Caudinidae

Cladus: Eukaryota
Supergroup: Unikonta
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Echinodermata
Subphylum: Eleutherozoa
Superclassis: Cryptosyringida
Classis: Holothuroidea
Subclassis: Apodacea
Ordo: Molpadiida
Familia: Caudinidae
Genera: Caudina - Hedingia - Paracaudina

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