Family Peltospiridae Superfamily Pleurotomarioidea Family Pleurotomariidae † Family Catantostomatidae † Family Kittlidiscidae † Family Phymatopleuridae † Family Polytremariidae † Family Portlockiellidae † Family Rhaphischismatidae † Family Trochotomidae † Family Zygitidae Superfamily †Porcellioidea † Family Porcelliidae † Family Cirridae † Family Discohelicidae † Family Pavlodiscidae Superfamily Scissurelloidea Family Scissurellidae Family Anatomidae Superfamily Seguenzioidea Family Seguenziidae Family Chilodontidae † Family Eucyclidae † Family Laubellidae Superfamily Trochoidea Family Trochidae Family Calliostomatidae † Family Elasmonematidae † Family Eucochlidae † Family Microdomatidae † Family Proconulidae Family Solariellidae † Family Tychobraheidae † Family Velainellidae Superfamily Turbinoidea Family Turbinidae Family Liotiidae Family Phasianellidae Clade Cocculiniformia Superfamily Cocculinoidea Family Cocculinidae Family Bathysciadiidae Clade Neritimorpha (= Neritopsina) Contains the Palaeozoic Neritomorpha of uncertain position and the clades Cyrtoneritimorpha and Cycloneritimorpha Unassigned to superfamily † Family Craspedostomatidae † Family Pragoscutulidae Superfamily Nerrhenoidea † Family Nerrhenidae Superfamily Oriostomatoidea † Family Oriostomatidae † Family Tubinidae Superfamily Palaeotrochoidea † Family Palaeotrochidae Superfamily Platyceratoidea † Family Platyceratidae Clade Cyrtoneritimorpha † Family Orthonychiidae † Family Vltaviellidae Clade Cycloneritimorpha Superfamily Helicinoidea Family Helicinidae † Family Dawsonellidae † Family Deaniridae Family Neritiliidae Family Proserpinellidae Family Proserpinidae Superfamily Hydrocenoidea Family Hydrocenidae Superfamily Neritoidea Family Neritidae Family Phenacolepadidae † Family Pileolidae Superfamily Neritopsoidea Family Neritopsidae † Family Cortinellidae † Family Delphinulopsidae † Family Plagiothyridae † Family Pseudorthonychiidae Family Titiscaniidae Superfamily Symmetrocapuloidea † Family Symmetrocapulidae Clade Caenogastropoda Contains the Caenogastropoda of uncertain systematic position, the informal group Architaenioglossa and the clades Sorbeoconcha and Hypsogastropoda Caenogastropoda of uncertain systematic position: Family Lyocyclidae Thiele, 1925 † Family Plicatusidae † Family Spanionematidae † Family Spirostylidae Superfamily Abyssochrysoidea Tomlin, 1927 Acanthonematidae Wenz, 1938 † Superfamily Acteoninoidea † Family Acteoninidae † Family Anozygidae † Family Soleniscidae Superfamily Dendropupoidea † Family Dendropupidae † Family Anthracopupidae Superfamily Paleostyloidea † Family Palaeostylidae † Family Goniasmatidae † Family Pithodeidae Superfamily Peruneloidea † Family Perunelidae † Family Chuchlinidae † Family Imoglobidae † Family Sphaerodomidae Superfamily Pseudomelanioidea † Family Pseudomelaniidae † Family Trajanellidae Superfamily Subulitoidea † Family Subulitidae † Family Ischnoptygmatidae grade Zygopleuroid group - see Changes since 2005 † Family Zygopleuridae Family Abyssochrysidae † Family Polygyrinidae † Family Protorculidae Family Provannidae † Family Pseudozygopleuridae Informal group Architaenioglossa Superfamily Ampullarioidea Family Ampullariidae † Family Naricopsinidae Superfamily Cyclophoroidea Family Cyclophoridae Family Aciculidae Family Craspedopomatidae Family Diplommatinidae † Family Ferussinidae Family Maizaniidae Family Megalomastomatidae Family Neocyclotidae Family Pupinidae Superfamily Viviparoidea Family Viviparidae † Family Pliopholygidae Clade Sorbeoconcha Not allocated to superfamily † Family Acanthonematidae † Family Canterburyellidae † Family Prisciphoridae Superfamily Cerithioidea Family