An Early Cretaceous heterodontosaurid dinosaur with filamentous integumentary structures.

All the dinosaurs with feathers or similar integumentary structures have been theropods, and such feathery appurtenances have been absent among the distantly related ornithischian dinosaurs, with the possible exception of Psittacosaurus. In this paper the authors describe an ornithischian, belonging to a group of primitive ornithischian dinosaurs called heterodontosaurs, that has an all-over covering of feather-like structures, much more like those seen in theropods.