1. Museu de Arqueologia e Paleontologia, Universidade Federal do Piauí, 64049-550 Teresina, Brazil
2. Paleontology Unit, North Carolina Museum of Natural Sciences, Raleigh, NC 27601, USA
3. Negaunee Integrative Research Center, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, IL 60605, USA
4. Institut für Biologie, Humboldt-Universität zu Berlin, Invalidenstr. 42, D – 10115 Berlin, Germany
5. Departamento de Cs. Geologicas, FCEN, Universidad de Buenos Aires, C1428EHA Ciudad Autónoma de Buenos Aires, Argentina
6. CONICET-UBA, Instituto de Estudios Andinos (IDEAN) Buenos Aires, Argentina
7. Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, 2050 Johannesburg, South Africa
8. Iziko South African Museum, PO Box 61, Cape Town, South Africa
9. Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK