Apogastropoda was previously used as a major taxonomic grouping of sea snails, marine gastropod molluscs. This infraclass mostly consisted of marine limpets and operculate snails. At least 20,000 species were considered to exist within the two clades that were included, Heterobranchia and Caenogastropoda.
Gastropods that were placed in this taxon have bifurcate tentacle nerves and two pedal commissures.
Older morphological and molecular studies appeared to show that the Caenogastropoda and Heterobranchia should be considered as sister taxa, comprising the Apogastropoda.
This taxon was used in taxonomy of the Gastropoda (Ponder & Lindberg, 1997).
However this taxonomic grouping is no longer used (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). It is out-dated because more recent molecular studies have proved that it contains two separate evolutionary lineages, the two clades mentioned above.
Apogastropoda was also rejected according to the nucleotide sequence of mitochondrial genome in 2008.
Anaclodonta
Archaeobranchia
Architectonicoida
Ctenobranchia
Gymnoglossa
Heterophrosynidae
Oligopteria
Orbacea
Peristomacea
Potamophila
Taenioglossa
Apogastropoda comprised taxa as follows according to the taxonomy of the Gastropoda (Ponder & Lindberg, 1997):
Superorder Caenogastropoda Cox, 1960
Order Architaenioglossa Haller, 1890Superfamily Ampullarioidea J.E. Gray, 1824Superfamily Cyclophoroidea J.E. Gray, 1847 (terrestrial)Order Sorbeoconcha Ponder & Lindberg, 1997Suborder Cerithiimorpha Golikov & Starobogatov, 1975Superfamily SpanionematoideaSuborder Hypsogastropoda Ponder & Lindberg, 1997Infraorder Littorinimorpha Golikov & Starobogatov, 1975Superfamily Calyptraeoidea Lamarck, 1809Superfamily Capuloidea J. Fleming, 1822Superfamily Carinarioidea Blainville, 1818Superfamily Cingulopsoidea Fretter & Patil, 1958Superfamily Cypraeoidea Rafinesque, 1815 (cowries)Superfamily Ficoidea Meek, 1864Superfamily Laubierinoidea Warén & Bouchet, 1990Superfamily Littorinoidea (Children), 1834 (periwinkles)Superfamily Naticoidea Forbes, 1838 (moon shells)Superfamily Rissooidea J.E. Gray, 1847 (Risso shells)Superfamily Stromboidea Rafinesque, 1815 (true conchs)Superfamily Tonnoidea Suter, 1913Superfamily Trivioidea Troschel, 1863Superfamily Vanikoroidea J.E. Gray, 1840Superfamily Velutinoidea J.E. Gray, 1840Superfamily Vermetoidea Rafinesque, 1815 (worm shells)Superfamily Xenophoroidea Troschel, 1852 (carrier shells)Infraorder Neogastropoda Thiele, 1929Superfamily Buccinoidea (whelks, false tritions)Superfamily Cancellarioidea Forbes & Hanley, 1851Superfamily Conoidea Rafinesque, 1815Superfamily Muricoidea Rafinesque, 1815Infraorder Ptenoglossa J.E. Gray, 1853Superfamily Eulimoidea Philippi, 1853Superfamily Janthinoidea Lamarck, 1812Superfamily Triphoroidea J.E. Gray, 1847Suborder Discopoda P. Fischer, 1884 - sometimes included in CerithiimorphaSuperfamily Campaniloidea Douvillé, 1904Superfamily Cerithioidea Férussac, 1822Suborder Murchisoniina Cox & Knight, 1960Superfamily Loxonematoidea Koken, 1889Superorder Heterobranchia J.E. Gray, 1840
Order Heterostropha P. Fischer, 1885Superfamily Architectonicoidea J.E. Gray, 1840Family Architectonicidae Gray, 1850Superfamily Omalogyroidea G.O. Sars, 1878Superfamily Pyramidelloidea J.E. Gray, 1840Superfamily Rissoelloidea J.E. Gray, 1850Superfamily Valvatoidea J.E. Gray, 1840Order Opisthobranchia Milne-Edwards, 1848Suborder Nudibranchia Blainville, 1814 (nudibranchs)Infraorder Anthobranchia Férussac, 1819Superfamily Doridoidea Rafinesque, 1815Superfamily Doridoxoidea Bergh, 1900Superfamily Onchidoridoidea Alder & Hancock, 1845Superfamily Polyceroidea Alder & Hancock, 1845Infraorder Cladobranchia Willan & Morton, 1984Superfamily Aeolidioidea J.E. Gray, 1827Superfamily Arminoidea Rafinesque, 1814Superfamily Dendronotoidea Allman, 1845Superfamily Metarminoidea Odhner in Franc, 1968Suborder Anaspidea P. Fischer, 1883 (sea hares)Superfamily Akeroidea Pilsbry, 1893Superfamily Aplysioidea Lamarck, 1809Suborder Cephalaspidea P. Fischer, 1883Superfamily Acteonoidea D'Orbigny, 1835Superfamily Bulloidea Lamarck, 1801Superfamily Cylindrobulloidea Thiele, 1931Superfamily Diaphanoidea Odhner, 1914Superfamily Haminoeoidea Pilsbry, 1895Superfamily Philinoidea J.E. Gray, 1850Superfamily Ringiculoidea Philippi, 1853Suborder Gymnosomata Blainville, 1824 (sea angels)Suborder Notaspidea P. Fischer, 1883Superfamily Pleurobranchoidea Férussac, 1822Superfamily Tylodinoidea J.E. Gray, 1847Suborder Sacoglossa Von Ihering, 1876Superfamily Oxynooidea H. & A. Adams, 1854Suborder Thecosomata Blainville, 1824 (sea butterflies)Infraorder EuthecosomataSuperfamily LimacinoideaSuperfamily CavolinioideaInfraorder PseudothecosomataSuperfamily PeraclidoideaSuperfamily CymbulioideaOrder Pulmonata Cuvier in Blainville, 1814 (pulmonates)Subinfraorder OrthurethraSuperfamily Achatinelloidea Gulick, 1873Superfamily Cochlicopoidea Pilsbry, 1900Superfamily Partuloidea Pilsbry, 1900Superfamily Pupilloidea Turton, 1831Subinfraorder SigmurethraSuperfamily Acavoidea Pilsbry, 1895Superfamily Achatinoidea Swainson, 1840Superfamily Aillyoidea Baker, 1960Superfamily Arionoidea J.E. Gray in Turnton, 1840Superfamily Buliminoidea Clessin, 1879Superfamily Camaenoidea Pilsbry, 1895Superfamily Clausilioidea Mörch, 1864Superfamily Dyakioidea Gude & Woodward, 1921Superfamily Gastrodontoidea Tryon, 1866Superfamily Helicoidea Rafinesque, 1815Superfamily Helixarionoidea Bourguignat, 1877Superfamily Limacoidea Rafinesque, 1815Superfamily Oleacinoidea H. & A. Adams, 1855Superfamily Orthalicoidea Albers-Martens, 1860Superfamily Plectopylidoidea Moellendorf, 1900Superfamily Polygyroidea Pilsbry, 1894Superfamily Punctoidea Morse, 1864Superfamily Rhytidoidea Pilsbry, 1893Superfamily Sagdidoidera Pilsbry, 1895Superfamily Staffordioidea Thiele, 1931Superfamily Streptaxoidea J.E. Gray, 1806Superfamily Strophocheiloidea Thiele, 1926Superfamily Trigonochlamydoidea Hese, 1882Superfamily Zonitoidea Mörch, 1864Infraorder Acteophila Dall, 1885Superfamily Melampoidea Stimpson, 1851Infraorder Trimusculiformes Minichev & Starobogatov, 1975Superfamily Trimusculoidea Zilch, 1959Infraorder Stylommatophora A. Schmidt, 1856 (land snails)Suborder Basommatophora Keferstein in Bronn, 1864 (freshwater pulmonates)Superfamily Acroloxoidea Thiele, 1931Superfamily Amphiboloidea J.E. Gray, 1840Superfamily Chilinoidea H. & A. Adams, 1855Superfamily Glacidorboidea Ponder, 1986Superfamily Lymnaeoidea Rafinesque, 1815Superfamily Planorboidea Rafinesque, 1815Superfamily Siphonarioidea J.E. Gray, 1840Suborder Eupulmonata Haszprunar & Huber, 1990Suborder Systellommatophora Pilsbry, 1948Superfamily Onchidioidea Rafinesque, 1815Superfamily Otinoidea H. & A. Adams, 1855Superfamily Rathouisioidea Sarasin, 1889
