Vetigastropoda Salvini-Plawen, 1980 - archaeogastropods s.l.
   Family Phasianellidae Swainson, 1840
   Seguenzioidea Verrill, 1884
   1 Family Neomphalidae McLean, 1981
   2.1 Family Peltospiridae McLean, 1989 - taper-snout limpets
   2.2.1.1 Family Pleurotomariidae Swainson, 1840 - slit snails
   2.2.1.2.1.1.1 Family Haliotidae Rafinesque, 1815 - abalones
   2.2.1.2.1.1.2.1 Family Lepetodrilidae McLean, 1988
   2.2.1.2.1.1.2.2 Family Scissurellidae Gray, 1847
   2.2.1.2.1.2.1 Family Stomatellidae J.E. Gray, 1840 see Subfamily Stomatellinae Gray, 1840
   2.2.1.2.1.2.2 Genus Gibbula Risso, 1826
   2.2.1.2.2.1.1 Family Trochidae Rafinesque, 1815 - top snails
   2.2.1.2.2.1.2 Family Turbinidae Rafinesque, 1815 - turban snails
   2.2.1.2.2.2.1 Genus Homalopoma Carpenter, 1864
   2.2.1.2.2.2.2.1 Family Clypeosectidae McLean, 1989
   2.2.1.2.2.2.2.2.1 Family Anatomidae McLean, 1989
   2.2.1.2.2.2.2.2.2 Family Fissurellidae Fleming, 1822 - keyhole limpets
   2.2.2 "Cocculiniformia" Hazsprunar, 1987 see Superorder Cocculiniformia Haszprunar, 1987