Order
Anaspidiformes
Luokittelu
| Organism group | Biota |
| Domain | Eukaryota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Superclass | Agnatha |
| Class | Cephalaspidomorphi |
| Subclass | Anaspida |
| Order | Anaspidiformes |
| Birkeniiformes |
| Organism group | Biota |
| Domain | Eukaryota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Superclass | Agnatha |
| Class | Cephalaspidomorphi |
| Subclass | Anaspida |
| Order | Anaspidiformes |
| Birkeniiformes |