Non-avian theropod dinosaurs with preserved integumentary coverings are bec
oming more common(1-6); but apart from the multiple specimens of Caudiptery
x, which have true feathers(2,7), animals that are reasonably complete and
entirely articulated that show these structures in relation to the body hav
e not been reported. Here we report on an enigmatic small theropod dinosaur
that is covered with filamentous feather-like structures over its entire b
ody.