"LONCOSAURUS ARGENTINUS" AMEGHINO, 1899 (ORNITHISCHIA, ORNITHOPODA): A REVISED DESCRIPTION WITH COMMENTS ON ITS PHYLOGENETIC RELATIONSHIPS

Rodolfo A. Coria, Leonardo Salgado

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.

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