whipscorpions) formed a single order of arachnids, Pedipalpi. Pedipalpi was later divided into two orders, Amblypygi and Uropygi (or Uropygida). Schizomida was then split off from Uropygi into a separate order. The remainder has either continued to be called by the same name, Uropygi, possibly distinguished as Uropygi sensu stricto, or called Thelyphonida. Other sources do not accept the split, and continue to treat Schizomida as part of Uropygi. Phylogenetic studies show the three orders to be closely related, and the older order names may now be used as names for clades, as shown below.
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