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First evidence of an ankylosaur (dinosauria, ornithischia) in south america

1996; Asociación Paleontológica Argentina; Volume: 33; Issue: 4 Linguagem: Inglês

1851-8044

Rodolfo A. Coria, Leonardo Salgado,

Paleontology and Evolutionary Biology

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.