1. Division of Paleontology (Invertebrates), American Museum of Natural History, New York; and Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale, Australia.
2. Palaeontology Department, Australian Museum Research Institute, Sydney, New South Wales, Australia; and Department of Biological Sciences, Macquarie University, Sydney, New South Wales, Australia.
3. Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, Bloomington, Indiana.