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Lithonida

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Parazoa
Phylum: Porifera
Classis: Calcarea
Subclassis: Calcaronea
Ordo: Lithonida
Familiae: Minchinellidae - Petrobionidae

Source: Wikispecies: All text is available under the terms of the GNU Free Documentation License