Juan D. Carrillo. Paläontologisches Institut und Museum, Universität Zürich. Karl-Schmid-Strasse 4, 8006 Zürich, Switzerland and Department of Zoology, University of Cambridge. Downing Street CB2 3EJ, Cambridge, UK. juan.carrillo@pim.uzh.ch

Juan Carrillo is a PhD student at the Paleontological Institute and Museum of the University of Zurich, Switzerland and SNF fellow at the Museum of Zoology in Cambridge, UK. His research includes the systematics and paleobiology of south american mammals (native ungulates and rodents)

Robert J. Asher. Department of Zoology, University of Cambridge. Downing Street CB2 3EJ, Cambridge, UK. r.asher@zoo.cam.ac.uk

Robert Asher is Senior Lecturer and Curator of Vertebrates at the Museum of Zoology in Cambridge, UK. His research interests include development and constraint among southern placental mammals (Afrotheria and Xenarthra), the evolution of endemic African mammals, and the diversification of therian mammals.