TL;DR: The holotype of Loncosaurus argentinus is removed from Theropoda and placed within Ornithopoda, due to the presence of a pendant fourth trochanters and trochanteric fossae.
Abstract: The holotype of Loncosaurus argentinus is removed from Theropoda and placed within Ornithopoda, due to the presence of a pendant fourth trochanter and trochanteric fossae The taxon Loncosaurus argentinus is here considered a nomen vanum because of the absence of diagnostic characters Among the Ornithopoda, no synapomorphies shared with the Ankylopollexia (higher iguanodontians + hadrosaurids) were observed