Order
Agnostida Salter, 1864
Klassificering
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Arthropoda |
| Subphylum | incertae sedis |
| Chelicerata | |
| Crustacea | |
| Trilobita | |
| Class | Insecta |
| Merostomoidea | |
| Infraclass | Phosphatocopina |
| Order | Agnostida |
| Suborder | Agnostina |
| Eodiscina | |
| Family | Clavagnostidae |
| Diplagnostidae | |
| Glyptagnostidae | |
| Ptychagnostidae | |
| Spinagnostidae | |
| Order | Leperditicopida |
| Nektaspida | |
| Species | Gdowia |