Assertion: feather's structure | /r/HasProperty | reported
Facets:
value: clearly
type: MANNER
value: in specimens of the ornithischian dinosaurs
type: LOCATION
Source sentences:
text: Filamentous structures are clearly present in pterosaurs, and long, hollow quills have been reported in specimens of the ornithischian dinosaurs Psittacosaurus and Tianyulong.