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Mollusca (132 888)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 022)
Class Caudofoveata (143)
Class Cephalopoda (1 838)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 777)
Subclass Amphigastropoda † (396)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 684)
Subclass Gastropoda incertae sedis (309)
Subclass Heterobranchia (39 180)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 457)
Infraclass Heterobranchia incertae sedis (478)
Order Architectibranchia represented as Heterobranchia incertae sedis
Superfamily Acteonelloidea Gill, 1871 † (144)
Superfamily Itieriacea Pchelintsev, 1965 † accepted as Nerineoidea Zittel, 1873 †
Superfamily Nerineoidea Zittel, 1873 † (323)
Family Aptyxiellidae Hacobjan, 1973 † accepted as Nerinellidae Pchelintsev, 1960 †
Family Auroraellidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
Family Bactroptyxidae Pchelintsev, 1965 † accepted as Ptygmatisinae Pchelintsev, 1960 †
Family Bactroptyxisidae Pchelintsev, 1965 † accepted as Bactroptyxidae Pchelintsev, 1965 †
Family Ceritellidae Wenz, 1938 † (59)
Family Cryptoplocusidae Pchelintsev, 1960 † accepted as Cryptoplocinae Pchelintsev, 1960 †
Family Diptyxisidae Pchelintsev, 1960 † accepted as Ceritellidae Wenz, 1938 †
Family Elatioriellidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
Family Elegantellidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
Family Eunerineidae Kollmann, 2005 † (13)
Family Fibuloptygmatidae Hacobjan, 1973 † accepted as Nerineidae Zittel, 1873 †
Family Fibuloptyxidae Pchelintsev, 1965 † accepted as Ceritellidae Wenz, 1938 †
Family Fibuloptyxisidae Pchelintsev, 1965 † accepted as Fibuloptyxidae Pchelintsev, 1965 †
Family Itieriidae Cossmann, 1896 † (41)
Genus Campichia Cossmann, 1896 †
Genus Eotrochactaeon Hacobjan, 1972 † (7)
Genus Itieria Matheron, 1842 † (3)
Genus Itieroptygmatis Charvet & Termier, 1971 † (2)
Genus Itruvia Stoliczka, 1867 † (8)
Species Itruvia angusta Pchelintsev, 1953 †
Species Itruvia armenica Pchelintsev, 1953 † accepted as Vernedia marianii (de Alessandri, 1899) †
Species Itruvia canaliculata (A. d'Orbigny, 1842) †
Species Itruvia cycloidea Pchelintsev, 1953 †
Species Itruvia globoides Stoliczka, 1867 † accepted as Vernedia globoides (Stoliczka, 1867) †
Species Itruvia macedonica Kollmann, 1987 †
Species Itruvia ornata Pchelintsev, 1953 †
Species Itruvia ovalis Pchelintsev, 1954 †
Species Itruvia stephanovi Pchelintsev, 1954 †
Species Itruvia turricula Kollmann, 1987 †
Genus Omphalactaeonella [sic] † accepted as Omphaloacteonella Hacobjan, 1972 †
Genus Omphaloactaeonella [sic] † accepted as Omphaloacteonella Hacobjan, 1972 †
Genus Omphaloacteonella Hacobjan, 1972 † accepted as Ovactaeonella Djalilov, 1972 †
Genus Ovactaeonella Djalilov, 1972 † (8)
Genus Peruvia Olsson, 1934 † accepted as Peruviella Olsson, 1944 †
Genus Peruviella Olsson, 1944 † (2)
Genus Sogdianella Djalilov, 1972 † (11)
Family Nerineidae Zittel, 1873 † (101)
Family Nerinellidae Pchelintsev, 1960 † (50)
Family Nerineoidea incertae sedis † (14)
Family Phaneroptyxidae Pchelintsev, 1965 † accepted as Nerineidae Zittel, 1873 †
Family Phaneroptyxisidae Pchelintsev, 1965 † accepted as Phaneroptyxidae Pchelintsev, 1965 †
Family Polyptyxidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
Family Polyptyxisidae Pchelintsev, 1965 † accepted as Polyptyxidae Pchelintsev, 1965 †
Family Pseudonerineidae Pchelintsev, 1965 † (8)
Family Ptygmatididae Pchelintsev, 1960 † (37)
Family Ptygmatisidae Pchelintsev, 1960 † accepted as Ptygmatididae Pchelintsev, 1960 †
Family Triptyxidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
Family Triptyxisidae Pchelintsev, 1965 † accepted as Triptyxidae Pchelintsev, 1965 †
Family Upellidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
Subfamily Diptyxinae Pchelintsev, 1960 † accepted as Ceritellidae Wenz, 1938 †
Subfamily Ptygmatisinae Pchelintsev, 1960 † accepted as Ptygmatididae Pchelintsev, 1960 †
Subfamily Simploptyxinae Hacobjan, 1973 † accepted as Nerineidae Zittel, 1873 †
Superfamily Streptacidoidea Knight, 1931 † (10)
Family Dolomitellidae Bandel, 1994 †
Family Kuskokwimiidae Frýda & Blodgett, 2001 †
Family Misurinellidae Bandel, 1994 †
Genus Masaevia Guzhov & Shapovalov, 2019 † (1)
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 (6 783)
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