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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)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 105)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 569)
Order Aillyida accepted as Achatinina
Order Ellobiida (579)
Order Gymnomorpha accepted as Systellommatophora
Order Stylommatophora (24 766)
Suborder Achatinina (2 900)
Suborder Elasmognatha accepted as Succineoidei
Suborder Helicina (21 626)
Suborder Orthurethra accepted as Pupilloidei
Suborder Scolodontina (165)
Superfamily Scolodontoidea H. B. Baker, 1925 (165)
Family Scolodontidae H. B. Baker, 1925 (165)
Subfamily Scolodontinae H. B. Baker, 1925 (118)
Genus Ammonoceras L. Pfeiffer, 1855 accepted as Happia Bourguignat, 1890
Genus Austroselenites Kobelt, 1905 (5)
Genus Drepanostomella Bourguignat, 1890 (6)
Genus Entodina Ancey, 1887 (7)
Genus Happia Bourguignat, 1890 (31)
Genus Hirtudiscus Hylton Scott, 1973 (7)
Genus Luteostriatella Roosen & Breure, 2024 (1)
Genus Prohappia Thiele, 1927 accepted as Happia (Prohappia) Thiele, 1927
Genus Scolodonta Doering, 1875 (20)
Genus Systrophia L. Pfeiffer, 1855 (22)
Subgenus Systrophia (Entodina) Ancey, 1887 accepted as Entodina Ancey, 1887
Subgenus Systrophia (Scolodonta) Doering, 1875 accepted as Scolodonta Doering, 1875
Subgenus Systrophia (Systrophia) L. Pfeiffer, 1855 represented as Systrophia L. Pfeiffer, 1855
Subgenus Systrophia (Systrophiella) H. B. Baker, 1925 accepted as Systrophiella H. B. Baker, 1925
Species Systrophia (Systrophiella) alicea (Guppy, 1871) represented as Systrophia alicea (Guppy, 1871)
Species Systrophia (Systrophiella) altivaga Crawford, 1939 accepted as Happia altivaga (Crawford, 1939)
Species Systrophia (Systrophiella) costaricana Rehder, 1942 accepted as Happia (Systrophiella) costaricana (Rehder, 1942)
Species Systrophia (Systrophiella) decagyra (R. A. Philippi, 1869) accepted as Happia decagyra (R. A. Philippi, 1869)
Species Systrophia (Systrophiella) gyrella (Morelet, 1863) accepted as Happia gyrella (Morelet, 1863)
Species Systrophia (Systrophiella) gyrellina F. Haas, 1951 accepted as Happia gyrellina (F. Haas, 1951)
Species Systrophia (Systrophiella) peruviana (Preston, 1907) accepted as Scolodonta peruviana (Preston, 1907)
Species Systrophia (Systrophiella) planior (F. Haas, 1951) accepted as Happia planior F. Haas, 1951
Species Systrophia (Systrophiella) tortilis (Morelet, 1863) accepted as Happia tortilis (Morelet, 1863)
Species Systrophia (Systrophiella) variegata (F. Haas, 1949) accepted as Happia variegata (F. Haas, 1949)
Species Systrophia (Systrophiella) viridis (H. B. Baker, 1925) accepted as Systrophiella viridis (H. B. Baker, 1925)
Species Systrophia (Systrophiella) weyrauchi (F. Haas, 1951) accepted as Happia weyrauchi (F. Haas, 1951)
Species Systrophia (Systrophiella) zeteki (Pilsbry, 1920) accepted as Happia (Systrophiella) zeteki (Pilsbry, 1920)
Subgenus Systrophia (Wayampia) Tillier, 1980 accepted as Scolodonta Doering, 1875
Species Systrophia affinis (Pilsbry, 1900)
Species Systrophia alcidiana Ancey, 1892 accepted as Entodina alcidiana (Ancey, 1892)
Species Systrophia alicea (Guppy, 1871) accepted as Happia alicea (Guppy, 1871)
Species Systrophia altivaga Crawford, 1939 accepted as Systrophiella altivaga (Crawford, 1939)
Species Systrophia altorum Weyrauch, 1967
Species Systrophia angigyra F. Haas, 1949 accepted as Zilchistrophia angigyra (F. Haas, 1949)
Species Systrophia argentina (Strobel, 1874)
Species Systrophia cheilostropha (A. d'Orbigny, 1835) accepted as Entodina cheilostropha (A. d'Orbigny, 1835)
Species Systrophia circumplexa (Deshayes, 1839) accepted as Systrophiella circumplexa (Deshayes, 1839)
Species Systrophia derbyi (Ihering, 1912) accepted as Entodina derbyi (Ihering, 1912)
Species Systrophia eatoni F. Baker, 1914
Species Systrophia entodonta (L. Pfeiffer, 1859) accepted as Zilchistrophia entodonta (L. Pfeiffer, 1859)
Species Systrophia florezi Weyrauch, 1967 accepted as Miradiscops florezi (Weyrauch, 1967)
Species Systrophia haasi Weyrauch, 1960
Species Systrophia helicycloides (A. d'Orbigny, 1835)
Species Systrophia heligmoida (A. d'Orbigny, 1835)
Species Systrophia impressa F. Haas, 1951
Species Systrophia incarnum Crawford, 1939 accepted as Wayampia incarna (Crawford, 1939)
Species Systrophia insignis (A. d'Orbigny, 1835)
Species Systrophia jekylli (F. Baker, 1914) accepted as Entodina jekylli F. Baker, 1914
Species Systrophia moellendorfii Rolle, 1904
Species Systrophia obvoluta F. Haas, 1949 accepted as Zilchistrophia obvoluta (F. Haas, 1949)
Species Systrophia ortoni (Crosse, 1871)
Species Systrophia pilsbryi Weyrauch, 1958
Species Systrophia planispira Weyrauch, 1967
Species Systrophia platygyra (Albers, 1857)
Species Systrophia platysma F. Haas, 1951
Species Systrophia pollodonta (A. d'Orbigny, 1835) accepted as Entodina pollodonta (A. d'Orbigny, 1835)
Species Systrophia polycycla (Morelet, 1860)
Species Systrophia pseudoplanorbis (Lubomirski, 1880)
Species Systrophia retinella F. Haas, 1949 accepted as Scolodonta retinella (F. Haas, 1949)
Species Systrophia reyrei (Souverbie, 1858) accepted as Entodina reyrei (Souverbie, 1858)
Species Systrophia sargenti (Pilsbry, 1900)
Species Systrophia siolii F. Haas, 1955
Species Systrophia starkei (H. B. Baker, 1925) accepted as Systrophiella starkei (H. B. Baker, 1925)
Species Systrophia stenogyra (L. Pfeiffer, 1854)
Species Systrophia stenostrepta (L. Pfeiffer, 1856)
Species Systrophia systropha (Albers, 1854)
Genus Systrophiella H. B. Baker, 1925 (12)
Genus Wayampia Tillier, 1980 accepted as Scolodonta Doering, 1875 (1)
Genus Zilchistrophia Weyrauch, 1960 (6)
Subfamily Tamayoinae Tillier, 1980 (39)
Genus Keranella Roosen, Salvador & Breure, 2025 (2)
Genus Ophiogyra Albers, 1850 accepted as Polygyratia J. E. Gray, 1847
Genus Polygyratia J. E. Gray, 1847 (1)
Genus Ridleya Ancey, 1901 accepted as Ridleyconcha Christensen, 2020
Genus Ridleyconcha Christensen, 2020 (1)
Genus Smenodonta Roosen, Salvador & Breure, 2025 (1)
Genus Xenodiscula Pilsbry, 1919 (3)
Suborder Sigmurethra accepted as Helicina
Suborder Stylommatophora incertae sedis (75)
Order Systellommatophora (224)
Superorder Hygrophila (2 005)
Superorder Pneumopulmonata
Superorder Pylopulmonata (4 285)
Superorder Sacoglossa (391)
Superorder Siphonarimorpha (163)
Order Anaspidea accepted as Aplysiida
Order Aplysiida (101)
Order Aplysiomorpha accepted as Aplysiida
Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
Order Bullomorpha accepted as Cephalaspidea
Order Cephalaspidea (1 034)
Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
Order Pteropoda (414)
Order Runcinacea accepted as Runcinida
Order Runcinida (80)
Order Tectibranchiata
Order Thecosomata
Order Umbraculida (15)
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