†family Piraniidae Laubenfels 1955 (demosponge)
Demospongiae - Protomonaxonida - Piraniidae
Parent taxon: Protomonaxonida according to R. M. Finks et al. 2004
Sister taxa: Choiidae, Halichondritidae, Hamptoniidae, Hazeliidae, Heliospongiidae, Leptomitidae, Lobatospongia, Mahalospongiidae, Sinospongiidae, Sollasellidae, Takakkawiidae, Tethyidae, Ulospongiellidae, Wapkiidae
Subtaxa: Moleculospina Pirania
Type: Pirania
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution:
• Ordovician of Morocco (2 collections), the United Kingdom (2)
• Delamaran of Canada (13: British Columbia)
• Cambrian of Canada (3: Brithish Columbia, British Columbia), United States (1: Utah)
Total: 21 collections including 23 occurrences