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Mollusca (132 708)
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 (1 827)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 646)
Subclass Amphigastropoda † (387)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 590)
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 154)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 431)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 918)
Superorder Nudipleura (2 749)
Order Notaspidea accepted as Pleurobranchomorpha
Order Nudibranchia (2 652)
Suborder Aeolidina accepted as Cladobranchia
Suborder Anthobranchia accepted as Doridina
Suborder Cladobranchia (1 093)
Suborder Cladohepatica accepted as Cladobranchia
Suborder Dexiarchia accepted as Cladobranchia
Suborder Doridina (1 558)
Infraorder Bathydoridoidei (8)
Infraorder Doridoidei (1 550)
Superfamily Chromodoridoidea Bergh, 1891 (482)
Family Actinocyclidae O'Donoghue, 1929 (17)
Family Aldisidae Odhner, 1939 accepted as Cadlinidae Bergh, 1891
Family Cadlinellidae Odhner, 1934 (3)
Family Cadlinidae Bergh, 1891 (58)
Family Ceratosomatidae Gray, 1857 accepted as Miamirinae Bergh, 1891
Family Chromodorididae Bergh, 1891 (397)
Family Echinochilidae Odhner, 1968 accepted as Cadlinidae Bergh, 1891
Family Glossodorididae O'Donoghue, 1924 accepted as Chromodoridinae Bergh, 1891
Family Hexabranchidae Bergh, 1891 (6)
Family Showajidaiidae Korshunova, Fletcher, Picton, Lundin, Kashio, N. Sanamyan, K. Sanamyan, Padula, Schrödl & Martynov, 2020 (1)
Subfamily Cadlinellinae Odhner, 1934 accepted as Cadlinellidae Odhner, 1934
Subfamily Doriprismaticinae H. Adams & A. Adams, 1858 accepted as Chromodoridinae Bergh, 1891
Subfamily Inudinae Er. Marcus & Ev. Marcus, 1967 accepted as Cadlinidae Bergh, 1891
Subfamily Lissodoridinae Odhner, 1968 accepted as Chromodoridinae Bergh, 1891
Subfamily Thorunninae Odhner, 1926 accepted as Chromodoridinae Bergh, 1891
Superfamily Doridoidea Rafinesque, 1815 (434)
Superfamily Doridoidei incertae sedis
Superfamily Onchidoridacea accepted as Onchidoridoidea Gray, 1827
Superfamily Onchidoridoidea Gray, 1827 (278)
Superfamily Phyllidioidea Rafinesque, 1814 (156)
Superfamily Polyceroidea Alder & Hancock, 1845 (200)
Superfamily Porodoridacea Odhner, 1968 accepted as Phyllidioidea Rafinesque, 1814
Superfamily Porostomata Bergh, 1876 accepted as Phyllidioidea Rafinesque, 1814
Infraorder Gnathodoridacea accepted as Bathydoridoidei
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