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)
- Superorder Nudipleura (2 748)
- Order Notaspidea accepted as Pleurobranchomorpha
- Order Nudibranchia (2 651)
- Suborder Aeolidina accepted as Cladobranchia
- Suborder Anthobranchia accepted as Doridina
- Suborder Cladobranchia (1 092)
- Infraorder Pseudoeuctenidiacea accepted as Doridoxoidea Bergh, 1899
- Parvorder Aeolidida accepted as Aeolidioidea Gray, 1827
- Parvorder Dendronotida accepted as Dendronotoidea Allman, 1845
- Parvorder Dendronotina accepted as Dendronotoidea Allman, 1845
- Parvorder Euarminida accepted as Arminoidea Iredale & O'Donoghue, 1923 (1841)
- Section Acleioprocta accepted as Fionoidea Gray, 1857
- Section Cleioprocta accepted as Aeolidioidea Gray, 1827
- Section Pleuroprocta accepted as Flabellinoidea Bergh, 1889
- Superfamily Aeolidiacea accepted as Aeolidioidea Gray, 1827
- Superfamily Aeolidioidea Gray, 1827 (338)
- Family Aeolidiidae Gray, 1827 (90)
- Family Babainidae Roller, 1972 accepted as Babakinidae Roller, 1973
- Family Babakinidae Roller, 1973 (4)
- Family Caloriidae Odhner, 1968 accepted as Facelinidae Bergh, 1889
- Family Cratenidae Bergh, 1889 accepted as Facelinidae Bergh, 1889
- Family Facelinidae Bergh, 1889 (143)
- Subfamily Babakininae Roller, 1973 accepted as Babakinidae Roller, 1973
- Subfamily Crateninae Bergh, 1889
- Subfamily Facalaninae Er. Marcus, 1958 accepted as Favorininae Bergh, 1889
- Subfamily Facelininae Bergh, 1889
- Subfamily Favorininae Bergh, 1889
- Subfamily Herviellinae Burn, 1967
- Subfamily Pruvotfoliinae J. Tardy, 1970 accepted as Facelininae Bergh, 1889
- Subfamily Pteraeolidiinae Risbec, 1953 (3)
- Subfamily Rizzoliinae Odhner, 1939 accepted as Crateninae Bergh, 1889
- Genus Acanthopsole Trinchese, 1874 accepted as Facelina Alder & Hancock, 1855 (1)
- Genus Adfacelina Millen & Hermosillo, 2012 (1)
- Genus Algarvia García-Gómez & Cervera, 1990 (1)
- Genus Amanda Macnae, 1954 (1)
- Genus Anetarca Gosliner, 1991 (3)
- Genus Antonietta Schmekel, 1966 (2)
- Genus Austraeolis Burn, 1962 (4)
- Genus Bajaeolis Gosliner & Behrens, 1986 (1)
- Genus Burnaia M. C. Miller, 2001 (1)
- Genus Caloria Trinchese, 1888 (6)
- Genus Cavolina Bruguière, 1791
- Genus Cratena Bergh, 1864 (11)
- Genus Dicata Schmekel, 1967 (1)
- Genus Echinopsole Macnae, 1954 (2)
- Genus Emarcusia Roller, 1972 (1)
- Genus Ennoia Bergh, 1896 accepted as Phyllodesmium Ehrenberg, 1831
- Genus Facalana Bergh, 1888
- Species Facalana lamyi Risbec, 1937
- Species Facalana pallida Bergh, 1888
- Genus Facelina Alder & Hancock, 1855 (24)
- Genus Facelinella Pruvot-Fol, 1951 accepted as Facelinopsis Pruvot-Fol, 1954
- Genus Facelinella Baba, 1949 accepted as Facelina Alder & Hancock, 1855
- Genus Facelinopsis Pruvot-Fol, 1954 (2)
- Genus Favorinus J. E. Gray, 1850 (13)
- Genus Globiferina Risbec, 1937
- Genus Hermosita Gosliner & Behrens, 1986 (2)
- Genus Hervia Bergh, 1871 accepted as Facelina Alder & Hancock, 1855 (1)
- Genus Herviella Baba, 1949 (10)
- Genus Janssonius Ortea & Moro, 2022 (1)
- Genus Jason M. C. Miller, 1974 (1)
- Genus Learchis Bergh, 1896 (3)
- Genus Matharena Bergh, 1871 accepted as Favorinus J. E. Gray, 1850
- Genus Montagua J. Fleming, 1822 accepted as Facelina Alder & Hancock, 1855
- Genus Moridilla Bergh, 1888 (5)
- Genus Muessa Er. Marcus, 1965 accepted as Herviella Baba, 1949
- Genus Myja Bergh, 1896 (3)
- Genus Myrrhine Bergh, 1905 accepted as Phyllodesmium Ehrenberg, 1831
- Genus Noumeaella Risbec, 1937 (7)
- Genus Palisa Edmunds, 1964 (1)
- Genus Pauleo Millen & Hamann, 1992 (1)
- Genus Phidiana Gray, 1850 (15)
- Genus Pruvotfolia J. Tardy, 1970 (5)
- Genus Rizzolia Trinchese, 1877 accepted as Cratena Bergh, 1864
- Genus Rolandia Pruvot-Fol, 1951 accepted as Pruvotfolia J. Tardy, 1970
- Genus Sakuraeolis Baba, 1965 (9)
- Genus Setoeolis Baba, 1965 (1)
- Family Favorinidae Bergh, 1889 accepted as Facelinidae Bergh, 1889
- Family Flabellinidae Bergh, 1889 (38)
- Family Flabellinopsidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017 (2)
- Family Glaucidae Gray, 1827 (5)
- Family Myrrhinidae Bergh, 1905 (45)
- Family Notaeolidiidae Eliot, 1910 (3)
- Family Phidianidae Odhner, 1968 accepted as Facelinidae Bergh, 1889
- Family Phyllodesmiidae Thiele, 1931 accepted as Facelinidae Bergh, 1889
- Family Piseinotecidae Edmunds, 1970 (6)
- Family Pleurolidiidae Burn, 1966 (2)
- Family Protaeolidiellidae Odhner, 1968 accepted as Pleurolidiidae Burn, 1966
- Family Spurillidae Odhner, 1939 accepted as Aeolidiidae Gray, 1827
- Superfamily Arminoidea Iredale & O'Donoghue, 1923 (1841) (102)
- Superfamily Cladobranchia incertae sedis (8)
- Superfamily Dendronotoidea Allman, 1845 (199)
- Superfamily Doridoxoidea Bergh, 1899 (2)
- Superfamily Fionoidea Gray, 1857 (303)
- Superfamily Flabellinoidea Bergh, 1889 accepted as Fionoidea Gray, 1857
- Superfamily Proctonotoidea Gray, 1853 (49)
- Superfamily Tritonioidea Lamarck, 1809 (91)
- Suborder Cladohepatica accepted as Cladobranchia
- Suborder Dexiarchia accepted as Cladobranchia
- Suborder Doridina (1 558)
- Suborder Euctenidiacea accepted as Doridina
- Suborder Holohepatica accepted as Doridina
- Suborder Nudibranchia incertae sedis (1)
- Order Pleurobranchida (97)
- Genus Abranchus [sic] accepted as Abrancha van Hasselt, 1824
- Genus Spongiodoris Pruvot-Fol, 1933
- Superorder Ringiculimorpha (169)
- Order Pleurobranchomorpha accepted as Pleurobranchida
- Genus Abrancha van Hasselt, 1824
- Subterclass Tectipleura (34 105)
- 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