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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)
Infraclass Heterobranchia incertae sedis (478)
Order Architectibranchia represented as Heterobranchia incertae sedis
Superfamily Acteonelloidea Gill, 1871 † (144)
Family Acteonellidae Gill, 1871 † (144)
Genus Actaeonella Herrmannsen, 1846 † accepted as Acteonella A. d'Orbigny, 1842 †
Genus Actaeonellina Pchelintsev, 1963 † (1)
Genus Acteonella A. d'Orbigny, 1842 † (38)
Genus Acteonnella [sic] † accepted as Acteonella A. d'Orbigny, 1842 †
Genus Euactaeonina Wenz, 1947 †
Genus Mesotrochactaeon Hacobjan, 1972 † accepted as Trochactaeon Meek, 1863 †
Genus Mexicotrochactaeon Hacobjan, 1972 † accepted as Trochactaeon (Mexicotrochactaeon) Hacobjan, 1972 †
Genus Neocylindrites Kollmann, 1967 † accepted as Trochactaeon (Neocylindrites) Kollmann, 1967 †
Genus Neotrochactaeon Hacobjan, 1972 † accepted as Trochactaeon Meek, 1863 †
Genus Orthostoma Deshayes, 1850 † accepted as Euactaeonina Wenz, 1947 † (1)
Genus Palaeotrochacteon Hacobjan, 1972 † accepted as Trochactaeon (Neocylindrites) Kollmann, 1967 †
Genus Ptychostylus F. Sandberger, 1870 † (2)
Genus Purpuractaeon Hacobjan, 1963 † accepted as Trochactaeon Meek, 1863 †
Genus Sevanella Hacobjan, 1972 † accepted as Trochactaeon (Sevanella) Hacobjan, 1972 †
Genus Spiractaeon Meek, 1863 † accepted as Trochactaeon Meek, 1863 †
Genus Trochactaeon Meek, 1863 † (102)
Subgenus Trochactaeon (Mexicotrochactaeon) Hacobjan, 1972 † represented as Trochactaeon Meek, 1863 †
Subgenus Trochactaeon (Neocylindrites) Kollmann, 1967 † represented as Trochactaeon Meek, 1863 †
Species Trochactaeon (Neocylindrites) abbreviatus (Conrad, 1852) † represented as Trochactaeon abbreviatus (Conrad, 1852) †
Species Trochactaeon (Neocylindrites) absalonis (Fraas, 1867) † represented as Trochactaeon absalonis (Fraas, 1867) †
Species Trochactaeon (Neocylindrites) angustatus Pchelintsev, 1953 † represented as Trochactaeon angustatus Pchelintsev, 1953 †
Species Trochactaeon (Neocylindrites) baconicus Benkő-Czabalay, 1962 † represented as Trochactaeon baconicus Benkő-Czabalay, 1962 †
Species Trochactaeon (Neocylindrites) barremicus Sayn, 1932 † accepted as Trochactaeon (Neocylindrites) boutillieri (Cossmann, 1895) †
Species Trochactaeon (Neocylindrites) baylei (Leymerie) † represented as Trochactaeon baylei (Leymerie) †
Species Trochactaeon (Neocylindrites) belgicus (Cossmann, 1895) † represented as Trochactaeon belgicus (Cossmann, 1895) †
Species Trochactaeon (Neocylindrites) boutillieri (Cossmann, 1895) † represented as Trochactaeon boutillieri (Cossmann, 1895) †
Species Trochactaeon (Neocylindrites) briarti Geinitz, 1874 † represented as Trochactaeon briarti Geinitz, 1874 †
Species Trochactaeon (Neocylindrites) cordeiroi (Choffat, 1888) † represented as Trochactaeon cordeiroi (Choffat, 1888) †
Species Trochactaeon (Neocylindrites) crisminensis Choffat, 1901 † represented as Trochactaeon crisminensis Choffat, 1901 †
Species Trochactaeon (Neocylindrites) cumminsi Stanton, 1947 † represented as Trochactaeon cumminsi Stanton, 1947 †
Species Trochactaeon (Neocylindrites) gosaviensis Kollmann, 1967 † represented as Trochactaeon gosaviensis Kollmann, 1967 †
Species Trochactaeon (Neocylindrites) gradatus Kollmann, 1967 † represented as Trochactaeon gradatus Kollmann, 1967 †
Species Trochactaeon (Neocylindrites) minutus Stoliczka, 1868 † represented as Trochactaeon minutus Stoliczka, 1868 †
Species Trochactaeon (Neocylindrites) nelsoni Sohl & Kollmann, 1985 † represented as Trochactaeon nelsoni Sohl & Kollmann, 1985 †
Species Trochactaeon (Neocylindrites) oliviformis (Coquand, 1865) † represented as Trochactaeon oliviformis (Coquand, 1865) †
Species Trochactaeon (Neocylindrites) punctatus (Maldonado-Koerdell, 1950) † represented as Trochactaeon punctatus (Maldonado-Koerdell, 1950) †
Subgenus Trochactaeon (Sevanella) Hacobjan, 1972 † represented as Trochactaeon Meek, 1863 †
Subgenus Trochactaeon (Spiractaeon) Meek, 1863 † accepted as Trochactaeon Meek, 1863 †
Subgenus Trochactaeon (Trochactaeon) Meek, 1863 † represented as Trochactaeon Meek, 1863 †
Species Trochactaeon abbreviatus (Conrad, 1852) †
Species Trochactaeon absalonis (Fraas, 1867) †
Species Trochactaeon acuminatus (Frič, 1897) †
Species Trochactaeon agbulakhensis G. A. Aliev, 1959 † accepted as Trochactaeon intermedius Choffat, 1901 †
Species Trochactaeon alibeglyensis Pchelintsev, 1954 †
Species Trochactaeon angustatus Pchelintsev, 1953 †
Species Trochactaeon armenicus Pchelintsev, 1954 †
Species Trochactaeon arnaudi (Cossmann, 1895) †
Species Trochactaeon artsachensis (Hacobjan, 1976) †
Species Trochactaeon asiaticus Pchelintsev, 1953 † accepted as Trochactaeon schirabadensis Pchelintsev, 1953 †
Species Trochactaeon atschadjurensis Pchelintsev, 1954 †
Species Trochactaeon azerbaidjanensis G. A. Aliev, 1961 † accepted as Eotrochactaeon azerbaidjanensis (G. A. Aliev, 1961) †
Species Trochactaeon babkovi Djalilov, 1972 †
Species Trochactaeon baconicus Benkő-Czabalay, 1962 †
Species Trochactaeon barremicus Sayn, 1932 † accepted as Trochactaeon (Neocylindrites) boutillieri (Cossmann, 1895) †
Species Trochactaeon baylei (Leymerie) †
Species Trochactaeon belgicus (Cossmann, 1895) †
Species Trochactaeon beyrichii (Drescher, 1863) †
Species Trochactaeon biconicus Pchelintsev, 1954 †
Species Trochactaeon boutillieri (Cossmann, 1895) †
Species Trochactaeon briarti Geinitz, 1874 †
Species Trochactaeon burckhardti (Böse, 1923) †
Species Trochactaeon caucasicus Pchelintsev, 1953 †
Species Trochactaeon choffati Pchelintsev, 1954 †
Species Trochactaeon collignoni (Dartevelle & Brébion, 1956) †
Species Trochactaeon communis Pchelintsev, 1954 †
Species Trochactaeon conicus (Münster, 1844) †
Species Trochactaeon coniformis (Böse, 1906) †
Species Trochactaeon conoideus (Matheron, 1843) †
Species Trochactaeon cordeiroi (Choffat, 1888) †
Species Trochactaeon cossmanni Choffat, 1886 † accepted as Trochactaeon giganteus subglobosus (Münster, 1844) †
Species Trochactaeon cretaceus (J. Müller, 1851) †
Species Trochactaeon crisminensis Choffat, 1901 †
Species Trochactaeon cumminsi Stanton, 1947 †
Species Trochactaeon cycloideus Pchelintsev, 1954 †
Species Trochactaeon cylindraceus Stoliczka, 1868 †
Species Trochactaeon cylindricus Pchelintsev, 1928 †
Species Trochactaeon dalidagensis Pchelintsev, 1954 †
Species Trochactaeon damesi (Futterer, 1892) †
Species Trochactaeon darwasensis Djalilov, 1964 †
Species Trochactaeon dilatatus Pchelintsev, 1954 † accepted as Trochactaeon giganteus subglobosus (Münster, 1844) †
Species Trochactaeon dolioliformis Pchelintsev, 1953 †
Species Trochactaeon dubertreti (Delpey, 1940) †
Species Trochactaeon ellipsoides (Fittipaldi, 1901) † accepted as Trochactaeon matensis (Fittipaldi, 1901) †
Species Trochactaeon ellipticus (Zekeli, 1852) †
Species Trochactaeon excelsus Pchelintsev, 1954 †
Species Trochactaeon frazierensis (F. M. Anderson, 1958) †
Species Trochactaeon galloprovincialis Cossmann, 1896 †
Species Trochactaeon ghazirensis (Delpey, 1940) †
Species Trochactaeon giganteus (J. De C. Sowerby, 1832) †
Species Trochactaeon glandiformis (Zekeli, 1852) †
Species Trochactaeon goldfussi (A. d'Orbigny, 1850) †
Species Trochactaeon gorindjukiensis Dvali, 1966 † accepted as Eotrochactaeon gorindjukiensis (Dvali, 1966) †
Species Trochactaeon gosaviensis Kollmann, 1967 †
Species Trochactaeon gracilis Pchelintsev, 1954 †
Species Trochactaeon gradatus Kollmann, 1967 †
Species Trochactaeon granthamensis Sohl & Kollmann, 1985 †
Species Trochactaeon gulistanensis Pchelintsev, 1954 †
Species Trochactaeon humei (Greco, 1916) †
Species Trochactaeon idjevanensis (Hacobjan, 1976) †
Species Trochactaeon impressus Pchelintsev, 1954 † accepted as Trochactaeon (Mexicotrochactaeon) burckhardti (Böse, 1923) †
Species Trochactaeon insignis Pchelintsev, 1954 † accepted as Trochactaeon pruniformis (Böse, 1923) †
Species Trochactaeon intermedius Choffat, 1901 †
Species Trochactaeon kuehni Kollmann, 1967 †
Species Trochactaeon lamarcki (J. De C. Sowerby, 1835) †
Species Trochactaeon laticostata (Hacobjan, 1972) †
Species Trochactaeon latus Pchelintsev, 1954 †
Species Trochactaeon longisulcus (Hacobjan, 1976) †
Species Trochactaeon mammilatus (Hacobjan, 1976) †
Species Trochactaeon matensis (Fittipaldi, 1901) †
Species Trochactaeon melonensis Sohl & Kollmann, 1985 †
Species Trochactaeon minutus Stoliczka, 1868 †
Species Trochactaeon mirabilis Pchelintsev, 1954 †
Species Trochactaeon nelsoni Sohl & Kollmann, 1985 †
Species Trochactaeon obesus Pchelintsev, 1954 †
Species Trochactaeon obliqueplicatus (Böse, 1923) † accepted as Trochactaeon (Mexicotrochactaeon) burckhardti (Böse, 1923) †
Species Trochactaeon obtusus (Zekeli, 1852) †
Species Trochactaeon oliviformis (Coquand, 1865) †
Species Trochactaeon ornatus Pchelintsev, 1953 †
Species Trochactaeon ouremensis Choffat, 1901 †
Species Trochactaeon ovalis Pchelintsev, 1953 †
Species Trochactaeon packardi (F. M. Anderson, 1958) †
Species Trochactaeon palmeri Sohl & Kollmann, 1985 †
Species Trochactaeon pamiricum Pchelintsev, 1960 †
Species Trochactaeon parvus Stanton, 1947 † accepted as Trochactaeon cumminsi Stanton, 1947 †
Species Trochactaeon parvus (Blanckenhorn, 1890) †
Species Trochactaeon patagonicus (Feruglio, 1936) †
Species Trochactaeon pchelincevi (Hacobjan, 1963) †
Species Trochactaeon projectiliformis Kollmann, 1967 †
Species Trochactaeon pruniformis (Böse, 1923) † accepted as Trochactaeon (Mexicotrochactaeon) burckhardti (Böse, 1923) †
Species Trochactaeon pseudocylindraceus Pchelintsev, 1953 † accepted as Trochactaeon matensis (Fittipaldi, 1901) †
Species Trochactaeon punctatus (Maldonado-Koerdell, 1950) †
Species Trochactaeon quadratus Pchelintsev, 1954 †
Species Trochactaeon regularis Pchelintsev, 1953 †
Species Trochactaeon renauxi [sic] † accepted as Trochactaeon renauxianus (A. d'Orbigny, 1842) †
Species Trochactaeon renauxianus (A. d'Orbigny, 1842) †
Species Trochactaeon robustus Pchelintsev, 1954 † accepted as Trochactaeon pruniformis (Böse, 1923) †
Species Trochactaeon rossi Sohl & Kollmann, 1985 †
Species Trochactaeon rugosus G. A. Aliev, 1959 † accepted as Eotrochactaeon rugosus (G. A. Aliev, 1959) †
Species Trochactaeon sanctaecrucis (Futterer, 1892) †
Species Trochactaeon scalatus (Schnarrenberger, 1901) †
Species Trochactaeon schiosensis (G. Böhm, 1895) †
Species Trochactaeon schirabadensis Pchelintsev, 1953 †
Species Trochactaeon sergipensis Maury, 1936 † accepted as Peruviella gerthi (Olsson, 1934) †
Species Trochactaeon similis Pchelintsev, 1954 †
Species Trochactaeon solidus Pchelintsev, 1954 †
Species Trochactaeon speciosus Pchelintsev, 1954 †
Species Trochactaeon stabilis Dvali, 1966 † accepted as Eotrochactaeon stabilis (Dvali, 1966) †
Species Trochactaeon stelzneri Geinitz, 1874 †
Species Trochactaeon subangustatus Pchelintsev, 1953 † accepted as Trochactaeon (Neocylindrites) crisminensis Choffat, 1901 †
Species Trochactaeon subburkhardti Pchelintsev, 1954 †
Species Trochactaeon subglandiformis Pchelintsev, 1954 † accepted as Trochactaeon glandiformis (Zekeli, 1852) †
Species Trochactaeon subglobosus (Münster, 1844) † accepted as Trochactaeon giganteus subglobosus (Münster, 1844) †
Species Trochactaeon subobtusus Pchelintsev, 1953 † accepted as Trochactaeon ellipsoides (Fittipaldi, 1901) †
Species Trochactaeon subovatus Pchelintsev, 1954 † accepted as Trochactaeon glandiformis (Zekeli, 1852) †
Species Trochactaeon subpruniformis Pchelintsev, 1954 †
Species Trochactaeon subrenauxi Pchelintsev, 1928 †
Species Trochactaeon szontaghi (Todiriță-Mihăilescu, 1966) †
Species Trochactaeon teaensis Sohl & Kollmann, 1985 †
Species Trochactaeon tovusensis (Hacobjan, 1976) † accepted as Trochactaeon matensis (Fittipaldi, 1901) †
Species Trochactaeon transylvanicus Hojnos, 1921 † accepted as Trochactaeon giganteus subglobosus (Münster, 1844) †
Species Trochactaeon truncatus Stoliczka, 1868 †
Species Trochactaeon tuberculatus (Hacobjan, 1974) †
Species Trochactaeon tuilaensis W. Yü, 1983 †
Species Trochactaeon tumidus Pchelintsev, 1953 †
Species Trochactaeon variospiralis (Hacobjan, 1976) †
Species Trochactaeon vasmikuchensis Djalilov, 1964 †
Species Trochactaeon vediensis (Hacobjan, 1963) †
Species Trochactaeon ventricosus Hojnos, 1921 †
Species Trochactaeon woodsi (Rennie, 1930) †
Species Trochactaeon wrighti Sohl & Kollmann, 1985 †
Species Trochactaeon zekelii Pchelintsev, 1954 †
Genus Volvulina Stoliczka, 1866 † accepted as Acteonella A. d'Orbigny, 1842 †
Family Orthostomatidae Delpey, 1940 † accepted as Acteonellidae Gill, 1871 †
Superfamily Itieriacea Pchelintsev, 1965 † accepted as Nerineoidea Zittel, 1873 †
Superfamily Nerineoidea Zittel, 1873 † (323)
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 (6 782)
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