1. Palaeoscience Research Center, School of Environmental and Rural Science, University of New England, Armidale 2351, NSW, Australia,
2. Dipartimento di Scienze della Terra e Geologico-Ambientali, Alma Mater Studiorum, Università di Bologna, via Zamboni 67, 40126 Bologna, Italy
3. Department of Biological Sciences, University of Alberta, Edmonton T6G 2E9, Alberta, Canada
4. Philip J. Currie Dinosaur Museum, Wembley T0H 3S0, Alberta, Canada
5. Cutbank Palaeontological Consulting, Grande Prairie T8W 0H6, Alberta, Canada
6. Department of Natural History, Royal Ontario Museum, Toronto M5S 2C6, Ontario, Canada