Protonychophora

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: †Lobopodia
Classis: †Xenusia
Ordo: †Protonychophora
Familiae: †Aysheaiidae – †Xenusiidae

Protonychophora Hutchinson, 1930: 23

• Hutchinson, G.E. 1930. Restudy of some Burgess Shale fossils. Proceedings of the United States National Museum 78(2854): 1–24. BHL.