Between brackets is the number of accepted species

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- Mollusca (132 738)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 984)
- Class Caudofoveata (143)
- Class Cephalopoda (1 830)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 673)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 618)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 153)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 430)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 102)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 566)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 763)
- Suborder Achatinina (2 899)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 624)
- Infraorder Arionoidei (139)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 690)
- Superfamily Helicoidea Rafinesque, 1815 (5 491)
- Family Ariantidae Mörch, 1864 accepted as Ariantinae Mörch, 1864
- Family Bradybaenidae Pilsbry, 1934 (1898) accepted as Camaenidae Pilsbry, 1895
- Family Calyciidae Iredale, 1941 accepted as Hadrinae Iredale, 1937
- Family Camaenidae Pilsbry, 1895 (2 898)
- Family Canariellidae Schileyko, 1991 (56)
- Family Cepolidae Ihering, 1909 (102)
- Family Chloritidae Iredale, 1938 accepted as Hadrinae Iredale, 1937
- Family Cochlicellidae Schileyko, 1972 accepted as Cochlicellini Schileyko, 1972
- Family Cochlicellinae Schileyko, 1972 accepted as Cochlicellini Schileyko, 1972
- Family Cochlostylidae Möllendorff, 1890 accepted as Helicostylinae Ihering, 1909 (1890)
- Family Echinichidae F. G. Thompson & Naranjo-García, 2012 accepted as Echinichinae F. G. Thompson & Naranjo-García, 2012
- Family Elonidae E. Gittenberger, 1977 (63)
- Family Epiphragmophoridae Hoffmann, 1928 (72)
- Genus Angrandiella Ancey, 1886 accepted as Epiphragmophora (Angrandiella) Ancey, 1886
- Genus Dinotropis Pilsbry & T. D. A. Cockerell, 1937 (1)
- Genus Epiphragmophora Doering, 1875 (68)
- Subgenus Epiphragmophora (Angrandiella) Ancey, 1886 represented as Epiphragmophora Doering, 1875
- Subgenus Epiphragmophora (Doeringina) Ihering, 1929 represented as Epiphragmophora Doering, 1875
- Subgenus Epiphragmophora (Epiphragmophora) Doering, 1875 represented as Epiphragmophora Doering, 1875
- Subgenus Epiphragmophora (Helminthoglypta) Ancey, 1887 accepted as Helminthoglypta Ancey, 1887
- Subgenus Epiphragmophora (Karlschmidtia) F. Haas, 1955 represented as Epiphragmophora Doering, 1875
- Subgenus Epiphragmophora (Micrarionta) Ancey, 1880 accepted as Micrarionta Ancey, 1880
- Subgenus Epiphragmophora (Monadenia) Pilsbry, 1895 accepted as Monadenia Pilsbry, 1895
- Subgenus Epiphragmophora (Pilsbrya) Ancey, 1887 accepted as Pilsbrya Ancey, 1887
- Subgenus Epiphragmophora (Trichodiscina) E. von Martens, 1892 accepted as Trichodiscina E. von Martens, 1892
- Species Epiphragmophora alsophila (R. A. Philippi, 1867)
- Species Epiphragmophora anceyana Preston, 1909
- Species Epiphragmophora andivaga Ancey, 1899
- Species Epiphragmophora angrandi (Morelet, 1863)
- Species Epiphragmophora argentina (Holmberg, 1909)
- Species Epiphragmophora arizonensis Dall, 1895 accepted as Sonorella arizonensis (Dall, 1895)
- Species Epiphragmophora arnheimi Dall, 1895 accepted as Helminthoglypta contracostae (Pilsbry, 1895)
- Species Epiphragmophora arrosa (W. G. Binney, 1858) accepted as Helminthoglypta arrosa arrosa (W. G. Binney, 1858)
- Species Epiphragmophora atahualpa Pilsbry, 1944
- Species Epiphragmophora audouinii (A. d'Orbigny, 1835)
- Species Epiphragmophora basiplanata Weyrauch, 1960
- Species Epiphragmophora bernardius Pilsbry, 1900
- Species Epiphragmophora birabeni Parodiz, 1955
- Species Epiphragmophora bowersi Bryant, 1900 accepted as Sonorelix bowersi (Bryant, 1900)
- Species Epiphragmophora californiensis
- Species Epiphragmophora callistoderma Pilsbry & Ferriss, 1917 accepted as Helminthoglypta callistoderma (Pilsbry & Ferriss, 1917)
- Species Epiphragmophora catalinae Dall, 1900 accepted as Micrarionta rufocincta (Newcomb, 1864)
- Species Epiphragmophora cerrateae Weyrauch, 1960
- Species Epiphragmophora circumcarinata (Stearns, 1879) accepted as Monadenia circumcarinata (Stearns, 1879)
- Species Epiphragmophora claromphalos (Deville & Hupé, 1850)
- Species Epiphragmophora clausa Hylton Scott, 1951
- Species Epiphragmophora clausomphalos (Deville & Hupé, 1850)
- Species Epiphragmophora connectens F. Haas, 1959
- Species Epiphragmophora costellata D. Fernández & Rumi, 1974
- Species Epiphragmophora crassula Dall, 1900 accepted as Xerarionta levis crassula (Dall, 1900)
- Species Epiphragmophora cryptomphala Ancey, 1897
- Species Epiphragmophora cuyamacensis
- Species Epiphragmophora cuyana (L. Pfeiffer, 1867) accepted as Bostryx cuyanus (L. Pfeiffer, 1867)
- Species Epiphragmophora diluta (L. Pfeiffer, 1842)
- Species Epiphragmophora dormeri Gude, 1901
- Species Epiphragmophora dupetithouarsi
- Species Epiphragmophora ellipsostoma Pilsbry, 1894 accepted as Eremarionta ellipsostoma (Pilsbry, 1894)
- Species Epiphragmophora escoipensis Cuezzo, 1996
- Species Epiphragmophora estella (A. d'Orbigny, 1835)
- Species Epiphragmophora exarata
- Species Epiphragmophora farrisi (L. Pfeiffer, 1859) accepted as Pilsbrya farrisi (L. Pfeiffer, 1859)
- Species Epiphragmophora feruglioi Parodiz, 1969 †
- Species Epiphragmophora fidelis (J. E. Gray, 1834) accepted as Monadenia fidelis (J. E. Gray, 1834)
- Species Epiphragmophora granulosa Weyrauch, 1960
- Species Epiphragmophora guadelupiana Dall, 1898 accepted as Micrarionta guadalupiana (Dall, 1898)
- Species Epiphragmophora gueinzii (L. Pfeiffer, 1857)
- Species Epiphragmophora guevarai Cuezzo, 2006
- Species Epiphragmophora haasi Zilch, 1953
- Species Epiphragmophora hachitana Dall, 1895 accepted as Sonorella hachitana (Dall, 1895)
- Species Epiphragmophora harperi Bryant, 1900 accepted as Sonorelix harperi harperi (Bryant, 1900)
- Species Epiphragmophora hemiclausa Hylton Scott, 1957
- Species Epiphragmophora hemiomphalos F. Haas, 1951
- Species Epiphragmophora hieronymi (Doering, 1875)
- Species Epiphragmophora higginsi (K. Miller, 1878)
- Species Epiphragmophora hillebrandi
- Species Epiphragmophora huancabambensis Pilsbry, 1926
- Species Epiphragmophora huanucensis (R. A. Philippi, 1867)
- Species Epiphragmophora infumata (A. Gould, 1855) accepted as Monadenia infumata (A. Gould, 1855)
- Species Epiphragmophora jaspidea (L. Pfeiffer, 1859)
- Species Epiphragmophora jujuyensis Hylton Scott, 1962
- Species Epiphragmophora kellettii Edson & Hannibal, 1911 accepted as Xerarionta tryoni hemphilli (Edson & Hannibal, 1911)
- Species Epiphragmophora kellettii (Forbes, 1850) accepted as Xerarionta kellettii (Forbes, 1850)
- Species Epiphragmophora lentiformis (F. Haas, 1955)
- Species Epiphragmophora leucanthea Dall, 1900
- Species Epiphragmophora leucobasis F. Haas, 1951
- Species Epiphragmophora llaguenica Zilch, 1953
- Species Epiphragmophora macasi (E. T. Higgins, 1872)
- Species Epiphragmophora malkini F. Haas, 1962
- Species Epiphragmophora mirabilis Weyrauch, 1960
- Species Epiphragmophora mollegrandensis L. S. Morton [in Morton & Herbst], 2007 †
- Species Epiphragmophora mormonum (L. Pfeiffer, 1857) accepted as Monadenia mormonum (L. Pfeiffer, 1857)
- Species Epiphragmophora multesima Pilsbry, 1926
- Species Epiphragmophora olssoni Pilsbry, 1926
- Species Epiphragmophora orcutti Dall, 1900 accepted as Xerarionta orcutti (Dall, 1900)
- Species Epiphragmophora oresigena (A. d'Orbigny, 1835)
- Species Epiphragmophora ormeai Weyrauch, 1956
- Species Epiphragmophora orophila Ancey, 1903
- Species Epiphragmophora oroyensis Pilsbry, 1926
- Species Epiphragmophora parodizi D. Fernández & Rumi, 1984
- Species Epiphragmophora patasensis (L. Pfeiffer, 1859)
- Species Epiphragmophora pelliscolubri (R. A. Philippi, 1867)
- Species Epiphragmophora petricola S. S. Berry, 1916 accepted as Helminthoglypta petricola (S. S. Berry, 1916)
- Species Epiphragmophora pilsbryi F. Haas, 1934
- Species Epiphragmophora pollonerae (Paravicini, 1894)
- Species Epiphragmophora proseni Hylton Scott, 1951
- Species Epiphragmophora puella Hylton Scott, 1951
- Species Epiphragmophora puntana (Holmberg, 1909)
- Species Epiphragmophora quirogai Cuezzo, 2006
- Species Epiphragmophora remondi (Tryon, 1863) accepted as Tryonigens remondi (Tryon, 1863)
- Species Epiphragmophora rhathymos (Holmberg, 1912)
- Species Epiphragmophora saltana Ancey, 1897
- Species Epiphragmophora semiclausa (E. von Martens, 1868)
- Species Epiphragmophora semiclausa Hylton Scott, 1951 accepted as Epiphragmophora hemiclausa Hylton Scott, 1957
- Species Epiphragmophora stearnsiana (Gabb, 1868) accepted as Xerarionta stearnsiana (Gabb, 1868)
- Species Epiphragmophora taulisensis Zilch, 1953 accepted as Pilsbrya taulisensis (Zilch, 1953)
- Species Epiphragmophora tomsici D. Fernández & Rumi, 1984
- Species Epiphragmophora traskii (Newcomb, 1861) accepted as Helminthoglypta traskii (Newcomb, 1861)
- Species Epiphragmophora trenquelleonis (L. Pfeiffer, 1850)
- Species Epiphragmophora trifasciata D. Fernández & Rumi, 1984
- Species Epiphragmophora trigrammephora (A. d'Orbigny, 1835)
- Species Epiphragmophora tucumanensis (Doering, 1875)
- Species Epiphragmophora tudiculata (A. Binney, 1843) accepted as Helminthoglypta tudiculata (A. Binney, 1843)
- Species Epiphragmophora turneri L. S. Morton [in Morton & Herbst], 2007 †
- Species Epiphragmophora turtoni Ancey, 1899
- Species Epiphragmophora urubambensis Pilsbry, 1926 accepted as Epiphragmophora diluta urubambensis Pilsbry, 1926
- Species Epiphragmophora variegata Hylton Scott, 1962
- Species Epiphragmophora veatchii (Newcomb, 1866) accepted as Xerarionta veatchii (Newcomb, 1866)
- Species Epiphragmophora villavilensis Parodiz, 1955
- Species Epiphragmophora walshi Cuezzo, 2006
- Species Epiphragmophora webbi Pilsbry, 1932
- Species Epiphragmophora zechae Pilsbry, 1916 accepted as Helminthoglypta petricola zechae (Pilsbry, 1916)
- Species Epiphragmophora zilchi Weyrauch, 1960
- Genus Karlschmidtia F. Haas, 1955 accepted as Epiphragmophora (Karlschmidtia) F. Haas, 1955
- Genus Minaselates Cuezzo & Pena, 2017 (1)
- Genus Pilsbrya Ancey, 1887 (2)
- Family Eulotidae Möllendorff, 1898 accepted as Bradybaenini Pilsbry, 1934 (1898)
- Family Geomitridae C. R. Boettger, 1909 (402)
- Family Helicellidae Ihering, 1909 accepted as Hygromiidae Tryon, 1866
- Family Helicidae Rafinesque, 1815 (500)
- Family Helicodontidae Kobelt, 1904 (26)
- Family Helminthoglyptidae Pilsbry, 1939 accepted as Helminthoglyptinae Pilsbry, 1939
- Family Humboldtianidae Pilsbry, 1939 accepted as Humboldtianinae Pilsbry, 1939
- Family Hygromiidae Tryon, 1866 (460)
- Family Jacostidae Pilsbry, 1948 accepted as Helicellini Ihering, 1909
- Family Labyrinthidae Borrero, Sei, D. G. Robinson & Rosenberg, 2017 (58)
- Family Lampadiidae Winckworth, 1945 accepted as Labyrinthidae Borrero, Sei, D. G. Robinson & Rosenberg, 2017
- Family Leucochroidae Westerlund, 1886 accepted as Sphincterochilinae Zilch, 1960 (1886)
- Family Lysinoidae Hoffmann, 1928 accepted as Lysinoinae Hoffmann, 1928
- Family Monadeniidae H. Nordsieck, 1987 accepted as Monadeniinae H. Nordsieck, 1987
- Family Papuinidae Iredale, 1938 accepted as Hadrinae Iredale, 1937
- Family Pentataeniidae Mörch, 1864 accepted as Helicini Rafinesque, 1815
- Family Planispiridae Iredale, 1941 accepted as Hadrinae Iredale, 1937
- Family Pleurodontidae Ihering, 1912 (57)
- Family Polygyridae Pilsbry, 1895 (311)
- Family Rhagadidae Iredale, 1938 accepted as Hadrinae Iredale, 1937
- Family Sphincterochilidae Zilch, 1960 (1886) (41)
- Family Thysanophoridae Pilsbry, 1926 (42)
- Family Trichodiscinidae H. Nordsieck, 1987 (11)
- Family Trissexodontidae H. Nordsieck, 1987 (46)
- Family Xanthonychidae Strebel & Pfeffer, 1880 (345)
- Tribe Canariellini Schileyko, 1991 accepted as Canariellidae Schileyko, 1991
- Genus Laxecostula Harzhauser & Neubauer, 2020 † (1)
- Superfamily Sagdoidea Pilsbry, 1895 (199)
- Infraorder Limacoidei (4 250)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 578)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 436)
- Infraorder Rhytidoidei (581)
- Infraorder Sagdoinei accepted as Helicoidei
- Infraorder Succineoidei (384)
- Suborder Orthurethra accepted as Pupilloidei
- Suborder Scolodontina (165)
- Suborder Sigmurethra accepted as Helicina
- Suborder Stylommatophora incertae sedis (75)
- Order Systellommatophora (224)
- Superorder Hygrophila (2 005)
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (4 285)
- Superorder Sacoglossa (391)
- Superorder Siphonarimorpha (163)
- Order Anaspidea accepted as Aplysiida
- Order Aplysiida (101)
- Order Aplysiomorpha accepted as Aplysiida
- Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
- Order Bullomorpha accepted as Cephalaspidea
- Order Cephalaspidea (1 034)
- Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
- Order Pteropoda (414)
- Order Runcinacea accepted as Runcinida
- Order Runcinida (80)
- Order Tectibranchiata
- Order Thecosomata
- Order Umbraculida (15)
- Superorder Euthyneura incertae sedis
- Infraclass Heterobranchia incertae sedis (478)
- Infraclass Mesoneura (108)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- 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