†family Piraniidae Laubenfels 1955 (demosponge)
Parent taxon: Protomonaxonida according to R. M. Finks et al. 2004
Sister taxa: Choiidae, Halichondritidae, Hamptoniidae, Hazeliidae, Leptomitidae, Lobatospongia, Sollasellidae, Takakkawiidae, Tethyidae, Ulospongiellidae, Wapkiidae
Subtaxa: Moleculospina, Pirania
Ecology: stationary intermediate-level epifaunal suspension feeder