Between brackets is the number of accepted species

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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Class Caudofoveata (143)
- Class Cephalopoda (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 623)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 154)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 431)
- 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)
- 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)
- 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)
- Family Cariopsillidae Ortea & Espinosa, 2006 accepted as Dendrodorididae O'Donoghue, 1924 (1864)
- Family Dendrodorididae O'Donoghue, 1924 (1864) (74)
- Family Doridopsidae Alder & Hancock, 1864 accepted as Dendrodorididae O'Donoghue, 1924 (1864)
- Family Forjacellidae Ortea & Moro, 2023 (1)
- Family Fryeriidae Baranetz & Minichev, 1994 accepted as Phyllidiidae Rafinesque, 1814
- Family Mandeliidae Á. Valdés & Gosliner, 1999 (1)
- Family Phyllidiidae Rafinesque, 1814 (80)
- Genus Ceratophyllidia Eliot, 1903 (2)
- Genus Fryeria Gray, 1853 accepted as Phyllidia Cuvier, 1797
- Genus Phyllidia Cuvier, 1797 (29)
- Genus Phyllidiella Bergh, 1869 (15)
- Genus Phyllidiopsis Bergh, 1876 (30)
- Species Phyllidiopsis annae Brunckhorst, 1993
- Species Phyllidiopsis anomala Á. Valdés, 2001
- Species Phyllidiopsis bayi (Bouchet, 1983)
- Species Phyllidiopsis berghi Vayssière, 1902
- Species Phyllidiopsis blanca Gosliner & Behrens, 1988
- Species Phyllidiopsis boucheti Á. Valdés & Ortea, 1996
- Species Phyllidiopsis brunckhorsti Á. Valdés, 2001
- Species Phyllidiopsis burni Brunckhorst, 1993
- Species Phyllidiopsis cardinalis Bergh, 1876
- Species Phyllidiopsis carinata Eliot, 1910 accepted as Phyllidia ocellata Cuvier, 1804
- Species Phyllidiopsis circularis Á. Valdés, 2001
- Species Phyllidiopsis crucifera Á. Valdés, 2001
- Species Phyllidiopsis dautzenbergi (Vayssière, 1912)
- Species Phyllidiopsis fissurata Brunckhorst, 1993
- Species Phyllidiopsis fissuratus Brunckhorst, 1993 accepted as Phyllidiopsis fissurata Brunckhorst, 1993
- Species Phyllidiopsis futunai Á. Valdés, 2001
- Species Phyllidiopsis gemmata (Pruvot-Fol, 1957)
- Species Phyllidiopsis gynenopla Bouchet, 1977 accepted as Phyllidiopsis berghi Vayssière, 1902
- Species Phyllidiopsis holothuriana Á. Valdés, 2001
- Species Phyllidiopsis krempfi Pruvot-Fol, 1957
- Species Phyllidiopsis loricata (Bergh, 1873)
- Species Phyllidiopsis lozoueti Á. Valdés, 2001
- Species Phyllidiopsis macrotuberculata Á. Valdés, 2001
- Species Phyllidiopsis molaensis K. B. Meyer, 1977 accepted as Phyllidiella molaensis (K. B. Meyer, 1977)
- Species Phyllidiopsis monacha (Yonow, 1986) accepted as Phyllidia monacha Yonow, 1986
- Species Phyllidiopsis neocaledonica Á. Valdés, 2001
- Species Phyllidiopsis papilligera Bergh, 1890 accepted as Ceratophyllidia papilligera (Bergh, 1890)
- Species Phyllidiopsis phiphiensis Brunckhorst, 1993
- Species Phyllidiopsis pipeki Brunckhorst, 1993 accepted as Phyllidiopsis krempfi Pruvot-Fol, 1957
- Species Phyllidiopsis quadrilineata (Bergh, 1905)
- Species Phyllidiopsis richeri Á. Valdés, 2001
- Species Phyllidiopsis shireenae Brunckhorst, 1990
- Species Phyllidiopsis sinaiensis (Yonow, 1988)
- Species Phyllidiopsis sphingis Brunckhorst, 1993
- Species Phyllidiopsis striata Bergh, 1889
- Species Phyllidiopsis vanuatuensis Á. Valdés, 2001
- Species Phyllidiopsis xishaensis (G.-Y. Lin, 1983)
- Genus Reticulidia Brunckhorst, 1990 (4)
- Genus Reyfria Yonow, 1986 accepted as Phyllidia Cuvier, 1797
- 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 (34 103)
- 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