| Synonymous name | : | †Protiguanodon mongoliense Osborn, 1923 | |
Ref: PBDB: 7 Sep 2021. |
| Synonymous name | : | †Psittacosaurus guyangensis Cheng, 1983 | |
Ref: PBDB: 5 Dec 2017. |
| Synonymous name | : | †Psittacosaurus osborni Young, 1931 | |
Ref: PBDB: 17 May 2016. |
| Synonymous name | : | †Psittacosaurus protiguanodonensis Young, 1958 | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Psittacosaurus tingi Young, 1931 | |
Ref: PBDB: 17 May 2016. |