Xenosiphon

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Sipuncula
Classis: Sipunculidea
Ordo: Sipunculiformes
Familia: Sipunculidae
Genus: Xenosiphon
Species: X. branchiatus - X. caribaeus - X. mundanus