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 | Parazoa |
| phylum | Porifera Grant in Todd, 1836 - sponges |
| class | Demospongiae Sollas, 1885 |
| order | Astrophorida Lévi, 1973 |
| family | Geodiidae Gray, 1867 |
| genus | Pachymatisma Bowerbank, 1866 |
| species | Pachymatisma bifida Burton, 1959 |