Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 433)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 105)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 569)
- 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)
- Suborder Euthecosomata (328)
- Superfamily Cavolinioidea J. E. Gray, 1850 (1815) (227)
- Family Cavoliniidae J. E. Gray, 1850 (1815) (102)
- Family Cleodoridae J. E. Gray, 1840 accepted as Cavoliniidae J. E. Gray, 1850 (1815)
- Family Cliidae Jeffreys, 1869 (53)
- Genus Balantium Children, 1823 accepted as Clio (Balantium) Children, 1823
- Genus Chaduma Korobkov, 1966 † accepted as Clio Linnaeus, 1767 (1)
- Genus Cleodora F. Péron & Lesueur, 1810 accepted as Clio Linnaeus, 1767
- Genus Clio Linnaeus, 1767 (52)
- Subgenus Clio (Balantium) Children, 1823 represented as Clio Linnaeus, 1767
- Subgenus Clio (Bellardiclio) A. W. Janssen, 2004 represented as Clio Linnaeus, 1767
- Subgenus Clio (Clio) Linnaeus, 1767 represented as Clio Linnaeus, 1767
- Subgenus Clio (Creseis) Rang, 1828 accepted as Creseis Rang, 1828
- Subgenus Clio (Nudiclio) Korobkov, 1966 † accepted as Clio Linnaeus, 1767
- Species Clio aichinoi Checchia-Rispoli, 1921 †
- Species Clio andreae (Boas, 1886)
- Species Clio antarctica Dall, 1908 accepted as Clio pyramidata antarctica Dall, 1908
- Species Clio asphaltodes Beets, 1943 † accepted as Diacria mbaensis Ladd, 1934 †
- Species Clio australis Bruguière, 1792 accepted as Clione limacina australis (Bruguière, 1792)
- Species Clio balantium (Rang, 1834) accepted as Clio recurva (Children, 1823)
- Species Clio bellardii Audenino, 1895 †
- Species Clio berglundi Squires, 1989 † accepted as Clio berglundorum Squires, 1989 †
- Species Clio berglundorum Squires, 1989 †
- Species Clio blinkae A. W. Janssen, 1989 †
- Species Clio borealis (Pallas, 1774) accepted as Clione limacina (Phipps, 1774)
- Species Clio braidensis (Bellardi, 1873) †
- Species Clio calix (Bellardi, 1873) †
- Species Clio campylura (Tesch, 1948)
- Species Clio caralitana Robba & Spano, 1978 † accepted as Clio sulcosa (Bellardi, 1873) †
- Species Clio carinata Audenino, 1895 †
- Species Clio caudata Linnaeus, 1767 accepted as Clio pyramidata Linnaeus, 1767
- Species Clio chadumica Korobkov, 1966 †
- Species Clio chaptalii Gray, 1850
- Species Clio colina A. W. Janssen & Zorn, 2001 †
- Species Clio convexa (Boas, 1886)
- Subspecies Clio convexa convexa (Boas, 1886)
- Subspecies Clio convexa cyphosa Rampal, 2002
- Species Clio cuspidata (Bosc, 1801)
- Species Clio distefanoi Checchia-Rispoli, 1921 †
- Species Clio falcata (Pfeffer, 1880) accepted as Clio polita Pelseneer, 1888
- Species Clio fallauxi (Kittl, 1886) †
- Species Clio flabelliforme (Blankenhorn, 1889)
- Species Clio flavescens Gegenbaur, 1855 accepted as Paraclione flavescens (Gegenbaur, 1855)
- Species Clio gailae Goedert & A. W. Janssen, 2012 †
- Species Clio garganica Sirna, 1968 † accepted as Clio distefanoi Checchia-Rispoli, 1921 †
- Species Clio ghawdexensis A. W. Janssen, 2003 †
- Species Clio giulioi A. W. Janssen, 1995 †
- Species Clio goederti Squires, 1989 † accepted as Clio goedertorum Squires, 1989 †
- Species Clio goedertorum Squires, 1989 †
- Species Clio guidottii Simonelli, 1896 †
- Species Clio hataii (H. Noda, 1972) †
- Species Clio helicina Phipps, 1774 accepted as Limacina helicina (Phipps, 1774)
- Species Clio ichishiensis (Shibata, 1983) †
- Species Clio irenae A. W. Janssen, 1989 †
- Species Clio itoigawai (Shibata, 1983) †
- Species Clio jacobae A. W. Janssen, 1989 †
- Species Clio kendacensis P. Jung, 1971 †
- Species Clio kipasiformis (Beets, 1943) † accepted as Diacria mbaensis Ladd, 1934 †
- Species Clio lavayssei Rutsch, 1934 †
- Species Clio limacina Phipps, 1774 accepted as Clione limacina (Phipps, 1774)
- Species Clio longicaudata Souleyet, 1852 accepted as Paraclione longicaudata (Souleyet, 1852)
- Species Clio lozoueti A. W. Janssen, 2010 †
- Species Clio lucai A. W. Janssen, 2000 †
- Species Clio mediterranea Gegenbaur, 1855 accepted as Cliopsis krohnii Troschel, 1854
- Species Clio merijni A. W. Janssen, 2012 †
- Species Clio miquelonensis Rang, 1825 accepted as Clione limacina (Phipps, 1774)
- Species Clio multicostata (Bellardi, 1873) †
- Species Clio nielseni A. W. Janssen, 1990 †
- Species Clio oblonga Rampal, 1997 †
- Species Clio ortheziana (Benoist, 1889) †
- Species Clio orthotheca (Tesch, 1948)
- Species Clio pauli A. W. Janssen, 1989 †
- Species Clio pedemontana (C. Mayer, 1868) †
- Species Clio piatkowskii van der Spoel, Schalk & Bleeker, 1992
- Species Clio polita Pelseneer, 1888
- Species Clio promaucana R. A. Philippi, 1887 †
- Species Clio pulcherrima (Mayer, 1868) †
- Species Clio punctata Tesch, 1903 accepted as Fowlerina punctata (Tesch, 1903)
- Species Clio pyramidata Linnaeus, 1767
- Species Clio quadrispinosa Rang, 1831 accepted as Clio cuspidata (Bosc, 1801)
- Species Clio recurva (Children, 1823)
- Species Clio retusa Linnaeus, 1767 accepted as Clio pyramidata Linnaeus, 1767
- Species Clio ricciolii (Calandrelli, 1844) †
- Species Clio saccoi Checchia-Rispoli, 1921 †
- Species Clio scheelei (Munthe, 1888)
- Species Clio shibatai Ujihara, 1996 †
- Species Clio sulcata (Pfeffer, 1879) accepted as Clio pyramidata f. sulcata (Pfeffer, 1879)
- Species Clio sulcosa (Bellardi, 1873) †
- Species Clio teschi McGowan, 1960 accepted as Clio convexa (Boas, 1886)
- Species Clio triplicata Audenino, 1895 †
- Species Clio urenuiensis Suter, 1917 † accepted as Ireneia urenuiensis (Suter, 1917) †
- Species Clio vasconiensis A. W. Janssen, 2010 †
- Species Clio vilis A. W. Janssen, 2012 †
- Species Clio vrazi Vasicek, 1949 † accepted as Vaginella austriaca Kittl, 1886 †
- Genus Euclio Bonnevie, 1913 accepted as Clio Linnaeus, 1767
- Genus Proclio Hubendick, 1951 accepted as Clio Linnaeus, 1767
- Family Clioidae Jeffreys, 1869 accepted as Cliidae Jeffreys, 1869
- Family Creseidae Rampal, 1973 (38)
- Family Cuvierinidae van der Spoel, 1967 (25)
- Family Hyalaeidae Rafinesque, 1815 accepted as Cavoliniidae J. E. Gray, 1850 (1815)
- Family Hyalocylidae A. W. Janssen, 2020 (3)
- Family Praecuvierinidae A. W. Janssen, 2006 † (3)
- Family Sphaerocinidae A. W. Janssen & P. A. Maxwell, 1995 † (3)
- Family Tripteridae Gray, 1850 accepted as Cuvierinidae van der Spoel, 1967
- Superfamily Limacinoidea Gray, 1840 (101)
- Suborder Gymnosomata (60)
- Suborder Pseudothecosomata (26)
- 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