Skeletal remains show how duck-billed dinosaurs evolved
“Superducks” once roamed the Montana landscape. Montana State University paleontologists Elizabeth Freedman Fowler and Jack Horner described the large duck-billed dinosaurs with strangely tiny nasal crests November 11 in PLOS ONE.
Unearthed in 2007, Probrachylophosaurus bergei’s most notable feature is a small, triangular crest that runs from the snout up to the forehead. Its bones resemble a hybrid of earlier noncrested dinosaurs with flat snouts, Acristavus, and their crested descendants, Brachylophosaurus, which sported a more pronounced profile.
Fowler and Horner say the new species lived between 79.8 million and 79.5 million years ago — between the heydays of the other two groups. In fact, the researchers argue, P. bergei is a missing link between duck-billed dinosaurs with and without crests.