Between brackets is the number of accepted species

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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)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 581)
- Superfamily Bulimuloidea Tryon, 1867 accepted as Orthalicoidea E. von Martens, 1860
- Superfamily Orthalicoidea E. von Martens, 1860 (1 581)
- Family Amphibulimidae P. Fischer, 1873 (109)
- Family Bothriembryontidae Iredale, 1937 (168)
- Family Bulimulidae Tryon, 1867 (942)
- Family Cyclodontinidae Salvador & Breure, 2023 (111)
- Family Liguidae Pilsbry, 1891 accepted as Orthalicidae E. von Martens, 1860
- Family Megaspiridae Pilsbry, 1904 (58)
- Family Orthalicidae E. von Martens, 1860 (108)
- Genus Aposcutalus Dutra & Leme, 1985 (1)
- Genus Chersina H. Beck, 1837 accepted as Liguus Montfort, 1810
- Genus Clathrorthalicus Strebel, 1909 (5)
- Genus Corona Albers, 1850 (8)
- Genus Hemibulimus E. von Martens, 1885 (2)
- Genus Kara Strebel, 1910 (6)
- Genus Laeorthalicus Strebel, 1909 accepted as Corona Albers, 1850
- Genus Liguellus Clench, 1946 accepted as Liguus Montfort, 1810
- Genus Liguus Montfort, 1810 (4)
- Genus Melaniorthalicus Strebel, 1909 accepted as Corona Albers, 1850
- Genus Myiorthalicus Strebel, 1909 accepted as Corona Albers, 1850
- Genus Ortalicus [sic] accepted as Orthalicus H. Beck, 1837
- Genus Orthalicinus P. Fischer & Crosse, 1875 accepted as Liguus Montfort, 1810
- Genus Orthalicus H. Beck, 1837 (40)
- Subgenus Orthalicus (Clathrortalicus) Strebel, 1909 represented as Clathrorthalicus Strebel, 1909
- Subgenus Orthalicus (Laeorthalicus) Strebel, 1909 accepted as Corona Albers, 1850
- Subgenus Orthalicus (Melaniorthalicus) Strebel, 1909 accepted as Sultana (Metorthalicus) Pilsbry, 1899
- Subgenus Orthalicus (Porphyrobaphe) Shuttleworth, 1856 accepted as Porphyrobaphe Shuttleworth, 1856
- Subgenus Orthalicus (Sultana) Shuttleworth, 1856 accepted as Sultana Shuttleworth, 1856
- Subgenus Orthalicus (Trachyorthalicus) Strebel, 1909 accepted as Sultana (Trachyorthalicus) Strebel, 1909
- Subgenus Orthalicus (Zebra) Shuttleworth, 1856 accepted as Orthalicus H. Beck, 1837
- Species Orthalicus bensoni (Reeve, 1849)
- Species Orthalicus bifulguratus (Reeve, 1849)
- Species Orthalicus boucardi L. Pfeiffer, 1860
- Species Orthalicus boucardiponderosus Strebel, 1882 accepted as Orthalicus boucardi L. Pfeiffer, 1860
- Species Orthalicus capax (Pilsbry, 1930)
- Species Orthalicus colimensis Rolle, 1895 accepted as Orthalicus elegans Rolle, 1895
- Species Orthalicus decolor Strebel, 1882
- Species Orthalicus delphinus (Strebel, 1909)
- Species Orthalicus elegans Rolle, 1895
- Species Orthalicus ferussaci E. von Martens, 1863
- Subspecies Orthalicus ferussaci ferussaci E. von Martens, 1863
- Subspecies Orthalicus ferussaci tricinctus E. von Martens, 1893
- Variety Orthalicus ferussaci var. tricinctus E. von Martens, 1893 accepted as Orthalicus ferussaci tricinctus E. von Martens, 1893
- Species Orthalicus floridensis Pilsbry, 1891
- Species Orthalicus fraseri (L. Pfeiffer, 1858) accepted as Sultana fraseri (L. Pfeiffer, 1858)
- Species Orthalicus fulvescens L. Pfeiffer, 1856
- Species Orthalicus gallina-sultana (Chemnitz, 1795) accepted as Helix sultana Dillwyn, 1817
- Species Orthalicus gruneri (Strebel, 1909) accepted as Orthalicus zebra (O. F. Müller, 1774)
- Species Orthalicus hackeri (Strebel, 1909)
- Species Orthalicus iodes Shuttleworth, 1856 accepted as Sultana atramentaria (L. Pfeiffer, 1855)
- Species Orthalicus isabellinus E. von Martens, 1873 accepted as Orthalicus bensoni (Reeve, 1849)
- Species Orthalicus leucochilus Crosse & P. Fischer, 1869
- Species Orthalicus linteus (Conrad, 1871) †
- Species Orthalicus livens Shuttleworth, 1856
- Species Orthalicus lividus E. von Martens, 1863
- Species Orthalicus lividusprinceps Strebel, 1882 accepted as Orthalicus ponderosus ponderosus Strebel, 1882
- Species Orthalicus longus L. Pfeiffer, 1856
- Species Orthalicus macandrewi G. B. Sowerby III, 1889 accepted as Sultana (Metorthalicus) macandrewi (G. B. Sowerby III, 1889)
- Species Orthalicus maclurae E. von Martens, 1893
- Species Orthalicus maculiferus (Strebel, 1909)
- Species Orthalicus maracaibensis L. Pfeiffer, 1856 accepted as Orthalicus zebra (O. F. Müller, 1774)
- Species Orthalicus mars L. Pfeiffer, 1861
- Species Orthalicus melanocheilus (Valenciennes, 1827)
- Species Orthalicus meobambensis (L. Pfeiffer, 1855) accepted as Sultana meobambensis (L. Pfeiffer, 1855)
- Species Orthalicus muelleri (Strebel, 1909)
- Species Orthalicus nobilis Rolle, 1895
- Species Orthalicus obductus Shuttleworth, 1856
- Species Orthalicus pallidus (Strebel, 1909)
- Species Orthalicus pfeifferi Hidalgo, 1869 accepted as Corona pfeifferi (Hidalgo, 1869)
- Species Orthalicus phlogerus (A. d'Orbigny, 1835)
- Species Orthalicus ponderosus Strebel, 1882
- Species Orthalicus ponderosusboucardi Strebel, 1882 accepted as Orthalicus boucardi L. Pfeiffer, 1860
- Species Orthalicus powisianus (Petit de la Saussaye, 1843) accepted as Sultana powisiana (Petit de la Saussaye, 1843)
- Species Orthalicus princeps (Broderip, 1833)
- Species Orthalicus prototypus Pilsbry, 1899
- Species Orthalicus pseudolongus (Strebel, 1909)
- Species Orthalicus pulchellus (Spix, 1827)
- Species Orthalicus quaga [sic] accepted as Orthalicus quagga (Strebel, 1909)
- Species Orthalicus quagga (Strebel, 1909)
- Species Orthalicus quagus [sic] accepted as Orthalicus quagga (Strebel, 1909)
- Species Orthalicus reginaeformis Strebel, 1909 accepted as Corona perversa (Swainson, 1821)
- Species Orthalicus reses (Say, 1830)
- Species Orthalicus richardsoni (Strebel, 1909)
- Species Orthalicus selectus (Strebel, 1909) accepted as Orthalicus undatus (Bruguière, 1789)
- Species Orthalicus sphinx (Strebel, 1909)
- Species Orthalicus sultana (Dillwyn, 1817) accepted as Sultana sultana (Dillwyn, 1817)
- Species Orthalicus tepicensis (Strebel, 1909)
- Species Orthalicus torrei (T. L. McGinty, 1939)
- Species Orthalicus tricinctus E. von Martens, 1893 accepted as Orthalicus ferussaci tricinctus E. von Martens, 1893
- Species Orthalicus trullisatus Shuttleworth, 1856 accepted as Sultana sultana (Dillwyn, 1817)
- Species Orthalicus uhdeanus E. von Martens, 1893
- Species Orthalicus undatus (Bruguière, 1789)
- Species Orthalicus varius E. von Martens, 1873
- Species Orthalicus zebra (O. F. Müller, 1774)
- Species Orthalicus zebra (O. F. Müller, 1774) sensu Strebel, 1882 accepted as Orthalicus muelleri (Strebel, 1909)
- Species Orthalicus zebra (O. F. Müller, 1774) sensu Binney & Bland, 1869 accepted as Orthalicus melanocheilus melanocheilus (Valenciennes, 1833)
- Species Orthalicus zonatus (Strebel, 1909)
- Species Orthalicus zoniferus Strebel, 1882
- Genus Oxystrombus Mörch, 1852 accepted as Liguus Montfort, 1810
- Genus Oxystyla Schlüter, 1838 accepted as Orthalicus H. Beck, 1837
- Genus Paraliguus Pilsbry, 1899 accepted as Corona Albers, 1850
- Genus Porphyrobaphe Shuttleworth, 1856 (6)
- Genus Quechua Strebel, 1910 (4)
- Genus Scholvienia Strebel, 1910 (15)
- Genus Sultana Shuttleworth, 1856 (17)
- Genus Thomsenia Strebel, 1910 accepted as Scholvienia Strebel, 1910
- Genus Zebra Shuttleworth, 1856 accepted as Orthalicus H. Beck, 1837
- 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