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 | Chordata Bateson, 1885 - chordates |
| subphylum | Tunicata Lamarck, 1816 - tunicates |
| class | Ascidiacea |
| order | Aplousobranchia |
| family | Polyclinidae |
| genus | Aplidium Savigny, 1816 |
| species | Aplidium formosum Kott, 2006 |