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Mollusca (132 791)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 009)
Class Caudofoveata (143)
Class Cephalopoda (1 834)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 697)
Subclass Amphigastropoda † (390)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 636)
Subterclass Sorbeoconcha (147)
Superorder Hypsogastropoda
Order Architaenioglossa (4 918)
Superfamily Ampullarioidea Gray, 1824 (250)
Superfamily Cyclophoroidea J. E. Gray, 1847 (3 904)
Family Aciculidae J. E. Gray, 1850 (103)
Family Acmeidae Pollonera, 1905 accepted as Aciculidae J. E. Gray, 1850
Family Alycaeidae W. T. Blanford, 1864 accepted as Alycaeinae W. T. Blanford, 1864
Family Bolaniidae Wenz, 1915 accepted as Craspedopomatidae Kobelt & Möllendorff, 1898
Family Cochlostomatidae Kobelt, 1902 (118)
Family Craspedopomatidae Kobelt & Möllendorff, 1898 (21)
Family Cyclophoridae J. E. Gray, 1847 (1 604)
Family Cytoridae Climo, 1969 accepted as Liareinae A. W. B. Powell, 1946
Family Dicristidae A. N. Golikov & Starobogatov, 1975 accepted as Neocyclotidae Kobelt & Möllendorff, 1897
Family Diplommatinidae L. Pfeiffer, 1856 (1 026)
Family Ferussinidae Wenz, 1923 (1915) † accepted as Ferussininae Wenz, 1923 (1915) †
Family Hainesiidae Thiele, 1929 (220)
Family Lagocheilidae Stoliczka, 1872 accepted as Cyclophoridae J. E. Gray, 1847
Family Maizaniidae Tielecke, 1940 (40)
Family Megalomastomatidae W. T. Blanford, 1864 (100)
Subfamily Cochlostomatinae Kobelt, 1902 accepted as Cochlostomatidae Kobelt, 1902
Subfamily Megalomastomatinae W. T. Blanford, 1864 accepted as Megalomastomatidae W. T. Blanford, 1864
Subfamily Megalostomatinae [sic] accepted as Megalomastomatinae W. T. Blanford, 1864
Subfamily Neopupininae Kobelt, 1902 accepted as Megalomastomatinae W. T. Blanford, 1864
Genus Ajkaia Tausch, 1886 † (2)
Genus Aperostoma Troschel, 1847 (47)
Subgenus Aperostoma (Amphicyclotus) Crosse & P. Fischer, 1879 accepted as Amphicyclotus Crosse & P. Fischer, 1879
Subgenus Aperostoma (Aperostoma) Troschel, 1847 represented as Aperostoma Troschel, 1847
Subgenus Aperostoma (Aperostomops) Pilsbry, 1935 accepted as Calaperostoma Pilsbry, 1935
Subgenus Aperostoma (Austrocyclotus) Bartsch, 1942 accepted as Neocyclotus Crosse & P. Fischer, 1886
Subgenus Aperostoma (Buckleyia) E. T. Higgins, 1872 accepted as Daronia A. Adams, 1861
Subgenus Aperostoma (Calaperostoma) Pilsbry, 1935 accepted as Calaperostoma Pilsbry, 1935
Subgenus Aperostoma (Cycladamsia) Bartsch, 1942 accepted as Cycladamsia Bartsch, 1942
Subgenus Aperostoma (Cyclohidalgoa) Bartsch, 1942 represented as Aperostoma Troschel, 1847
Subgenus Aperostoma (Cyclopomops) Bartsch & J. P. E. Morrison, 1942 accepted as Cyclopomops Bartsch & J. P. E. Morrison, 1942
Subgenus Aperostoma (Incidostoma) Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma Bartsch & J. P. E. Morrison, 1942
Species Aperostoma (Incidostoma) carmioli Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma carmioli (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma (Incidostoma) dilatatum F. Haas, 1955 accepted as Aperostoma dilatatum F. Haas, 1955
Species Aperostoma (Incidostoma) hedui Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma hedui (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma (Incidostoma) hitomi Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma hitomi (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma (Incidostoma) incomptum (G. B. Sowerby I, 1850) accepted as Incidostoma incomptum (G. B. Sowerby I, 1850)
Species Aperostoma (Incidostoma) kobelti Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma kobelti (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma (Incidostoma) malleatum Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma malleatum (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma (Incidostoma) nirafe Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma nirafe (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma (Incidostoma) pergrande (Kobelt, 1912) accepted as Incidostoma pergrande (Kobelt, 1912)
Species Aperostoma (Incidostoma) pichinchense Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma pichinchense (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma (Incidostoma) pizarroi Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma pizarroi (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma (Incidostoma) stirlingi Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma stirlingi (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma (Incidostoma) superstructum F. Haas, 1955 represented as Aperostoma superstructum F. Haas, 1955
Subgenus Aperostoma (Neocyclotus) Crosse & P. Fischer, 1886 accepted as Neocyclotus Crosse & P. Fischer, 1886
Subgenus Aperostoma (Ptychocochlis) C. T. Simpson, 1895 accepted as Poteria J. E. Gray, 1850
Species Aperostoma agassizi Bartsch & J. P. E. Morrison, 1942 accepted as Neocyclotus agassizi (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma allantayum Bartsch & J. P. E. Morrison, 1942
Species Aperostoma amazonense Bartsch & J. P. E. Morrison, 1942
Species Aperostoma balsasense Bartsch & J. P. E. Morrison, 1942
Species Aperostoma bartletti H. Adams, 1870 accepted as Lagocyclus bartletti (H. Adams, 1870)
Species Aperostoma belli (R. H. Beddome, 1908)
Species Aperostoma bisinuatum (E. von Martens, 1864) accepted as Neocyclotus bisinuatus (E. von Martens, 1864)
Species Aperostoma blanchetianum (S. Moricand, 1836)
Species Aperostoma bogotense (L. Pfeiffer, 1855)
Species Aperostoma bolcense Oppenheim, 1895 † accepted as Cyclotellina bolcensis (Oppenheim, 1895) †
Species Aperostoma boliviense Bartsch & J. P. E. Morrison, 1942
Species Aperostoma brujense Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma duffianum (C. B. Adams, 1845)
Species Aperostoma cardozi (H. B. Baker, 1923)
Species Aperostoma carmioli Bartsch & J. P. E. Morrison, 1942
Species Aperostoma castaneum Bartsch & J. P. E. Morrison, 1942
Species Aperostoma caucaense (S. I. Da Costa, 1901)
Species Aperostoma cingulatum (G. B. Sowerby I, 1843)
Species Aperostoma colombiense (S. I. Da Costa, 1901)
Species Aperostoma confusum Sykes, 1901 accepted as Incidostoma confusum (Sykes, 1901)
Species Aperostoma connivens H. Adams, 1867 accepted as Neocyclotus connivens (H. Adams, 1867)
Species Aperostoma cooperi (Tryon, 1863) accepted as Dicrista cooperi (Tryon, 1863)
Species Aperostoma costaricense (E. von Martens, 1876) accepted as Incidostoma costaricense (E. von Martens, 1876)
Species Aperostoma cumingi Bartsch & J. P. E. Morrison, 1942
Species Aperostoma currani Bartsch & J. P. E. Morrison, 1942
Species Aperostoma depressum (S. I. Da Costa, 1906)
Species Aperostoma dilatatum F. Haas, 1955
Species Aperostoma dunkeri (L. Pfeiffer, 1857) accepted as Incidostoma dunkeri (L. Pfeiffer, 1857)
Species Aperostoma dysoni (L. Pfeiffer, 1851) accepted as Neocyclotus dysoni (L. Pfeiffer, 1853)
Species Aperostoma fasciatum (Kobelt, 1912)
Species Aperostoma filoliratum (G. B. Sowerby III, 1892)
Species Aperostoma fischeri (Hidalgo, 1867)
Species Aperostoma fultoni Bartsch & J. P. E. Morrison, 1942
Species Aperostoma giganteum (Reeve, 1842) accepted as Incidostoma giganteum (Reeve, 1842)
Species Aperostoma inca (A. d'Orbigny, 1835)
Species Aperostoma inconspicuum (G. B. Sowerby I, 1843)
Species Aperostoma indecisum F. Haas, 1952
Species Aperostoma irregulare (L. Pfeiffer, 1855) accepted as Incidostoma irregulare (L. Pfeiffer, 1855)
Species Aperostoma lacteofluviale Pilsbry & A. P. Brown, 1910 accepted as Poteria lacteofluvialis (Pilsbry & A. P. Brown, 1910)
Species Aperostoma laxatum (G. B. Sowerby I, 1850)
Species Aperostoma leai Bartsch & J. P. E. Morrison, 1942
Species Aperostoma lutescens (L. Pfeiffer, 1853) accepted as Mexcyclotus lutescens (L. Pfeiffer, 1853)
Species Aperostoma masvense Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma masvense (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma mazzinorum Oppenheim, 1895 † accepted as Cyclotellina mazzinorum (Oppenheim, 1895) †
Species Aperostoma merrilli Bartsch & J. P. E. Morrison, 1942
Species Aperostoma mexicanum (Menke, 1830)
Species Aperostoma nanum P. Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma nanum (P. Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma nevadense Bartsch & J. P. E. Morrison, 1942
Species Aperostoma olivaceum Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma quitense (L. Pfeiffer, 1852)
Species Aperostoma paezense Bartsch & J. P. E. Morrison, 1942
Species Aperostoma paezicolum Bartsch & J. P. E. Morrison, 1942
Species Aperostoma pailaense Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma pailaense (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma palenquensis Pilsbry, 1935 accepted as Megacyclotus palenquensis (Pilsbry, 1935)
Species Aperostoma palmeri (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma pazi (Crosse, 1866) accepted as Incidostoma pazi (Crosse, 1866)
Species Aperostoma perezi (Hidalgo, 1866) accepted as Incidostoma perezi (Hidalgo, 1866)
Species Aperostoma peruense Bartsch & J. P. E. Morrison, 1942
Species Aperostoma peruvianum (S. I. Da Costa, 1906)
Species Aperostoma pittieri (E. von Martens, 1900) accepted as Incidostoma pittieri (E. von Martens, 1900)
Species Aperostoma popayanum (I. Lea, 1838) accepted as Incidostoma popayanum (I. Lea, 1838)
Species Aperostoma portobellense Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma portobellense (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma primigenia (Matheron, 1888) †
Species Aperostoma princeps Pilsbry, 1935 accepted as Barbacyclus princeps (Pilsbry, 1935)
Species Aperostoma pulchellum Bartsch & J. P. E. Morrison, 1942
Species Aperostoma quitense (L. Pfeiffer, 1852) accepted as Incidostoma quitense (L. Pfeiffer, 1852)
Species Aperostoma redfieldi Bartsch & J. P. E. Morrison, 1942
Species Aperostoma salengoense Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma salengoense (Bartsch & J. P. E. Morrison, 1942)
Species Aperostoma sanctamarthae Pilsbry & G. H. Clapp, 1902 accepted as Neocyclotus sanctamarthae (Pilsbry & G. H. Clapp, 1902)
Species Aperostoma schunkei F. Haas, 1955
Species Aperostoma smile Bartsch & J. P. E. Morrison, 1942
Species Aperostoma smithi Pilsbry & G. H. Clapp, 1902 accepted as Neocyclotus smithi (Pilsbry & G. H. Clapp, 1902)
Species Aperostoma subcingulatum (Kobelt, 1912)
Species Aperostoma superstructum F. Haas, 1955
Species Aperostoma translucidum (G. B. Sowerby I, 1843)
Species Aperostoma tryonianum Pilsbry & A. P. Brown, 1910 accepted as Cyclobakeria tryoniana (Pilsbry & A. P. Brown, 1910)
Species Aperostoma umbilicatum Bartsch & J. P. E. Morrison, 1942
Species Aperostoma utriaense Bartsch & J. P. E. Morrison, 1942
Species Aperostoma venezuelensis Bartsch & J. P. E. Morrison, 1942
Species Aperostoma veracochanum Bartsch & J. P. E. Morrison, 1942
Species Aperostoma viridulum F. Haas, 1952
Species Aperostoma walkeri H. B. Baker, 1928
Genus Cyclohidalgoa Bartsch, 1942 accepted as Aperostoma (Cyclohidalgoa) Bartsch, 1942
Genus Cyclopoma Troschel, 1847 accepted as Cyclopomops Bartsch & J. P. E. Morrison, 1942
Genus Cyclopomops Bartsch & J. P. E. Morrison, 1942 (1)
Genus Cyrtotoma Mörch, 1852 accepted as Aperostoma Troschel, 1847
Genus Farcimen Troschel, 1847 (33)
Genus Farcimoides Bartsch, 1942 (3)
Genus Habropoma Crosse & P. Fischer, 1880 accepted as Aperostoma Troschel, 1847
Genus Lomastoma S. P. Woodward, 1856 accepted as Megalomastoma Swainson, 1840
Genus Megaloma S. P. Woodward, 1854 accepted as Megalomastoma Swainson, 1840
Genus Megalomastoma Swainson, 1840 (6)
Genus Megalostoma accepted as Megalomastoma Swainson, 1840
Genus Neopupina Kobelt, 1902 (3)
Genus Tomocyclus Crosse & P. Fischer, 1872 (5)
Family Megalostomatidae [sic] accepted as Megalomastomatidae W. T. Blanford, 1864
Family Neocyclotidae Kobelt & Möllendorff, 1897 (242)
Family Pupinidae L. Pfeiffer, 1853 (427)
Family Strophostomatidae Wenz, 1915 † accepted as Ferussininae Wenz, 1923 (1915) †
Genus Carinomphalus W. Yü, 1974 † (1)
Genus Diplommoptychia Maillard, 1884 †
Genus Loriolina Huckriede, 1967 † (1)
Genus Maillardinus Bandel, 1991 † (1)
Superfamily Viviparoidea Gray, 1847 (764)
Order Caenogastropoda incertae sedis (7 676)
Order Littorinimorpha (17 179)
Order Neogastropoda (23 716)
Order Stenoglossa accepted as Neogastropoda
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 156)
Subclass Neomphaliones accepted as Vetigastropoda
Subclass Neritimorpha (1 914)
Subclass Orthogastropoda represented as Gastropoda
Subclass Patellogastropoda (511)
Subclass Prosobranchia
Subclass Psilogastropoda represented as Gastropoda
Subclass Vetigastropoda (6 782)
Class Lamellibranchiata accepted as Bivalvia
Class Loricata accepted as Polyplacophora
Class Mollusca incertae sedis † (372)
Class Monoplacophora (229)
Class Pelecypoda accepted as Bivalvia
Class Polyplacophora (1 377)
Class Polyplaxiphora accepted as Polyplacophora
Class Rostroconchia † (64)
Class Scaphopoda (752)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata