The interrelationships and evolution of basal theropod dinosaurs Author Rauhut, Oliver W. M. text Special papers in palaeontology 2003 2003-05-31 69 1 213 journal article 10.5281/zenodo.3382576 48817a66-49e4-4e6f-b6c6-879db64b9ec9 3382576 Caudipteryx zoui Ji, Currie, Norell and Ji, 1998 Age . Barremian. Occurrence. Jiulongsong Member of the Chaomidianzi Formation, Liaoning, China. Diagnosis. Elongate, hooked premaxillary teeth; teeth only present in the premaxilla. Remarks. Caudipteryx is one of the most important theropod dinosaurs to be described recently ( Ji et al. 1998 ). It is especially noteworthy for the preserved feathers along its arms and at the tip of the tail, since the animal clearly represents a non-avian theropod. Together with the filaments in Sinosauropteryx , Beipiaosaurus , and Sinornithosaurus , and the feathers in Protarchaeopteryx , Caudipteryx provides clear evidence for the presence of feathers in non-avian coelurosaurs and thus greatly strengthens the arguments for the theropod origin of birds.