Godefroit `` et al. '' concluded that the filaments earlier reported in Ornithischia , with `` Psittacosaurus '' and `` Tianyulong '' , could be homologous to the `` protofeathers '' found in non-avian theropods .
The filaments earlier reported in Ornithischia , on `` Psittacosaurus '' and `` Tianyulong '' , could be homologous to the `` protofeathers '' found in non-avian theropods .