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)
- Infraorder Limacoidei (4 250)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 578)
- Superfamily Bulimuloidea Tryon, 1867 accepted as Orthalicoidea E. von Martens, 1860
- Superfamily Orthalicoidea E. von Martens, 1860 (1 578)
- Family Amphibulimidae P. Fischer, 1873 (109)
- Family Bothriembryontidae Iredale, 1937 (168)
- Family Bulimulidae Tryon, 1867 (940)
- Subfamily Berendtiinae P. Fischer & Crosse, 1872 accepted as Bulimulinae Tryon, 1867
- Subfamily Bostrycinae Breure, 2012 (219)
- Subfamily Bulimulidae incertae sedis (9)
- Subfamily Bulimulinae Tryon, 1867 (309)
- Tribe Odontostomini Pilsbry & Vanatta, 1898 accepted as Odontostomidae Pilsbry & Vanatta, 1898
- Tribe Simpulopsini Schileyko, 1999 accepted as Simpulopsidae Schileyko, 1999
- Genus Adzharia P. Hesse, 1933 accepted as Bulimulus Leach, 1814
- Genus Anctus E. von Martens, 1860 (3)
- Genus Atahualpa Strebel, 1910 accepted as Thaumastus E. von Martens, 1860
- Genus Auris Spix, 1827 (9)
- Genus Berendtia Crosse & P. Fischer, 1869 (1)
- Genus Bocourtia Rochebrune, 1882 (38)
- Genus Bulimulus Leach, 1814 (66)
- Genus Cochlogena A. Férussac, 1821 accepted as Bulimulus Leach, 1814
- Genus Cochlorina Jan, 1830 (8)
- Species Cochlorina aurisleporis (Bruguière, 1792)
- Species Cochlorina aurismuris (S. Moricand, 1838)
- Species Cochlorina chanchamayensis (Hidalgo, 1870) accepted as Drymaeus chanchamayensis (Hidalgo, 1870)
- Species Cochlorina intensior (Pilsbry, 1898)
- Species Cochlorina involuta (E. von Martens, 1867)
- Species Cochlorina lateralis (Menke, 1828)
- Species Cochlorina lateritia (Pilsbry, 1898)
- Species Cochlorina navicula (J. A. Wagner, 1827)
- Species Cochlorina uranops (Pilsbry, 1898)
- Genus Graptostracus Pilsbry, 1939 accepted as Leiostracus (Graptostracus) Pilsbry, 1939
- Genus Helicteres A. Férussac, 1821 accepted as Achatinella (Achatinellastrum) L. Pfeiffer, 1854
- Genus Kuschelenia Hylton Scott, 1951 accepted as Bocourtia (Kuschelenia) Hylton Scott, 1951
- Genus Llaucanianus Weyrauch, 1967 (1)
- Genus Loboa Ihering, 1917 accepted as Bulimulus Leach, 1814
- Genus Naesiotus Albers, 1850 (122)
- Genus Navicula Spix, 1827 accepted as Cochlorina Jan, 1830
- Genus Newboldius Pilsbry, 1932 (2)
- Genus Otostomus H. Beck, 1837 (1)
- Genus Oxychona Mörch, 1852 (8)
- Genus Pachyotus H. Beck, 1837 accepted as Auris Spix, 1827
- Genus Plecochilus Agassiz, 1846 accepted as Plekocheilus Guilding, 1827
- Genus Plicolumna J. G. Cooper, 1895 accepted as Rabdotus (Plicolumna) J. G. Cooper, 1895
- Genus Protoglyptus Pilsbry, 1897 (10)
- Genus Rabdotus Albers, 1850 (20)
- Genus Rhabdotus [sic] accepted as Rabdotus Albers, 1850
- Genus Rhaphiellus L. Pfeiffer, 1856 accepted as Naesiotus Albers, 1850
- Genus Rimatula Parodiz, 1946 accepted as Protoglyptus Pilsbry, 1897
- Genus Sanniostracus Salvador, F. S. Silva & Cavallari, 2023 (3)
- Genus Siphalomphix Rafinesque, 1833 accepted as Bulimulus Leach, 1814
- Genus Spartocentrum Dall, 1895 (5)
- Genus Sphaeroconcha Breure, 1978 (1)
- Genus Spiroscutalus Pilsbry, 1932 accepted as Scutalus Albers, 1850
- Genus Stenostoma Spix, 1827 accepted as Anctus E. von Martens, 1860
- Genus Stenostylus Pilsbry, 1898 (6)
- Genus Suniellus Breure, 1978 (5)
- Genus Teneritia J. Mabille, 1898 accepted as Rabdotus Albers, 1850
- Genus Xenothauma Fulton, 1896 accepted as Scutalus (Xenothauma) Fulton, 1896
- Genus Zaplagius Pilsbry, 1896 accepted as Cochlorina Jan, 1830
- Subfamily Odontostominae Pilsbry & Vanatta, 1898 accepted as Odontostomidae Pilsbry & Vanatta, 1898
- Subfamily Peltellinae Gray, 1855 (403)
- Genus Bulimus Bruguière, 1789
- Genus Liostracus [sic] accepted as Leiostracus Albers, 1850
- Family Cyclodontinidae Salvador & Breure, 2023 (110)
- Family Liguidae Pilsbry, 1891 accepted as Orthalicidae E. von Martens, 1860
- Family Megaspiridae Pilsbry, 1904 (58)
- Family Orthalicidae E. von Martens, 1860 (108)
- Family Placostylidae Pilsbry, 1946 accepted as Placostylinae Pilsbry, 1946
- Family Simpulopsidae Schileyko, 1999 (61)
- Family Tomogeridae Jousseaume, 1877 (24)
- 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