Pyenson Nicholas D, Parham James F, Velez-Juarbe Jorge
Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, PO Box 37012, Washington, DC 20013-7013, USA
John D. Cooper Archaeology and Paleontology Center, Department of Geological Sciences, California State University, Fullerton, CA 92834, USA.
Biol Lett. 2016 Feb;12(2):20150149. doi: 10.1098/rsbl.2015.0149.