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ACKNOWLEDGMENTS
We thank A. Haluza, G. Lio, and J. I. Canale for their comments and observations regarding pterosaur anatomy and phylogeny. We appreciate the comments and suggestions provided by two anonymous reviewers that improved the overall quality of the manuscript. We thank R. Butler for his comments on the manuscript and improvement of the grammar. In particular, one of the reviewers suggested that the snout of Volgadraco might correspond a partial rostrum rather than a dentary symphysis as previously suggested. M. Moser (BSPG) allowed us to study pterosaur specimens under his care. We thank M. Sosa for his help and improvement of . F.E.N. thanks Conicet and Agencia Nacional de Promoción Cientifica y Técnica (grant ANPCyT PICT 2010-066) for financial support. M.K. is supported by a Linnaeus Framework Grant (2007-8731) from the Swedish Research Council, awarded to P.E.A.; this grant also financed the expedition during which the material was collected. M.D.E. was supported during part of this research by Ph.D. funding from the Emmy Noether Programme of the DFG (grant BU 2587/3-1 to Richard Butler).
Handling editor: You Hailu