Family Petrosiidae van Soest 1980 (demosponge)
Demospongiae - Haplosclerida - Petrosiidae
Parent taxon: Haplosclerida according to R. M. Finks et al. 2004
Sister taxa: Calcifibrospongiidae, Corralio, Desmacidonidae, Esperites, Eurydiscites, Euzkadiellidae, Haliclonidae, Newellidae, Petrosistroma, Thalamnohaliclona
Subtaxa: Petrosia Propetrosia
Type: Petrosia
Ecology: stationary epifaunal suspension feeder
Distribution: found only at Sta. Cecilia, Vic area, La Guixa Member, Ebro Basin, Catalonia (Eocene of Spain)