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 | Echinozoa |
| class | Echinoidea Leske, 1778 |
| subclass | Euechinoidea Bronn, 1860 |
| superorder | Stirodonta Jackson, 1912 |
| order | Phymosomatoida Mortensen, 1904 † |
| Phymosomatoida incertae sedis | |
| genus | Leptechinus Gauthier, 1889 † |