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 | Deuterostomia - deuterostomes |
| phylum | Echinodermata Bruguière, 1791 - echinoderms |
| subphylum | Crinozoa Matsumoto, 1929 |
| class | Crinoidea Miller, 1821 |
| subclass | Cladida Moore & Laudon, 1943 † |
| order | Dendrocrinida Bather, 1899 † |
| family | Proctothylacocrinidae Kier, 1952 † |