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Haplocheirus
Haplocheirus is a genus of alvarezsauroid theropod dinosaur. It is the most basal member of its clade.[1] It is the oldest known alvarezsauroid, predating all other members by about 63 million years. This also makes it about 15 million years older than Archaeopteryx. Haplocheirus was described in 2010 from a fossil specimen found from the 160-million-year-old Shishugou Formation in the Junggar Basin of northwestern China. The type species is H. sollers, meaning "simple-handed skillful one", referencing its hypothesized behavior of using its three-fingered hands for activities other alvarezsauroids couldn't, such as catching prey.

Description

Haplocheirus was the largest known definite alvarezsauroid, at around 2 meters long. It had an enlarged thumb claw like other alvarezsauroids, but also retained two other functional fingers, unlike more derived alvarezsauroids, where only the thumb was significantly large and clawed. It had long legs and was probably a fast runner.

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