1. Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.
2. Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK.
3. School of Biological Sciences, University of Adelaide, Adelaide, SA 5005, Australia.
4. South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.