Position in a system
| system | Vitae - living organisms |
| domain | Eukaryota Whittaker & Margulis, 1978 - lifeforms with nucletic cells |
| superregnum | Unikonta |
| system | Opisthokonta Cavalier-Smith, 1987 |
| kingdom | Animalia Linnaeus, 1758 - animals |
| subregnum | Eumetazoa Butschli, 1910 |
| divisio | Bilateria Hatschek, 1888 - bilaterians |
| subdivisio | Protostomia Grobben, 1908 - protostomes |
| phylum | Arthropoda Gravenhorst, 1843 - arthropods |
| Arthropoda incertae sedis | |
| superclassis | Artiopoda Hou & Bergström, 1997 † |
| class | Trilobita Walch, 1771 - trilobites † |
| order | Agnostida Salter, 1864 † |
| suborder | Agnostina † |
| superfamily | Agnostoidea † |
| family | Agnostidae McCoy, 1849 † |