ACKNOWLEDGMENTS
We thank N. Gonzalez, A. Moretti, G. González, J. Ochoa, M. Ripoll, M. Soto, R. Zapata, and C. Albornoz for their contributions to the excavation and preparation of the specimen. J. Ochoa is thanked for finding the specimen and for his detailed drawings of Figure 3. L. Salgado, A. Garrido, and J. Wilson are thanked for their useful comments in early drafts of the manuscript. We want to specially thank the fruitful comments and the patience of the JVP editor, J. Wilson. Reviewers P. Mannion, J. Whitlock, P. Gallina, and an anonymous reviewer improved the manuscript with constructive comments. We also thank J. Calvo and C. Muñoz for permitting us the access to the specimens under their care. The Municipality of Villa El Chocón is thanked for its support. Finally, we want to acknowledge L. Hernández (Hidroar S.A.) for the logistic and photographic help.
Handling editor: Jeffrey Wilson