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)
- 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)
- Subfamily Aegistinae Kuroda & Habe, 1949 accepted as Aegistini Kuroda & Habe, 1949
- Subfamily Amphidrominae Kobelt, 1902 accepted as Camaeninae Pilsbry, 1895
- Subfamily Bradybaeninae Pilsbry, 1934 (1898) (763)
- Subfamily Camaeninae Pilsbry, 1895 (600)
- Subfamily Cristovalinae Schileyko, 2003 accepted as Hadrinae Iredale, 1937
- Subfamily Hadrinae Iredale, 1937 (1 165)
- Genus Adclarkia J. Stanisic, 1996 (3)
- Genus Aetholitis J. Stanisic, 2010 (5)
- Genus Amplirhagada Iredale, 1933 (80)
- Genus Angasella A. Adams, 1864 accepted as Pleuroxia Ancey, 1887
- Genus Angasietta Iredale, 1939 accepted as Basedowena Iredale, 1937
- Genus Ariophantopsis B. Rensch, 1930 (2)
- Genus Arnemelassa Iredale, 1933 accepted as Arnemelassa Köhler & Bouchet, 2020
- Genus Arnemelassa Köhler & Bouchet, 2020 (1)
- Genus Arnhemtrachia Köhler & Criscione, 2013 (1)
- Genus Aslintesta Solem, 1992 (1)
- Genus Australocosmica Köhler, 2011 (9)
- Genus Austrocamaena J. Stanisic, 2010 (2)
- Genus Austrochloritis Pilsbry, 1891 (34)
- Genus Baccalena Iredale, 1937 accepted as Granulomelon Iredale, 1933
- Genus Badistes Gould, 1862 accepted as Sauroconcha W.-H. Zhang & Shea, 2008
- Genus Basedowena Iredale, 1937 (19)
- Genus Baudinella Thiele, 1931 (9)
- Genus Bellrhagada Iredale, 1938 accepted as Rhagada E. von Martens, 1860
- Genus Bentosites Iredale, 1933 (6)
- Genus Billordia J. Stanisic, 2010 (2)
- Genus Boriogenia J. Stanisic, 2010 (2)
- Genus Brigaladra L. Stanisic, 2022 (1)
- Genus Calvigenia Iredale, 1938 (5)
- Genus Calycia H. Adams, 1865 (1)
- Genus Canefriula Iredale, 1941 (13)
- Genus Caperantrum Solem, 1997 (1)
- Genus Cardiotrachia Criscione & Köhler, 2014 (1)
- Genus Carinotrachia Solem, 1985 (2)
- Genus Carmerope Iredale, 1941 accepted as Papuina E. von Martens, 1860
- Genus Caroletitia Iredale, 1941 accepted as Letitia (Saccoletitia) Iredale, 1941
- Genus Catellotrachia Iredale, 1933 (25)
- Genus Chlorites [sic] accepted as Chloritis H. Beck, 1837
- Genus Chloritis H. Beck, 1837 (103)
- Genus Chloritisanax Iredale, 1933 (1)
- Genus Chloritobadistes Iredale, 1933 (1)
- Genus Claudena Iredale, 1941 accepted as Claudettea (Claudena) Iredale, 1941
- Genus Claudettea Iredale, 1941 (2)
- Genus Coliolus Tapparone Canefri, 1886 (3)
- Genus Contramelon Iredale, 1937 (1)
- Genus Cooperconcha Solem, 1992 (3)
- Genus Crikey J. Stanisic, 2009 (1)
- Genus Cristigibba Tapparone Canefri, 1883 (18)
- Genus Cristilabrum Solem, 1981 (12)
- Genus Cristovala Clench, 1958 accepted as Crystallopsis (Cristovala) Clench, 1958
- Genus Crookshanksia J. Stanisic, 2010 (1)
- Genus Crystallopsis Ancey, 1887 (20)
- Genus Cupedora Iredale, 1937 (18)
- Genus Cymotropis E. von Martens, 1860 accepted as Papuina E. von Martens, 1860 (1)
- Genus Damochlora Iredale, 1938 (1)
- Genus Denhamiana J. Stanisic, 2013 (2)
- Species Denhamiana laetifica J. Stanisic, 2013
- Species Denhamiana leichhardti J. Stanisic, 2013
- Genus Dirutrachia Iredale, 1937 (3)
- Genus Discomelon Iredale, 1938 (1)
- Genus Divellomelon Iredale, 1933 (1)
- Genus Emiralena Iredale, 1941 accepted as Megalacron I. Rensch, 1934
- Genus Eugenia Albers, 1860 accepted as Papuina E. von Martens, 1860
- Genus Euryladra L. Stanisic, 2022 (1)
- Genus Eurytrachia J. Stanisic, 2010 (2)
- Genus Eustomopsis Gude, 1906 accepted as Chloritis (Eustomopsis) Gude, 1906
- Genus Exiligada Iredale, 1939 (15)
- Genus Eximiorhagada Iredale, 1933 accepted as Glyptorhagada Pilsbry, 1890
- Genus Falspleuroxia Solem, 1997 (1)
- Genus Fatulabia Iredale, 1937 accepted as Basedowena Iredale, 1937
- Genus Figuladra Iredale, 1933 accepted as Figuladra Köhler & Bouchet, 2020
- Genus Figuladra Köhler & Bouchet, 2020 (15)
- Genus Forcartia Clench & R. D. Turner, 1963 (2)
- Genus Forrestena J. Stanisic, 2010 (1)
- Genus Galadistes Iredale, 1938 (11)
- Genus Gantomia Iredale, 1939 accepted as Pleuroxia Ancey, 1887
- Genus Globorhagada Iredale, 1933 (7)
- Genus Glomerata I. Rensch, 1934 accepted as Megalacron I. Rensch, 1934
- Genus Gloreugenia Iredale, 1933 (2)
- Genus Glyptorhagada Pilsbry, 1890 (11)
- Genus Gnarosophia Iredale, 1933 (1)
- Genus Granulomelon Iredale, 1933 (3)
- Genus Hadra E. von Martens, 1860 (7)
- Genus Henga Iredale, 1941 accepted as Rhynchotrochus Möllendorff, 1895
- Genus Hombronula Iredale, 1941 accepted as Papustyla Pilsbry, 1893
- Genus Insularia Tapparone Canefri, 1883 accepted as Papuina E. von Martens, 1860
- Genus Jacksonena Iredale, 1937 (1)
- Genus Jimbouria J. Stanisic, 2010 (2)
- Genus Kandoschloritis Shea & O. L. Griffiths, 2010 (1)
- Genus Kathadena Iredale, 1941 accepted as Rhynchotrochus Möllendorff, 1895
- Genus Kendrickia Solem, 1985 (1)
- Genus Kimberleydiscus Köhler, 2010 (1)
- Genus Kimberleymelon Köhler, 2010 (1)
- Genus Kimberleytrachia Köhler, 2011 (18)
- Genus Kimboraga Iredale, 1939 (8)
- Genus Kymatobaudinia Criscione & Köhler, 2013 (1)
- Genus Lacustrelix Iredale, 1937 (3)
- Genus Lamprellia J. Stanisic, 2010 (2)
- Genus Letitia Iredale, 1941 (14)
- Genus Lisprelia Iredale, 1941 accepted as Megalacron I. Rensch, 1934
- Genus Lorelliana J. Stanisic, 2016 (1)
- Genus Lullicola Iredale, 1941 accepted as Megalacron I. Rensch, 1934
- Genus Lynfergusonia J. Stanisic, 2010 (2)
- Genus Marilynessa J. Stanisic, 2010 (5)
- Genus Medistoma Iredale, 1941 accepted as Canefriula Iredale, 1941
- Genus Megalacron I. Rensch, 1934 (26)
- Genus Meliobba Iredale, 1940 (6)
- Genus Melostrachia Solem, 1979 accepted as Melostrachia Iredale, 1938
- Genus Melostrachia Iredale, 1938 (2)
- Genus Meridistes J. Stanisic, 2010 (1)
- Genus Meridolum Iredale, 1933 accepted as Sauroconcha W.-H. Zhang & Shea, 2008
- Genus Meridolum Iredale, 1942 accepted as Sauroconcha W.-H. Zhang & Shea, 2008
- Genus Merope E. von Martens, 1860 accepted as Solmotella Iredale, 1941
- Genus Mesodontrachia Solem, 1985 (1)
- Genus Micromelon Solem, 1992 (1)
- Genus Minacispira Iredale, 1941 accepted as Planispira H. Beck, 1837
- Genus Minimelon Solem, 1993 accepted as Basedowena Iredale, 1937
- Genus Molema Köhler, 2011 (2)
- Genus Molmerope Iredale, 1941 accepted as Papuina E. von Martens, 1860
- Genus Montanomelon Solem, 1993 (1)
- Genus Monteithosites J. Stanisic, 1996 (1)
- Genus Moretonistes J. Stanisic, 2010 (1)
- Genus Mouldingia Solem, 1984 (1)
- Genus Municeps Iredale, 1941 accepted as Papuina (Municeps) Iredale, 1941
- Genus Mussonena Iredale, 1938 (6)
- Genus Nannochlora Criscione & Köhler, 2015 (1)
- Genus Nannochloritis Iredale, 1938 accepted as Nannochloritis Köhler & Bouchet, 2020
- Genus Nannochloritis Köhler & Bouchet, 2020 (2)
- Genus Nanotrachia Köhler & Criscione, 2013 (6)
- Genus Negotobba Iredale, 1941 accepted as Meliobba Iredale, 1940
- Genus Neveritis Iredale, 1938 (4)
- Genus Ningbingia Solem, 1981 (6)
- Genus Noctepuna Iredale, 1933 (4)
- Genus Nodulabium Criscione & Köhler, 2013 (1)
- Genus Notobadistes Cotton & Godfrey, 1932 accepted as Sinumelon Iredale, 1930
- Genus Obstengenia B. J. Smith, 1992 accepted as Obsteugenia Iredale, 1933
- Genus Obsteugenia Iredale, 1933 (1)
- Genus Offachloritis Iredale, 1933 (2)
- Genus Ordtrachia Solem, 1984 (4)
- Genus Ototrachia Criscione & Köhler, 2013 (1)
- Genus Pallidelix Iredale, 1933 (13)
- Genus Papuexul Iredale, 1933 (1)
- Genus Papuina E. von Martens, 1860 (86)
- Genus Papuolus Schileyko, 2003 (1)
- Genus Papustyla Pilsbry, 1893 (7)
- Genus Parachloritis Ehrmann, 1912 (20)
- Genus Parglogenia Iredale, 1938 (2)
- Genus Parrhagada Iredale, 1938 accepted as Westraltrachia Iredale, 1933
- Genus Patrubella Iredale, 1938 (1)
- Genus Paulodorra Iredale, 1941 accepted as Canefriula Iredale, 1941
- Genus Perioinsolita J. Stanisic & Potter, 2010 (1)
- Genus Petraconcha S. A. Clark, 2009 (1)
- Genus Phrenegibba Iredale, 1941 accepted as Pseudopapuina F. Haas, 1934
- Genus Pinnadena Iredale, 1941 accepted as Megalacron I. Rensch, 1934
- Genus Planispira H. Beck, 1837 (39)
- Genus Plectorhagada Iredale, 1933 (7)
- Genus Pleuroxia Ancey, 1887 (6)
- Genus Pommerhelix S. A. Clark, 2009 (8)
- Genus Pompalabia Iredale, 1941 accepted as Rhynchotrochus (Pompalabia) Iredale, 1941
- Genus Ponderconcha S. A. Clark, 2009 (6)
- Genus Posorites Iredale, 1933 (3)
- Genus Promonturconchum Solem, 1997 (1)
- Genus Protolinitis J. Stanisic, 2010 (2)
- Genus Prototrachia Solem, 1984 (1)
- Genus Prymnbriareus Solem, 1981 (1)
- Genus Pseudcupedora Solem, 1992 (1)
- Genus Pseudodistes J. Stanisic & Potter, 2010 (2)
- Genus Pseudomesodontrachia Criscione & Köhler, 2013 (1)
- Genus Pseudopapuina F. Haas, 1934 (1)
- Genus Quirosena Iredale, 1941 (2)
- Genus Quistrachia Iredale, 1939 (9)
- Genus Rachita Criscione & Köhler, 2014 (1)
- Genus Ramogenia Iredale, 1938 (1)
- Genus Retroterra Solem, 1985 (8)
- Genus Rhagada E. von Martens, 1860 (38)
- Genus Rhynchotrochus Möllendorff, 1895 (21)
- Genus Sauroconcha W.-H. Zhang & Shea, 2008 (9)
- Genus Setobaudinia Iredale, 1933 (31)
- Genus Setocallosa Criscione & Köhler, 2015 (1)
- Genus Sinumelon Iredale, 1930 (32)
- Genus Smeatonia Iredale, 1941 accepted as Papuina (Smeatonia) Iredale, 1941
- Genus Solmodora Iredale, 1941 accepted as Tepomusa Iredale, 1941
- Genus Solmogada Iredale, 1941
- Genus Solmopesta Iredale, 1941 accepted as Papuina (Solmopesta) Iredale, 1941
- Genus Solmopina Iredale, 1941 accepted as Megalacron I. Rensch, 1934
- Genus Solmotella Iredale, 1941 accepted as Papuina (Solmotella) Iredale, 1941
- Genus Sphaerospira Mörch, 1867 (11)
- Genus Spurlingia Iredale, 1933 (9)
- Genus Squamagenia J. Stanisic & Potter, 2010 (2)
- Genus Stanisicia S. A. Clark, 2009 (1)
- Genus Steorra J. Stanisic, 2010 (12)
- Genus Strepsitaurus Solem, 1997 (7)
- Genus Succochlea Criscione & Köhler, 2014 (1)
- Genus Sulcobasis Tapparone Canefri, 1883 (15)
- Genus Tatemelon Solem, 1993 (4)
- Genus Temporena Iredale, 1933 (3)
- Genus Tenuigada Iredale, 1939 accepted as Amplirhagada Iredale, 1933
- Genus Tepomusa Iredale, 1941 accepted as Papuina (Tepomusa) Iredale, 1941
- Genus Thersites L. Pfeiffer, 1855 (4)
- Genus Thetagada Iredale, 1939 accepted as Amplirhagada Iredale, 1933
- Genus Tolgachloritis Iredale, 1933 (4)
- Genus Toombatrachia J. Stanisic, 2010 (1)
- Genus Torresitrachia Iredale, 1939 (28)
- Genus Trachiopsis Pilsbry, 1893 (6)
- Genus Trachygenia J. Stanisic, 2010 (4)
- Genus Trozena Iredale, 1938 (1)
- Genus Tumegada Iredale, 1939 accepted as Rhagada E. von Martens, 1860
- Genus Turgenitubulus Solem, 1981 (8)
- Genus Ventopelita Iredale, 1933 (1)
- Genus Vidumelon Iredale, 1933 (1)
- Genus Vincentrachia Criscione & Köhler, 2013 (2)
- Genus Violenga Iredale, 1941 accepted as Rhynchotrochus Möllendorff, 1895
- Genus Wahgia Clench & R. D. Turner, 1959 (1)
- Genus Westraltrachia Iredale, 1933 (20)
- Genus Xanthomelon E. von Martens, 1860 (12)
- Genus Xeromelon Criscione & Köhler, 2016 (1)
- Genus Youwanjela Köhler & Shea, 2012 (1)
- Genus Zenolina Iredale, 1941 accepted as Letitia Iredale, 1941
- Genus Zetemina Iredale, 1941 accepted as Papuina E. von Martens, 1860
- Genus Zyghelix Iredale, 1937 (1)
- Genus Zygotrachia Iredale, 1939 accepted as Westraltrachia Iredale, 1933
- Subfamily Helicostylinae Ihering, 1909 (1890) (343)
- Subfamily Papuininae Iredale, 1938 accepted as Hadrinae Iredale, 1937
- Subfamily Pfeifferiinae Gray, 1855 accepted as Helicostylinae Ihering, 1909 (1890)
- Subfamily Sinumeloninae Solem, 1992 accepted as Hadrinae Iredale, 1937
- Subfamily Xanthomelontinae Iredale, 1937 accepted as Hadrinae Iredale, 1937
- Genus Amphicoelina F. Haas, 1933 accepted as Amphicoelina Zilch, 1960
- Genus Archaeoxesta Kobelt, 1909 † (1)
- Genus Geotrochus Swainson, 1840 accepted as Helix (Papuina) E. von Martens, 1860
- Genus Gracillinoconcha W. Yü & X.-Q. Zhang, 1982 † (1)
- Genus Hodopoeus Pilsbry & T. D. A. Cockerell, 1945 † (2)
- Genus Iforasia J.-C. Fischer, 1963 † (1)
- Genus Indocamaena Thach, 2023 (2)
- Genus Kanabohelix Pilsbry, 1927 † (1)
- Genus Kenyirus Clements & Tan, 2012 (3)
- Genus Limonohelix W. Yü & X.-Q. Zhang, 1982 † (3)
- Genus Miocenehadra T. Habe & Itoigawa, 1976 † (2)
- Genus Multiscapta W. Yü, 1982 † (3)
- Genus Ogeramua Christensen, 2017 (2)
- Genus Papuanella Clench & R. D. Turner, 1959 accepted as Ogeramua Christensen, 2017
- Genus Philbouchetia Thach, 2020 (1)
- Genus Planodoma W. Yü & H.-Z. Pan, 1982 † (1)
- Genus Sanshuispira W. Yü & X.-Q. Zhang, 1982 † (3)
- Genus Sinocamaena M. Wu, 2024 (1)
- 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)
- 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
