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Mollusca (132 738)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (24 984)
Class Caudofoveata (143)
Class Cephalopoda (1 830)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 673)
Subclass Amphigastropoda † (387)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 618)
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 153)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 430)
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)
Subfamily Eolidininae Pruvot-Fol, 1951 accepted as Aeolidiidae Gray, 1827
Genus Aeolidia Cuvier, 1798 (6)
Genus Aeolidiella Bergh, 1867 (6)
Genus Aeolidina Pruvot-Fol, 1951 accepted as Eolidina Quatrefages, 1843
Genus Aeolidiopsis Pruvot-Fol, 1956 (3)
Genus Aeolis Menke, 1844 accepted as Aeolidia Cuvier, 1798
Genus Anteaeolidiella M. C. Miller, 2001 (12)
Genus Baeolidia Bergh, 1888 (15)
Genus Berghia Trinchese, 1877 (13)
Genus Bulbaeolidia Carmona, Pola, Gosliner & Cervera, 2013 (5)
Genus Cerberilla Bergh, 1873 (17)
Genus Digitobranchus Risbec, 1937
Genus Dolicheolis H. J. Finlay, 1926 accepted as Fiona Alder & Hancock, 1853
Genus Eolida [sic] accepted as Aeolidia Cuvier, 1798
Genus Eolidia [sic] accepted as Aeolidia Cuvier, 1798
Genus Eolidina Quatrefages, 1843 accepted as Aeolidiella Bergh, 1867
Genus Eolis Cuvier, 1805 accepted as Aeolidia Cuvier, 1798
Genus Fenrisia Bergh, 1888 accepted as Cerberilla Bergh, 1873
Genus Limenandra Haefelfinger & Stamm, 1958 (6)
Genus Millereolidia Ortea, Caballer & Espinosa, 2004 accepted as Berghia Trinchese, 1877
Genus Milleria Ortea, Caballer & Espinosa, 2003 accepted as Millereolidia Ortea, Caballer & Espinosa, 2004
Genus Protaeolidia accepted as Protaeolidiella Baba, 1955
Genus Spurilla Bergh, 1864 (5)
Genus Zeusia Korshunova, Zimina & Martynov, 2017 (2)
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)
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 (34 102)
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