| Synonymous name | : | †Orthutaetus clavatus Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Orthutaetus crenulatus Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Posteutatus indemnis Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Posteutatus indentatus Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Posteutatus scabridus Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Utaetus argos Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Utaetus laxus Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |