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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 670)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 172)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 449)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 121)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 585)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 782)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 630)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 691)
- Infraorder Limacoidei (4 251)
- 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)
- Subfamily Helicarioninae Bourguignat, 1877 (360)
- Genus Amenixesta Iredale, 1941 (2)
- Genus Amphiblema Gude, 1911 accepted as Kalidos Gude, 1911
- Genus Antiquarion J. Stanisic, 2010 (8)
- Genus Ariocaelatura Germain, 1921 accepted as Plegma Gude, 1911
- Genus Attenborougharion Hyman & Köhler, 2017 (1)
- Genus Aulacopus Pfeffer, 1878 accepted as Orpiella J. E. Gray, 1855
- Genus Bathia G. C. Robson, 1914 (1)
- Genus Brevisentis Hyman, 2007 (3)
- Genus Burnettia J. Stanisic, 2010 (2)
- Genus Caelatura auctt. accepted as Coelatura L. Pfeiffer, 1877
- Genus Caldwellia H. Adams, 1873 (5)
- Genus Chalepotaxis Ancey, 1887 (2)
- Genus Coelatura L. Pfeiffer, 1877 accepted as Plegma Gude, 1911
- Genus Colmanarion J. Stanisic, 2010 (2)
- Genus Ctenoglypta Ancey, 1904 (1)
- Genus Ctenophila Ancey, 1882 (6)
- Genus Cucullarion J. Stanisic, 1998 (2)
- Genus Cycliscus Gude, 1911 accepted as Harmogenanina Germain, 1918
- Genus Dancea Zilch, 1960 (3)
- Genus Delinitesta Iredale, 1933 (1)
- Genus Dendronitor Iredale, 1933 (1)
- Genus Desidarion Iredale, 1941 accepted as Parmavitrina Iredale, 1937
- Genus Dimidarion J. Stanisic, 2010 accepted as Fastosarion Iredale, 1933
- Genus Dupontia Godwin-Austen, 1908 (9)
- Genus Echonitor Iredale, 1937 (3)
- Genus Eddiella J. Stanisic, 2010 (4)
- Genus Einasleighana J. Stanisic, 2010 (2)
- Genus Elatonitor J. Stanisic, 2010 (2)
- Genus Ellarion Iredale, 1941 (1)
- Genus Epiglypta Pilsbry, 1893 (1)
- Genus Erepta Albers, 1850 (7)
- Genus Eufretum H. B. Baker, 1941 (3)
- Genus Eungarion J. Stanisic, 1993 accepted as Fastosarion Iredale, 1933
- Genus Expocystis Iredale, 1937 (6)
- Genus Fastosarion Iredale, 1933 (21)
- Genus Fenestrarion J. Stanisic, 2010 (1)
- Genus Fijia Gude, 1913 (2)
- Genus Geminitor Hyman & Köhler, 2022 (5)
- Genus Gudeoconcha Iredale, 1944 (1)
- Genus Harmogenanina Germain, 1918 (6)
- Genus Helecarion A. Férussac, 1821 accepted as Helicarion A. Férussac, 1821
- Genus Helicarion A. Férussac, 1821 (8)
- Genus Howearion Iredale, 1944 (2)
- Genus Hunsteinia Iredale, 1941 accepted as Zagmena Iredale, 1941
- Genus Hymanarion J. Stanisic, 2010 accepted as Fastosarion Iredale, 1933
- Genus Irenella Gude, 1913 (5)
- Genus Kalidos Gude, 1911 (121)
- Species Kalidos acutus Fischer-Piette & Salvat, 1966 accepted as Sitala acuta (Fischer-Piette & Salvat, 1966)
- Species Kalidos aequivocus (G. C. Robson, 1914)
- Species Kalidos ambatoensis K. C. Emberton & O. L. Griffiths, 2009
- Species Kalidos ambilensis Fischer-Piette & Bedoucha, 1966
- Species Kalidos ambrae K. C. Emberton, 2007
- Species Kalidos amicus Fischer-Piette, F. Blanc & Salvat, 1975
- Species Kalidos analamerae K. C. Emberton, 2007
- Species Kalidos anceyianus Fischer-Piette & Salvat, 1966
- Species Kalidos andapaensis Fischer-Piette, F. Blanc & Salvat, 1975
- Species Kalidos angulorchidus K. C. Emberton, 2007
- Species Kalidos anobrachis (Dohrn, 1882)
- Species Kalidos antsepokensis Fischer-Piette, F. Blanc & Vukadinovic, 1974
- Species Kalidos avanalamerae K. C. Emberton, 2007
- Species Kalidos balstoni (Angas, 1877)
- Species Kalidos bathensis (G. C. Robson, 1914)
- Species Kalidos bathiei (Fischer-Piette & Salvat, 1965)
- Species Kalidos beambrae K. C. Emberton, 2007
- Species Kalidos benardi Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos betsaratae K. C. Emberton, 2007
- Species Kalidos boriambrae K. C. Emberton, 2007
- Species Kalidos bournei G. C. Robson, 1914
- Species Kalidos briandi Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos cachani Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos calculus Fischer-Piette & Bedoucha, 1966
- Species Kalidos capdambrae K. C. Emberton, 2007
- Species Kalidos capestensis K. C. Emberton & O. L. Griffiths, 2009
- Species Kalidos capuroni Fischer-Piette, F. Blanc & Salvat, 1975
- Species Kalidos chastellii (A. Férussac, 1832)
- Species Kalidos cleamesi (E. A. Smith, 1882)
- Species Kalidos conorchidus K. C. Emberton, 2007
- Species Kalidos culminis Fischer-Piette & Salvat, 1966 accepted as Sitala culminis (Fischer-Piette & Salvat, 1966)
- Species Kalidos dautzenbergianus (Ancey, 1902)
- Species Kalidos decaryi Fischer-Piette, F. Blanc & Salvat, 1975
- Species Kalidos delphini Fischer-Piette, F. Blanc & Vukadinovic, 1974 accepted as Sitala delphini (Fischer-Piette, F. Blanc & Vukadinovic, 1974)
- Species Kalidos dupuyi Verdcourt, 2006
- Species Kalidos ekongensis (Angas, 1877)
- Species Kalidos elevatus Fischer-Piette & Salvat, 1966 accepted as Sitala elevata (Fischer-Piette & Salvat, 1966)
- Species Kalidos eos (Dohrn, 1882)
- Species Kalidos etiambrae K. C. Emberton, 2007
- Species Kalidos eucharis (Deshayes, 1850)
- Species Kalidos fallax Fischer-Piette, F. Blanc & Salvat, 1975
- Species Kalidos feneriffensis (H. Adams & Angas, 1876)
- Species Kalidos fenni K. C. Emberton & Pearce, 2000
- Species Kalidos fisakambrae K. C. Emberton, 2007
- Species Kalidos fisakus K. C. Emberton, 2007
- Species Kalidos foitra K. C. Emberton, 2007
- Species Kalidos fuscoluteus (Grateloup, 1840)
- Species Kalidos gallorum K. C. Emberton, 2007
- Species Kalidos galokoae K. C. Emberton, 2007
- Species Kalidos germodi Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos gervaisi Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos ginoi (Falconieri, 1995)
- Species Kalidos glessi Fischer-Piette, F. Blanc & Salvat, 1975
- Species Kalidos globosus K. C. Emberton, 2007
- Species Kalidos gora K. C. Emberton, Slapcinsky, C. A. Campbell, Rakotondrazafy, Andriamiarison & J. D. Emberton, 2010
- Species Kalidos granosculptus (Ancey, 1902)
- Species Kalidos griffithshauchleri K. C. Emberton, 2002
- Species Kalidos guernesti Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos helleri Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos hildebrandti (Dohrn, 1882)
- Species Kalidos hova (Odhner, 1919)
- Species Kalidos huberi Thach, 2018
- Species Kalidos humbloti (Ancey, 1902)
- Species Kalidos josephinae K. C. Emberton & O. L. Griffiths, 2009
- Species Kalidos ketronambrae K. C. Emberton, 2007
- Species Kalidos kosugei Falconieri, 1995
- Species Kalidos lamenni Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos lamyi Fischer-Piette & Bedoucha, 1966
- Species Kalidos lapillus Fischer-Piette & Bedoucha, 1966
- Species Kalidos liardi Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos loucoubeensis Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos luroni Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos mahafatifaty J. Gerlach, O. L. Griffiths & Slapcinsky, 2023
- Species Kalidos mandamus K. C. Emberton, 2007
- Species Kalidos mangokyanus (Fischer-Piette & Salvat, 1965)
- Species Kalidos manotrika K. C. Emberton, Slapcinsky, C. A. Campbell, Rakotondrazafy, Andriamiarison & J. D. Emberton, 2010
- Species Kalidos manta K. C. Emberton, Slapcinsky, C. A. Campbell, Rakotondrazafy, Andriamiarison & J. D. Emberton, 2010
- Species Kalidos manumboensis K. C. Emberton, 1994
- Species Kalidos marojezianus Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos maryannae O. L. Griffiths & D. G. Herbert, 2013
- Species Kalidos matoatoa K. C. Emberton, 2007
- Species Kalidos menani Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos merschardti Fischer-Piette, F. Blanc & Salvat, 1975
- Species Kalidos microlamyi Fischer-Piette, F. Blanc & Vukadinovic, 1974
- Species Kalidos milloti Fischer-Piette & Salvat, 1966
- Species Kalidos minangulorchidus K. C. Emberton, 2007
- Species Kalidos minorchidus K. C. Emberton, 2007
- Species Kalidos montis Fischer-Piette & Bedoucha, 1966
- Species Kalidos morambrae K. C. Emberton, 2007
- Species Kalidos namorokae K. C. Emberton, 2007
- Species Kalidos narindana J. Gerlach, O. L. Griffiths & Slapcinsky, 2023 accepted as Kalidos narindanus J. Gerlach, O. L. Griffiths & Slapcinsky, 2023
- Species Kalidos narindanus J. Gerlach, O. L. Griffiths & Slapcinsky, 2023
- Species Kalidos nelamni Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos oleatus (Ancey, 1902)
- Species Kalidos orchidus K. C. Emberton, 2007
- Species Kalidos oxyacme (Ancey, 1902)
- Species Kalidos pendutsaratae K. C. Emberton, 2007
- Species Kalidos piperatus (Fulton, 1901)
- Species Kalidos platorchidus K. C. Emberton, 2007
- Species Kalidos prenanti Fischer-Piette, C. P. Blanc, F. Blanc & Salvat, 1994
- Species Kalidos profugus (Ancey, 1902)
- Species Kalidos prominens Fischer-Piette & Salvat, 1966
- Species Kalidos propeanobrachis Fischer-Piette & Bedoucha, 1966
- Species Kalidos prunelli Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos quadrangulata J. Gerlach, O. L. Griffiths & Slapcinsky, 2023 accepted as Kalidos quadrangulatus J. Gerlach, O. L. Griffiths & Slapcinsky, 2023
- Species Kalidos quadrangulatus J. Gerlach, O. L. Griffiths & Slapcinsky, 2023
- Species Kalidos ramesi Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos richardi K. C. Emberton & Pearce, 2000
- Species Kalidos rioui Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos rudolfi Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos rufescens (Grateloup, 1840)
- Species Kalidos secans Fischer-Piette, F. Blanc & Salvat, 1975
- Species Kalidos severini Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos striaspiralis K. C. Emberton & Pearce, 2000
- Species Kalidos suarezensis (Dautzenberg, 1895)
- Species Kalidos tenebricus Fischer-Piette, F. Blanc & Salvat, 1975 accepted as Kalidos anceyianus Fischer-Piette & Salvat, 1966
- Species Kalidos ternieri Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos thalia (Dohrn, 1882)
- Species Kalidos toisuarezensis K. C. Emberton, 2007
- Species Kalidos torfani Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1994
- Species Kalidos tranomarensis Fischer-Piette, F. Blanc & Vukadinovic, 1974
- Species Kalidos tsarabe K. C. Emberton & O. L. Griffiths, 2009
- Species Kalidos tsaratae K. C. Emberton, 2007
- Species Kalidos tsaratananensis Fischer-Piette & Salvat, 1966
- Species Kalidos tsialangiensis Fischer-Piette, F. Blanc & Vukadinovic, 1974
- Species Kalidos tulearensis Fischer-Piette & Salvat, 1966 accepted as Trochonanina tulearensis (Fischer-Piette & Salvat, 1966)
- Species Kalidos unistriata J. Gerlach, O. L. Griffiths & Slapcinsky, 2023 accepted as Kalidos unistriatus J. Gerlach, O. L. Griffiths & Slapcinsky, 2023
- Species Kalidos unistriatus J. Gerlach, O. L. Griffiths & Slapcinsky, 2023
- Species Kalidos vasihae K. C. Emberton & Pearce, 2000
- Species Kalidos vavaboriborius K. C. Emberton, 2007
- Species Kalidos zahamenensis Fischer-Piette, C. P. Blanc, F. Blanc & Salvat, 1994
- Genus Laconia J. E. Gray, 1855 accepted as Helicarion A. Férussac, 1821
- Genus Laocaia Kuzminykh, 1999 (3)
- Genus Levidens Hyman, 2007 (1)
- Genus Limpidarion Hyman & Köhler, 2020 (1)
- Genus Luinarion Iredale, 1933 accepted as Helicarion A. Férussac, 1821
- Genus Macularion J. Stanisic, 2010 accepted as Stanisicarion Hyman & Ponder, 2010
- Genus Malandena Iredale, 1933 accepted as Elatonitor J. Stanisic, 2010
- Genus Melocystis Iredale, 1937 accepted as Nitor Gude, 1911
- Genus Methuenia accepted as Methvenia G. C. Robson, 1914
- Genus Methvenia G. C. Robson, 1914 accepted as Kalidos Gude, 1911
- Genus Microstylodonta Germain, 1921 accepted as Erepta Albers, 1850
- Genus Mistarion Iredale, 1941 (1)
- Genus Modonitor Iredale, 1937 accepted as Nitor Gude, 1911
- Genus Montanocystis J. Stanisic, 2010 (1)
- Genus Mysticarion Iredale, 1941 (4)
- Genus Nesonanina C. R. Boettger, 1918 (1)
- Genus Nitor Gude, 1911 (12)
- Genus Owaraha H. B. Baker, 1941 represented as Orpiella (Owaraha) H. B. Baker, 1941
- Genus Pachystyla Mörch, 1852 (3)
- Genus Palmervillea J. Stanisic, 2010 (1)
- Genus Parmacochlea E. A. Smith, 1884 (4)
- Genus Parmavitrina Iredale, 1937 (6)
- Genus Parmella H. Adams, 1867 (1)
- Genus Parmellops Iredale, 1944 (2)
- Genus Peloparion Iredale, 1937 (1)
- Genus Periclocystis Iredale, 1937 (1)
- Genus Petalochlamys Godwin-Austen, 1907 (3)
- Genus Plegma Gude, 1911 (2)
- Genus Pravonitor Iredale, 1937 (8)
- Genus Propebloyetia Germain, 1913 accepted as Kalidos Gude, 1911
- Genus Pseudocaelatura Wenz, 1947 accepted as Dancea Zilch, 1960
- Genus Pseudophasis Germain, 1918 (1)
- Genus Pseudosaphtia de Winter, 2008 (1)
- Genus Pseudosesara Solem, 1962 (1)
- Genus Quirosella Clench, 1958 (3)
- Genus Rotula Albers, 1850 accepted as Harmogenanina Germain, 1918
- Genus Saphtia de Winter, 2008 (3)
- Genus Sheaia Hyman, 2007 (1)
- Genus Sigaloeista Shea & O. L. Griffiths, 2010 (7)
- Genus Sitalarion H. B. Baker, 1941 (1)
- Genus Stanisicarion Hyman & Ponder, 2010 (3)
- Genus Sundavitrina B. Rensch, 1932 accepted as Vitrinopsis C. Semper, 1873
- Genus Suterella Iredale, 1915 accepted as Oxychilus Fitzinger, 1833
- Genus Tachyphasis Germain, 1918 accepted as Ctenophila Ancey, 1882
- Genus Taiwanosiphona T. Habe, 1943 accepted as Chalepotaxis Ancey, 1887
- Genus Tarocystis Iredale, 1937 (8)
- Genus Thalassia E. von Martens, 1860 accepted as Nitor Gude, 1911
- Genus Thularion J. Stanisic, 1993 (2)
- Genus Torrecystis J. Stanisic, 2010 (1)
- Genus Tropicystis J. Stanisic, 2010 (1)
- Genus Urazirochlamys T. Habe, 1946 (1)
- Genus Vanmolia de Winter, 2008 (1)
- Genus Vercularion Iredale, 1933 accepted as Fastosarion Iredale, 1933
- Genus Westracystis Iredale, 1939 (2)
- Genus Zagmena Iredale, 1941 (17)
- 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 (365)
- 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 (1 581)
- 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
