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 |
| subdivisio | Protostomia Grobben, 1908 - protostomes |
| phylum | Arthropoda - Arthropods |
| subphylum | Trilobitomorpha † |
| class | Trilobita Walch, 1771 † |
| order | Ptychopariida † |
| suborder | Ptychopariina † |
| superfamily | Ptychoparioidea † |
| family | Solenopleuridae Angelin, 1854 † |
| genus | Crusoia Walcott, 1924 † |
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