Phylum Mollusca Linnaeus, 1758 - molluscs
   Subphylum Conchifera Gegenbauer, 1878
     Class Gastropoda Cuvier, 1795 - snails and slugs
       Subclass Orthogastropoda Ponder & Lindberg, 1995
         Superorder Neritaemorphi Koken, 1896 see Order Neritimorpha Golikov & Starobogatov, 1975
           Order Neritopsina Cox & Knight, 1960 see Order Neritimorpha Golikov & Starobogatov, 1975
             Superfamily Neritoidea Rafinesque, 1815
               1 Family Neritidae Rafinesque, 1815 - nerites
               2 Family Neritiliidae Schepman, 1908
               3 Family Neritopsidae Gray, 1847
               4 Family Phenacolepadidae Pilsbry, 1895
               5 Family Hydrocenidae Troschel, 1857
               6 Family Helicinidae Férussac, 1822 - helicinids
               7 Family Proserpinidae Gray, 1847
               8 Family Ceresidae Thiele, 1925 see Family Proserpinellidae Baker, 1923
               9 Family Titiscaniidae Bergh, 1890