| Synonymous name | : | †Centrosaurus longirostris Sternberg, 1940 | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Monoclonius cutleri Brown, 1917 | |
Ref: PBDB: 6 Aug 2020. |
| Synonymous name | : | †Monoclonius dawsoni Lambe, 1902 | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Monoclonius flexus Brown, 1914 | |
Ref: PBDB: 6 Aug 2020. |