living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Mollusca Linnaeus, 1758 - molluscs
           Class Gastropoda Cuvier, 1795 - snails and slugs
             Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
               Order Mesogastropoda Thiele, 1925 - mesogastropods see [unranked] mesogastropods
                 Superfamily Rissoacea Gray, 1847 see Superfamily Rissooidea Gray, 1847
                   01 Family Hydrobiidae Stimpson, 1865
                   02 Family Pomatiopsidae Stimpson, 1865
                   03 Family Truncatellidae Gray, 1840
                   04 Family Stenothyridae Tryon, 1866
                   05 Family Iravadiidae Thiele, 1928
                   06 Family Baicaliidae Fischer, 1885 see Subfamily Baicaliinae Fischer, 1885
                   07 Family Benedictiidae Clessin, 1880 see Subfamily Benedictiinae Clessin, 1880
                   08 Family Micromelaniidae Dybowski & Grochmalicki, 1914 see Subfamily Pyrgulinae Brusina, 1882 (1869)
                   09 Family Emmericiidae Brusina, 1870 see Subfamily Emmericiinae Brusina, 1870, nom. protect.
                   10 Family Rissoidae Gray, 1847
                   11 Family Assimineidae Adams & Adams, 1856
                   12 Family Aciculidae Gray, 1850
                   13 Family Skeneopsidae Iredale, 1915
                   14 Family Omalogyridae Sars, 1878
                   15 Family Trachysmatidae Thiele, 1925 see Family Pendromidae Warén, 1991
                   16 Family Rissoellidae Gray, 1850
                   17 Family Trochaclididae Thiele, 1928 see Family Ataphridae Cossmann, 1915
                   18 Family Lepyriidae Pilsbry & Olsson, 1951 see Subfamily Lithoglyphinae Tryon, 1866
                   19 Family Cingulopsidae Fretter & Patil, 1958
                   20 Family Orbitestellidae Iredale, 1917
                   21 Family Caecidae Gray, 1850 - caecids
                   22 Family Ctiloceratidae Iredale & Laseron, 1957 see Subfamily Ctiloceratinae Iredale & Laseron, 1957
                   23 Family Vitrinellidae Bush, 1897 see Subfamily Vitrinellinae Bush, 1897
                   24 Family Tornidae Sacco, 1896 (1884)
                   25 Family Rastodentidae Ponder, 1966