1. Department of Biological Sciences Purdue University Fort Wayne Indiana USA
2. Department of Mathematical Sciences Purdue University Fort Wayne Fort Wayne Indiana USA
3. Department of Biological Sciences University of Alberta Edmonton Alberta Canada
4. Utah Field House of Natural History State Park Vernal Utah USA
5. Beaty Centre for Species Discovery and Palaeobiology Section Canadian Museum of Nature Ottawa Ontario Canada
6. Department of Earth Sciences Carleton University Ottawa Ontario Canada
7. Royal Tyrrell Museum of Paleontology Alberta Canada