Superregnum: Eukaryota Cladus: Unikonta Cladus: Opisthokonta Cladus: Holozoa Kingdom: Animalia Subregnum: Eumetazoa Cladus: ParaHoxozoa Cladus: Bilateria Cladus: Nephrozoa Cladus: Protostomia Cladus: Spiralia Cladus: Lophotrochozoa Phylum: Sipuncula Classis: Sipunculidea Ordo: Golfingiiformes
Familia: Genera: Onchnesoma – Phascolion
Phascolionidae Cutler & Gibbs 1985