Phylum Mollusca Linnaeus, 1758 - molluscs
   Subphylum Conchifera Gegenbauer, 1878
     Class Gastropoda Cuvier, 1795 - snails and slugs
       Subclass Orthogastropoda Ponder & Lindberg, 1995
         Superorder Heterobranchia Burmeister, 1837
           Order Opisthobranchia Milne-Edwards, 1848
             Suborder Cephalaspidea Fischer, 1883 - bubble snails see Order Cephalaspidea Fischer, 1883
               Superfamily Philinoidea Gray, 1850 (1815)
                 1 Family Aglajidae Pilsbry, 1895 (1847)
                 2 Family Cylichnidae Adams & Adams, 1854
                 3 Family Gastropteridae Swainson, 1840
                 4 Family Philinidae Gray, 1850 (1815)
                 5 Family Philinoglossidae Hertling, 1932
                 6 Family Retusidae Thiele, 1925