Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Caenogastropoda Cox, 1960 see Superorder Caenogastropoda Cox, 1960
         Superfamily Rissooidea Gray, 1847
           Family Rissoidae Gray, 1847
             Subfamily Rissoinae Gray, 1847
               Genus Onoba Adams & Adams, 1852
                 1 Subgenus Subestea Cotton, 1944
                 2 Subgenus Ovirissoa Hedley, 1916
                 3 Subgenus Manawatawhia Powell, 1937