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 |
| Animalia incertae sedis | |
| class | Palaeoscolecida Conway Morris & Robinson, 1986 † |
| genus | Chalazoscolex Conway Morris & Peel, 2010 † |