Orthogastropoda

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Gastropoda
Subclassis: Incertae sedis
Familiae: Archaeopragidae - Archinacellidae - Cliospiridae - †Gordenellidae - Omphalocirridae - Onychochilidae - †Pragoscutulidae - †Pragoserpulinidae - Yangtzespiriidae