| Accepted name | : | Petromyzontida (Subclass) | |
|
| Synonymous name | : | Cephalaspidomorpha (Class) | |
|
| Synonymous name | : | Monorhina (Class) Haeckel, 1895 | |
Ref: J.S. Nelson et al., 2016: 33. |
| Accepted name (pro parte) | : | †Osteostraci (Class) Lankester, 1868 | |
Ref: R. van der Laan, 2018: 22. [inferred] |
| Accepted name (pro parte) | : | Petromyzontida (Class) | |
Ref: R. van der Laan, 2018: 15. |