Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Phylum: Gnathostomulida
Ordo: Bursovaginoidea
Subordo: Scleroperalia
Familia: Agnathiellidae - Clausognathiidae - Gnathostomariidae - Gnathostomulidae - Mesognathariidae - Onychognathiidae - Paucidentulidae - Problognathiidae - Rastrognathiidae
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