| Synonymous name | : | †Hemistylops paucicuspidatus Ameghino, 1904 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Hemistylops trigonostyloides Ameghino, 1904 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Henricosbornia alouatina Ameghino, 1904 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Henricosbornia subconica Ameghino, 1904 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Henricosbornia waitehor Simpson, 1935 | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Microstylops clarus Ameghino, 1901 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Microstylops monoconus Ameghino, 1904 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Pantostylops completus Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Pantostylops incompletus (Ameghino, 1901) | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Peripantostylops orehor Simpson, 1935 | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Polystylops progrediens Ameghino, 1904 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Prohyracotherium matutinum Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Prohyracotherium patagonicum Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Selenoconus centralis Ameghino, 1901 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Selenoconus senex Ameghino, 1901 | |
Ref: PBDB: 26 Jul 2015. |
| Synonymous name | : | †Selenoconus spiculatus Ameghino, 1902 | |
Ref: PBDB: 26 Jul 2015. |