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 | Blastozoa Sprinkle, 1973 |
| class | Blastoidea Say, 1825 † |
| order | Spiraculata † |
| family | Pentremitidae d'Orbigny, 1851 † |
| genus | Pentremites Say, 1820 † |
| species | Pentremites sulcatus Roemer, 1851 † |