A near complete and articulated parvicursorine pes, referred to Linhenykus, is described. This is one of the first foot skeletons to be described for a derived alvarezsaur and provides new information on the first digit of the pes. The evolution of a laterally directed flange of the anterior face of the distal third metatarsal in arctometatarsalian taxa is discussed.

Key words: Theropod, maniraptoran, arctometatarsal, Late Cretaceous, Inner Mongolia.

David W.E. Hone [dwe_hone@yahoo.com] School of Biology & Environmental Sciences, University College Dublin, Dublin 4, Ireland and Institute of Vertebrate Palaeontology and Palaeoanthropology, 10044 Beijing, China; Jonah N. Choiniere [jchoiniere@amnh.org] American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, USA; Qingwei Tan [firsttan@sina.com] Long Hao Institute of Geology and Paleontology, Hohhot, Inner Mongolia, 010010,China; Xu Xing [xu.xing@ivpp.ac.cn] Key Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology & Paleoanthropology, 10044 Beijing, China.