The first occurrence of a probable pachycephalosaurian hyoid element 1Phillip and Patricia Frost Museum of Science, Miami, FL, United States 2Museum of the Rockies, Bozeman, Montana, United States 3American Museum of Natural History, New York, New York, United States 4Department of Anatomy and Cell Biology, Oklahoma State University, Tulsa, OK, United States 5The Children’s Museum of Indianapolis, Indianapolis, IN, United States DOI 10.7717/peerj.21719 Academic Editor Paula Bona Subject Areas...