Hexactinellidae
Animalia | Porifera | Hexactinellida | Hexactinosida | Hexactinellidae
Tretodictyidae
Biota | Animalia | Porifera | Hexactinellida | Hexasterophora | Sceptrulophora | Tretodictyidae
|  | Grant, 1836 | Schmidt, 1870 | Schulze, 1886 | Mehl, 1992 | Schulze, 1886