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 | Brachiopoda Duméril, 1806 - lamp shells |
| subphylum | Linguliformea |
| class | Lingulata |
| order | Lingulida Waagen, 1885 |
| superfamily | Discinoidea Gray, 1840 |
| family | Discinidae Gray, 1840 |
| subfamily | Disciniscinae Schuchert & LeVene, 1929 |
| genus | Kosoidea Havlíček & Mergl, 1988 † |