Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Echinodermata
Subphylum: Eleutherozoa
Superclassis: Cryptosyringida
Classis: Echinoidea
Subclassis: Euechinoidea
Superordo: Atelostomata
Ordo: Spatangoida
Subordo: Holasterina
Familia: Urechinidae
Genera: Carnarechinus - Pilematechinus - Plexechinus - Sternopatagus - Urechinus
Retrieved from "http://en.wikipedia.org/"
All text is available under the terms of the GNU Free Documentation License
