Not feathers or feather-like structures:
Hadrosaur frills:
Horner, JR.(1984) A "segmented" epidermal tail frill in a species of hadrosaurian dinosaur. Journal of Paleontology. 58, 270-271.
Osborn, H.F.(1912) "Integument of the iguanodont dinosaur Trachodon", Memoirs of the AMNH ; new ser., v. 1, pt. 1-2.
http://digitallibrary.amnh.org/handle/2246/49
Hadrosaur comb:
Bell PR, Fanti F, Currie PJ, Arbour VM.(2014) A mummified duck-billed dinosaur with a soft-tissue cock's comb. Current Biology. 24: 70-75.
On February 20, 2021 at 12:58 PM John Schneiderman <john-schneiderman@cox.net> wrote:
It seems that I read somewhere of a large ceratopsian and a large hadrosaur (Edmontosaurus or Parasaurolophus) with filamentous integument on he tail or running down the back. The large ceratopsian may have been a speculative based on the Psittacosaur sp. Check also the hypsilophodontids of southern-most Australia.
The three you have listed is about the most comprehensive list of "feathered" ornithischians, I know of.
On February 18, 2021 at 6:27 AM Poekilopleuron <dinosaurtom2015@seznam.cz> wrote:
Good day,
I would like to ask, if there is any comprehensive list of all known "feathered" ornithischian dinosaur specimens. That includes those with a "primitive" filamentous integument as in Psittacosaurus sp. from Yixian. Is it still just Kulindadromaeus, Tianyulong and Psittacosaurus so far? Thank you, in advance! Tom