Petrobionidae

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Parazoa
Phylum: Porifera
Classis: Calcarea
Subclassis: Calcaronea
Ordo: Lithonida
Familia: Petrobionidae
Genus: Petrobiona