Between brackets is the number of accepted species

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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)
- Subfamily Ariophantinae Godwin-Austen, 1883 (218)
- Genus Ariophanta Des Moulins, 1829 (26)
- Genus Bapuia Godwin-Austen, 1918 (1)
- Genus Corneoxesta Iredale, 1941 accepted as Xesta Albers, 1850
- Genus Cryptogirasia T. D. A. Cockerell, 1891 (1)
- Genus Cryptosoma Theobald, 1857 accepted as Megaustenia T. D. A. Cockerell, 1913
- Genus Cryptozona Mörch, 1872 (11)
- Genus Dalingia Godwin-Austen, 1907 (1)
- Genus Dihangia Godwin-Austen, 1916 (1)
- Genus Euplecta C. Semper, 1870 (46)
- Genus Euplectella Jousseaume, 1894 accepted as Ariophanta (Celectella) Schileyko, 2002
- Genus Galongia Godwin-Austen, 1916 (1)
- Genus Hemiplecta Albers, 1850 (66)
- Subgenus Hemiplecta (Ryssota) Albers, 1850 accepted as Ryssota Albers, 1850
- Species Hemiplecta abbasi Maassen, 2009
- Species Hemiplecta achilles Brazier, 1886
- Species Hemiplecta adolescens E. A. Smith, 1899 accepted as Sasakina oxyconus (E. von Martens, 1896)
- Species Hemiplecta ambitiosa Fulton, 1921
- Species Hemiplecta andaiensis (E. A. Smith, 1897)
- Species Hemiplecta antonii (C. Semper, 1870) accepted as Ryssota antonii (C. Semper, 1870)
- Species Hemiplecta auriettae (Tapparone Canefri, 1889)
- Species Hemiplecta basileus (W. H. Benson, 1861) accepted as Ariophanta basileus (W. H. Benson, 1861)
- Species Hemiplecta bathensis G. C. Robson, 1914 accepted as Kalidos bathensis (G. C. Robson, 1914)
- Species Hemiplecta beddomei W. T. Blanford, 1874 accepted as Ariophanta beddomei (W. T. Blanford, 1874)
- Species Hemiplecta beddomii W. T. Blanford, 1874 accepted as Ariophanta beddomei (W. T. Blanford, 1874)
- Species Hemiplecta belerang Cilia & Abbas, 2012
- Species Hemiplecta berschaueri Thach & Abbas, 2020
- Species Hemiplecta bonthainensis E. A. Smith, 1896
- Species Hemiplecta braammorrisi (P. Sarasin & F. Sarasin, 1899)
- Species Hemiplecta buettikoferi Schepman, 1896
- Species Hemiplecta bulla (L. Pfeiffer, 1843) accepted as Lamarckiella bulla (L. Pfeiffer, 1843)
- Species Hemiplecta cartereti (E. A. Smith, 1884)
- Species Hemiplecta chevalieri (Souleyet, 1842) accepted as Hemiplecta chevalierii (Souleyet, 1842)
- Species Hemiplecta chevalierii (Souleyet, 1842)
- Species Hemiplecta crenocarinata Schepman, 1919
- Species Hemiplecta cymatium (L. Pfeiffer, 1856)
- Species Hemiplecta darondeauii (Souleyet, 1842)
- Species Hemiplecta demmeri F. Haas, 1912 accepted as Asperitas trochus (O. F. Müller, 1774)
- Species Hemiplecta densa (A. Adams & Reeve, 1850)
- Species Hemiplecta densegranosa Schepman, 1919 accepted as Hemiglyptopsis densegranosa (Schepman, 1919)
- Species Hemiplecta denserugata (Möllendorff, 1901)
- Species Hemiplecta dichromatica Morlet, 1889 accepted as Sarika siamensis (L. Pfeiffer, 1856)
- Species Hemiplecta distincta (L. Pfeiffer, 1850)
- Species Hemiplecta divergens (Brancsik, 1895)
- Species Hemiplecta doriae (Tapparone Canefri, 1880)
- Species Hemiplecta dura (L. Pfeiffer, 1864)
- Species Hemiplecta dvitija (O. Semper, 1866) accepted as Ryssota dvitija (O. Semper, 1866)
- Species Hemiplecta egeria E. A. Smith, 1895
- Species Hemiplecta enisa W. T. Blanford, 1881
- Species Hemiplecta esculenta Maassen, 2006
- Species Hemiplecta floweri E. A. Smith, 1899
- Species Hemiplecta foersteri Kobelt, 1914
- Species Hemiplecta franzhuberi Thach, 2020 accepted as Hemiplecta distincta (L. Pfeiffer, 1850)
- Species Hemiplecta funerea (E. A. Smith, 1896)
- Species Hemiplecta goliath van Benthem Jutting, 1959
- Species Hemiplecta gordoniae (W. H. Benson, 1863)
- Species Hemiplecta granigera Ancey, 1895
- Species Hemiplecta gummata (G. B. Sowerby I, 1841) accepted as Atrichoconcha gummata (G. B. Sowerby I, 1841)
- Species Hemiplecta hepatica (Reeve, 1851) accepted as Lamarckiella hepatica (Reeve, 1851)
- Species Hemiplecta huberi Thach, 2017
- Species Hemiplecta huberi (Thach, 2017) accepted as Hemiplecta lanxangnica Inkhavilay & Panha, 2019
- Species Hemiplecta humphreysiana (I. Lea, 1840)
- Species Hemiplecta internota E. A. Smith, 1898 accepted as Elaphroconcha fruhstorferi (E. von Martens, 1896)
- Species Hemiplecta jamuensis Theobald, 1878 accepted as Bensonies jamuensis (Theobald, 1878)
- Species Hemiplecta jansoni E. A. Smith, 1905 accepted as Zagmena jansoni (E. A. Smith, 1905)
- Species Hemiplecta jensi Páll-Gergely, 2019
- Species Hemiplecta juvenilis B. Rensch, 1930 accepted as Elaphroconcha juvenilis (B. Rensch, 1930)
- Species Hemiplecta khamducensis (Thach & F. Huber, 2018)
- Species Hemiplecta khamducensis Thach & F. Huber, 2020 accepted as Hemiplecta khamducensis (Thach & F. Huber, 2018)
- Species Hemiplecta lahatensis (de Morgan, 1885)
- Species Hemiplecta lanxangnica Inkhavilay & Panha, 2019
- Species Hemiplecta laotica (Möllendorff, 1899)
- Species Hemiplecta leechi de Morgan, 1886 accepted as Quantula striata (J. E. Gray, 1834)
- Species Hemiplecta liei Thach, 2018
- Species Hemiplecta ligorica Sutcharit & Panha, 2021
- Species Hemiplecta malaouyi (de Morgan, 1886)
- Species Hemiplecta malleata I. Rensch & B. Rensch, 1929
- Species Hemiplecta marangensis (Aldrich, 1898)
- Species Hemiplecta melleata I. Rensch & B. Rensch, 1929
- Species Hemiplecta mindanaensis (C. Semper, 1870)
- Species Hemiplecta monticola (W. H. Benson, 1838) accepted as Macrochlamys monticola (W. H. Benson, 1838)
- Species Hemiplecta nemorosa Sutcharit & Panha, 2021
- Species Hemiplecta nigrescens (Möllendorff, 1888) accepted as Lamarckiella nigrescens (Möllendorff, 1888)
- Species Hemiplecta nobilis (L. Pfeiffer, 1850)
- Species Hemiplecta obliquata (Reeve, 1852)
- Species Hemiplecta obliqueundulata van Benthem Jutting, 1959
- Species Hemiplecta oleata Ancey, 1902 accepted as Kalidos oleatus (Ancey, 1902)
- Species Hemiplecta ougarrana E. A. Smith, 1905 accepted as Zagmena ougarrana (E. A. Smith, 1905)
- Species Hemiplecta papuana C. R. Boettger, 1914
- Species Hemiplecta pernobilis (A. Férussac, 1821)
- Species Hemiplecta pharangensis (Möllendorff, 1901)
- Species Hemiplecta platytaenia Möllendorff, 1900
- Species Hemiplecta pluto (L. Pfeiffer, 1863)
- Species Hemiplecta praeculta E. A. Smith, 1895
- Species Hemiplecta profuga Ancey, 1902 accepted as Kalidos profugus (Ancey, 1902)
- Species Hemiplecta rabongensis E. A. Smith, 1895
- Species Hemiplecta rasori F. Haas, 1912
- Species Hemiplecta recognita I. Rensch, 1930 accepted as Hemiplecta malleata recognita I. Rensch, 1930
- Species Hemiplecta recondita I. Rensch, 1930
- Species Hemiplecta retrorsa (A. Gould, 1843)
- Species Hemiplecta ribbei (Dohrn, 1883)
- Species Hemiplecta rollei Möllendorff, 1899
- Species Hemiplecta rufa (R. P. Lesson, 1831)
- Species Hemiplecta rugata (E. von Martens, 1864)
- Species Hemiplecta sagittifera (L. Pfeiffer, 1842) accepted as Ryssota sagittifera (L. Pfeiffer, 1842)
- Species Hemiplecta sakaya (de Morgan, 1886)
- Species Hemiplecta salangana (E. von Martens, 1883)
- Species Hemiplecta scrobiculata (Gredler, 1885) accepted as Sinoxychilus scrobiculatus (Gredler, 1885)
- Species Hemiplecta semilucida Brancsik, 1895 accepted as Nanina (Hemiglypta) semilucida (Brancsik, 1895)
- Species Hemiplecta sericea C. R. Boettger, 1914
- Species Hemiplecta sibylla (Tapparone Canefri, 1884)
- Species Hemiplecta simalurensis Laidlaw, 1957
- Species Hemiplecta simoni Jousseaume, 1894
- Species Hemiplecta sowerbyana (L. Pfeiffer, 1841) accepted as Trukrhysa pachystoma (Hombron & Jacquinot, 1841)
- Species Hemiplecta stevenliei Thach & Abbas, 2021
- Species Hemiplecta strubelli Möllendorff, 1899
- Species Hemiplecta subsulcata Möllendorff, 1902
- Species Hemiplecta textrina (W. H. Benson, 1866)
- Species Hemiplecta thailandica Sutcharit & Panha, 2021
- Species Hemiplecta theodori (R. A. Philippi, 1847) accepted as Sarika theodori (R. A. Philippi, 1847)
- Species Hemiplecta tinostoma W. T. Blanford, 1881
- Species Hemiplecta totojensis (P. Sarasin & F. Sarasin, 1899)
- Species Hemiplecta undosa (W. T. Blanford, 1865)
- Species Hemiplecta uter (Theobald, 1859)
- Species Hemiplecta weberi (P. Sarasin & F. Sarasin, 1899)
- Species Hemiplecta wichmanni (P. Sarasin & F. Sarasin, 1899)
- Species Hemiplecta zimmayensis Godwin-Austen, 1888 accepted as Hemiplecta distincta (L. Pfeiffer, 1850)
- Genus Indrella Godwin-Austen, 1901 (2)
- Genus Janbinmorpha Pholyotha & Panha, 2024 (1)
- Genus Khasiella Godwin-Austen, 1899 (11)
- Genus Koratia Godwin-Austen, 1919 accepted as Hemiplecta Albers, 1850
- Genus Mariaella J. E. Gray, 1855 (2)
- Genus Mariella [sic] accepted as Mariaella J. E. Gray, 1855
- Genus Megaustenia T. D. A. Cockerell, 1913 (17)
- Genus Nanina J. E. Gray, 1834 accepted as Xesta Albers, 1850
- Genus Naninia Zilch, 1959 accepted as Xesta Albers, 1850
- Genus Naninia G. B. Sowerby I, 1842 accepted as Xesta Albers, 1850
- Genus Nilgiria Godwin-Austen, 1888 accepted as Cryptozona Mörch, 1872
- Genus Ratnadvipia Godwin-Austen, 1899 (3)
- Genus Ravana Godwin-Austen, 1901 (1)
- Genus Schwammeria Schileyko, 2010 (1)
- Genus Sitalinopsis Thiele, 1931 (1)
- Genus Taphrospira W. T. Blanford, 1904 (4)
- Genus Tennentia Humbert, 1862 accepted as Mariaella J. E. Gray, 1855
- Genus Vega Westerlund, 1883 accepted as Mariaella J. E. Gray, 1855
- Genus Xesta Albers, 1850 (21)
- Genus Xestina Pfeffer, 1878 accepted as Cryptozona Mörch, 1872
- Subfamily Chroninae Thiele, 1931 accepted as Chronidae Thiele, 1931
- Subfamily Kaliellinae Thiele, 1931 accepted as Chronidae Thiele, 1931
- Subfamily Macrochlamydinae Godwin-Austen, 1888 (464)
- Subfamily Ostracolethinae Simroth, 1901 (45)
- Genus Bensonies H. B. Baker, 1938 (10)
- Genus Falsiplecta Schileyko & Semenyuk, 2018 (1)
- Genus Maelamaodiscus Sutcharit & Pholyotha, 2023 (1)
- Family Girasiidae Collinge, 1902 accepted as Girasiini Collinge, 1902
- Family Gudeoconchidae Iredale, 1944 accepted as Helicarionidae Bourguignat, 1877
- Family Helicarionidae Bourguignat, 1877 (650)
- 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