Mononykus

Mononykus ( , sometimes ; meaning "one claw") is a genus of alvarezsaurid dinosaur that lived during the Late Cretaceous in what is now Mongolia, specifically the Nemegt Formation. Mononykus was a very small theropod, estimated around in length with a weight of . As in Shuvuuia, Mononykus likely developed a shaggy feathering. It was lightly built with long, thin legs and highly reduced and specialized forelimbs that were likely used for foraging termite mounds or other insect colonies.

==History of discovery== thumb|left|Mounted holotype at the Giga Dinosaur Exhibition 2017, [[Japan]] Mononykus is represented by a single holotype specimen, catalog number MPC-D 107/6 (formerly IGM 107/6). It was collected in 1987 from the Bügiin Tsav locality of the Nemegt Formation, Gobi Desert. This specimen consists of a partial skeleton lacking a tail, and only small fragments of skull bones, including a complete braincase. Mononykus was originally named Mononychus in 1993, but later that year, it was renamed because the original name had already been used for a beetle named by Johann Schueppel, a German entomologist. Several other specimens were later misclassified as Mononykus, including specimens with partial tails (initially misinterpreted as being very short, though later specimens showed they were long and thin) and complete skulls showing a distinct, mostly toothless form. However, these specimens have since been reclassified in the new genus Shuvuuia. Because of this, many reconstructions of Mononykus in art and mounted skeletons in museums are in fact based mainly on Shuvuuia.