| Current rank | : | Petromyzontida (Infraclass) | |
Ref: M.J. Benton, 2015: [433]; 2 Apr 2025. [inferred] |
| Former rank | : | Petromyzontida (Subclass) | |
Ref: J.S. Nelson et al., 2016: 23. [inferred] |
| Current spelling | : | Petromyzonti (Class) | |
Ref: R. van der Laan et al. (eds.), 2021: (4 Feb 2025). [inferred] |