| Synonymous name | : | †Cetotherium ambiguum (Brandt, 1872) | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Pachyacanthus andrussovi Dombrovsky, 1925 | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Pachyacanthus bajarunasi Dombrovsky, 1925 | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Pachyacanthus letochae Brandt, 1873 | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Pachyacanthus trachyspondylus Brandt, 1871 | |
Ref: PBDB: 27 Oct 2013. |