1. Department of Earth Sciences, 2125 Herzberg Building, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada.
2. Department of Natural History, Royal Ontario Museum, 100 Queen’s Park, Toronto, ON M5S 2C6, Canada.
3. Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada.
4. Palaeobiology, Canadian Museum of Nature, P.O. Box 3443, Station “D”, Ottawa, ON P.O. Box 3443, Canada.