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Mollusca (132 754)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (24 992)
Class Caudofoveata (143)
Class Cephalopoda (1 832)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 679)
Subclass Amphigastropoda † (387)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 623)
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 154)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 431)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 103)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 567)
Order Aillyida accepted as Achatinina
Order Ellobiida (579)
Order Gymnomorpha accepted as Systellommatophora
Order Stylommatophora (24 764)
Suborder Achatinina (2 899)
Suborder Elasmognatha accepted as Succineoidei
Suborder Helicina (21 625)
Infraorder Arionoidei (140)
Infraorder Clausilioidei (1 859)
Infraorder Helicina incertae sedis (3 210)
Infraorder Helicoidei (5 690)
Infraorder Limacoidei (4 250)
Superfamily Dyakioidea Gude & B. B. Woodward, 1921 accepted as Trochomorphoidea Mörch, 1864
Superfamily Gastrodontoidea Tryon, 1866 (621)
Superfamily Helicarionoidea Bourguignat, 1877 (1 862)
Family Ariophantidae Godwin-Austen, 1883 (739)
Family Girasiidae Collinge, 1902 accepted as Girasiini Collinge, 1902
Family Gudeoconchidae Iredale, 1944 accepted as Helicarionidae Bourguignat, 1877
Family Helicarionidae Bourguignat, 1877 (650)
Subfamily Durgellinae Godwin-Austen, 1888 (283)
Tribe Durgellini Godwin-Austen, 1888 (258)
Genus Aenigmatoconcha C. Tumpeesuwan & S. Tumpeesuwan, 2017 (4)
Species Aenigmatoconcha clivicola C. Tumpeesuwan & S. Tumpeesuwan, 2017
Species Aenigmatoconcha eunetis Pholyotha & Panha, 2021
Species Aenigmatoconcha mitis (L. Pfeiffer, 1863)
Species Aenigmatoconcha sumonthai C. Tumpeesuwan & S. Tumpeesuwan, 2018
Genus Austenia G. Nevill, 1878 (17)
Genus Cavicola Ancey, 1887 accepted as Kaliella W. T. Blanford, 1863
Genus Conulema Stoliczka, 1871 accepted as Sitala H. Adams, 1865
Genus Cryptaustenia T. D. A. Cockerell, 1891 (24)
Genus Cryptibycus T. D. A. Cockerell, 1891 accepted as Girasia J. E. Gray, 1855
Genus Durgella W. T. Blanford, 1863 (23)
Genus Durgellina Thiele, 1928 (15)
Genus Eurychlamys Godwin-Austen, 1899 (7)
Genus Haughtonia Godwin-Austen, 1899 accepted as Rhyssotopsis Ancey, 1887
Genus Holkeion Godwin-Austen, 1908 (3)
Genus Ibycus Heynemann, 1863 (9)
Genus Leptodontarion P. Sarasin & F. Sarasin, 1899 accepted as Ibycus Heynemann, 1863
Genus Muangnua Solem, 1966 (3)
Genus Nesaecia Gude, 1911
Genus Pseudaustenia T. D. A. Cockerell, 1891 (2)
Genus Rasama Laidlaw, 1932 (2)
Genus Rhyssotopsis Ancey, 1887 (1)
Genus Rotularia Mörch, 1872 accepted as Nesaecia Gude, 1911
Genus Rotungia Godwin-Austen, 1918 (1)
Genus Sarama Godwin-Austen, 1908 accepted as Rasama Laidlaw, 1932
Genus Saramina Wenz, 1947 accepted as Rasama Laidlaw, 1932
Genus Satiella W. T. Blanford & Godwin-Austen, 1908 (10)
Genus Sitala H. Adams, 1865 (102)
Genus Sivella W. T. Blanford, 1863 (26)
Genus Sophina W. H. Benson, 1859 (6)
Genus Teraia Solem, 1966 (3)
Tribe Girasiini Collinge, 1902 (15)
Genus Burmochlamys Pholyotha & Panha, 2022 (9)
Genus Siamochlamys Pholyotha, 2023 (1)
Subfamily Helicarioninae Bourguignat, 1877 (360)
Genus Apothapsia D. T. Holyoak & G. A. Holyoak, 2020 (2)
Genus Dendrolamellaria Preston, 1913 (1)
Genus Fanulum Iredale, 1913 accepted as Diastole Gude, 1913
Genus Helixarion A. Férussac, 1821 accepted as Helicarion A. Férussac, 1821
Genus Kermarion Iredale, 1944 (1)
Genus Nevelasta Iredale, 1937 accepted as Coneuplecta Möllendorff, 1893
Genus Ovachlamys T. Habe, 1946 (2)
Genus Ubiquitarion Hyman, Lamborena & Köhler, 2017 (1)
Family Myotestidae Collinge, 1902 accepted as Ostracolethinae Simroth, 1901
Family Urocyclidae Simroth, 1889 (467)
Genus Pilula E. von Martens, 1898 (3)
Genus Sagdellina Cossmann, 1889 † (3)
Superfamily Limacoidea Batsch, 1789 (364)
Superfamily Limacoidei incertae sedis (3)
Superfamily Parmacelloidea P. Fischer, 1856 (1855)
Superfamily Trochomorphoidea Mörch, 1864 (1 190)
Superfamily Zonitoidea Mörch, 1864 (118)
Family Milacidae Ellis, 1926 (55)
Family Parmacellidae P. Fischer, 1856 (1855) (26)
Family Trigonochlamydidae Hesse, 1882 (11)
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