Named By: Xu Xing - 2011.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Theropoda, Alvarezsauroidea, Alvarezsauridae, Parvicursorinae.
Species: L. monodactylus (type).
Size: Estimated around 90 centimetres long.
Known locations: Mongolia, Bayan Mandahu Formation (Wulansuhai Formation).
Time period: Campanian of the Cretaceous.
Fossil representation: Partial skeleton including pelvis, legs, fore limb and vertebrae.
has the distinctive feature of incredibly reduced arms that are typical
of the alvarezsauroids.
What makes Lynhenykus stand
out from the group
though is the fact that it had only one finger. A bone for a second
finger was discovered but the nub is not thought to have been
Although at first glance the reduced forelimbs seem to be of no value, they were probably the key adaptations for the survival of Linhenykus. It is thought that the finger would have been used it to dig into termite nests. The finger however was not as well developed as others that have been found in earlier alvarezsaurs, suggesting that the evolution of this finger may have reversed to a more primitive form.
- A monodactyl nonavian dinosaur and the complex evolution of the alvarezsauroid hand. - Proceedings of the National Academy of Sciences 108 (6): 2338–2342. - Xing Xu, Corwin Sullivan, Michael Pittman, Jonah N. Choiniere, David Hone, Paul Upchurch, Qingwei Tan, Dong Xiao, Lin Tan & Fenglu Han - 2011.