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 | Platyhelminthes Minot, 1876 - flatworms |
| subphylum | Turbellaria Ehrenberg, 1831 |
| order | Polycladida |
| suborder | Acotylea |
| superfamily | Ilyplanoidea Faubel, 1984 |
| family | Ilyplanidae Faubel, 1983 |
| genus | Postenterogonia Faubel, 1983 |
| species | Postenterogonia orbicularis (Schmarda, 1859) |