Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Phylum Cnidaria
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia incertae sedis
- Phylum Echinodermata
- Phylum Entoprocta
- Phylum Gastrotricha
- Phylum Gnathostomulida
- Phylum Hemichordata
- Phylum Hyolitha †
- Phylum Kinorhyncha
- Phylum Lobopoda †
- Phylum Loricifera
- Phylum Micrognathozoa
- Phylum Mollusca
- Class Aplacophora
- Class Bivalvia
- Class Calyptoptomatida †
- Class Camerothecida
- Class Cephalopoda
- Class Cricoconarida †
- Class Gastropoda
- Subclass Neritimorpha
- Subclass Neritimorpha incertae sedis
- Subclass Vetigastropoda
- Subclass Vetigastropoda incertae sedis
- Order Acochlidiacea
- Order Acochlidioidea
- Order Allogastropoda †
- Order Anaspidea
- Order Archaeogastropoda
- Order Archaeopulmonata
- Order Architaenioglossa
- Order Architaenoglossa accepted as Architaenioglossa
- Order Basommatophora
- Order Basommatophora incertae sedis
- Order Bellerophontida †
- Order Caenogastropoda (awaiting allocation)
- Order Caenogastropoda incertae sedis
- Order Cephalaspidea
- Order Cocculiniformia
- Order Coenogastropoda incertae sedis
- Order Cylindrobullida
- Order Cyrtoneritimorpha †
- Order Docoglossa
- Order Ellobiida
- Order Eogastropoda
- Order Euomphalina †
- Order Eupulmonata incertae sedis
- Order Gastropoda (awaiting allocation)
- Order Gastropoda incertae sedis
- Order Gymnosomata
- Order Helicinoidea †
- Order Heterobranchia incertae sedis
- Order Heterostropha
- Order Heterostrophia accepted as Heterostropha
- Order Hygrophila
- Order Hypsogastropoda incertae sedis
- Order Littorinimorpha
- Family Adeorbidae Monterosato, 1884 accepted as Tornidae Sacco, 1896
- Family Amnicolidae Tryon, 1863
- Family Amphiperatidae Gray, 1853 accepted as Ovulidae Fleming, 1822
- Family Anabathridae Keen, 1971
- Family Anabathronidae accepted as Anabathridae Keen, 1971
- Family Annulariidae Henderson & Bartsch, 1920
- Family Ansolidae Slavoshevskaya, 1975 accepted as Barleeiidae Gray, 1857
- Family Aporrhaidae Gray, 1850
- Family Aporrhaididae accepted as Aporrhaidae Gray, 1850
- Family Aporrhaiidae accepted as Aporrhaidae Gray, 1850
- Family Assimineidae H. Adams & A. Adams, 1856
- Family Atlantidae Rang, 1829
- Family Baicaliidae P. Fischer, 1885 accepted as Amnicolidae Tryon, 1863
- Family Barleeidae Gray, 1857 accepted as Barleeiidae Gray, 1857
- Family Barleeiidae Gray, 1857
- Family Bellerophinidae †
- Family Bembiciidae Finlay, 1928 accepted as Littorinidae Gray, 1840
- Family Benedictiidae Clessin, 1880 accepted as Lithoglyphidae Tryon, 1866
- Family Bithyniidae Gray, 1857
- Family Bohaispiridae †
- Family Bursidae Thiele, 1925
- Family Bythinellidae Locard, 1893
- Family Caecidae Gray, 1850
- Family Caledoniellidae Rosewater, 1969 accepted as Vanikoridae Gray, 1840
- Family Calopiidae Ponder, 1999
- Family Calyptraeidae Lamarck, 1809
- Family Capulidae Fleming, 1822
- Family Carinariidae Blainville, 1818
- Family Cassidae Latreille, 1825
- Family Cheileidae Macpherson & Chapple, 1951 accepted as Hipponicidae Troschel, 1861
- Family Chondropomatidae Henderson & Bartsch, 1920 accepted as Annulariidae Henderson & Bartsch, 1920
- Family Choristeidae Verrill, 1882 accepted as Naticidae Gray, 1840
- Family Choristidae Verrill, 1882 accepted as Naticidae Gray, 1840
- Family Cingulopsidae Fretter, 1958
- Family Clenchiellidae D. W. Taylor, 1966
- Family Cochliopidae Tryon, 1866
- Family Colombellinidae Fischer, 1884 †
- Family Coriandriidae F. Nordsieck, 1972 accepted as Cingulopsidae Fretter, 1958
- Family Coxiellidae Iredale, 1943 accepted as Pomatiopsidae Stimpson, 1865
- Family Crepidulidae Fleming, 1822 † accepted as Calyptraeidae Lamarck, 1809
- Family Ctiloceratidae Iredale & Laseron, 1957 accepted as Caecidae Gray, 1850
- Family Cyclostomatidae Menke, 1828 accepted as Pomatiidae Newton, 1891
- Family Cymatiidae Iredale, 1913
- Family Cypraeidae Rafinesque, 1815
- Family Delavayidae Annandale, 1924 accepted as Pomatiopsidae Stimpson, 1865
- Family Doliidae Latreille, 1825 accepted as Tonnidae Suter, 1913
- Family Eatoniellidae Ponder, 1965
- Family Elachisinidae Ponder, 1985
- Family Emblandidae Ponder, 1985
- Family Emmericiidae Brusina, 1870
- Family Eocypraeidae Schilder, 1924
- Family Epigridae Ponder, 1985
- Family Eratoidae Gill, 1871
- Family Ericiidae Wenz, 1915 accepted as Pomatiidae Newton, 1891
- Family Falsicingulidae Slavosheveskaya, 1976
- Family Faxiidae Ravn, 1933 † accepted as Pickworthiidae Iredale, 1917
- Family Ficidae Meek, 1864
- Family Ficulidae Carpenter, 1857 accepted as Ficidae Meek, 1864
- Family Firolidae Rafinesque, 1815 accepted as Pterotracheidae Oken, 1815
- Family Haloceratidae Warén & P, 1991
- Family Helicostoidae Pruvot-Fol, 1937
- Family Hipponicidae Troschel, 1861
- Family Hydrobiidae Troschel, 1857
- Genus Achaiohydrobia Falniowski, 2021
- Genus Adriohydrobia Radoman, 1973
- Genus Adriolitorea Radoman, 1974 accepted as Islamia Radoman, 1973
- Genus Aghbalia Glöer, Mabrouki & Taybi, 2020
- Genus Agrafia Szarowska & Falniowski, 2011
- Genus Ainiella Taybi, Glöer & Mabrouki, 2022
- Genus Aluta Jekelius, 1932 † accepted as Brasovia Neubauer, Kroh, Harzhauser, Georgopoulou & Mandic, 2015 †
- Genus Alzoniella Giusti & Bodon, 1984
- Genus Anadoludamnicola Şahin, Koca & Yildirim, 2012
- Genus Anagasta Radoman, 1973
- Genus Anagastina Radoman, 1978
- Genus Anatiniana Fagot, 1892
- Genus Anatolidamnicola Şahin, Koca & Yildirim, 2012
- Genus Andesipyrgus Hershler & Velkovrh, 1993
- Genus Andrusovia Westerlund, 1902
- Genus Andrussovia Dybowski & Grochmalicki, 1917
- Genus Andrussowiella Wenz, 1939 accepted as Tanousia Bourguignat, 1881
- Genus Angrobia Iredale, 1943
- Genus Antibaria Radoman, 1973
- Genus Antillobia Altaba, 1993
- Genus Antrorbis Hershler & Thompson, 1990
- Genus Antroselatus
- Genus Apachecoccus Taylor, 1987
- Genus Arenicola Martens, 1870 accepted as Amnicola Gould & Haldeman in Haldeman, 1840
- Genus Arganiella Giusti & Pezzoli, 1980
- Genus Aristidia Bourguignat, 1887 accepted as Horatia Bourguignat, 1887
- Genus Austropyrgus Cotton, 1942
- Genus Aveniona Cossmann, 1900 accepted as Avenionia Nicolas, 1882
- Genus Avenionia Nicolas, 1882
- Genus Avenonia Cossmann, 1900 accepted as Avenionia Nicolas, 1882
- Genus Badenia Finlay, 1930 † accepted as Onoba H. Adams & A. Adams, 1852
- Genus Baglivia Brusina, 1892 †
- Genus Balkanica Georgiev, 2011
- Genus Balkanospeum Georgiev, 2012
- Genus Bania Brusina, 1896 †
- Genus Beddomea Dautzenberg, 1900 accepted as Beddomeia Petterd, 1889
- Genus Beddomeia Petterd, 1889
- Genus Beddomena Iredale, 1943 accepted as Beddomeia Petterd, 1889
- Genus Belchatovia Kadolsky & Piechocki, 2000 †
- Genus Belgrandia Bourguignat, 1870
- Genus Belgrandiella A. J. Wagner, 1928
- Genus Belgrandiellopsis Khalloufi, Béjaoui & Delicado, 2020
- Genus Beogradica Pavlović, 1927 †
- Genus Bettupnella Whitley, 1929 accepted as Bythinella Moquin-Tandon, 1856
- Genus Birgella Baker, 1926
- Genus Biserta Khalloufi, Béjaoui & Delicado, 2020
- Genus Bithinella Moquin-Tandon, 1855 accepted as Bythinella Moquin-Tandon, 1856
- Genus Bithiniella Pezant, 1908 accepted as Bythinella Moquin-Tandon, 1856
- Genus Bithiospeum Caziot, 1912 accepted as Bythiospeum Bourguignat, 1882
- Genus Bithynella Fagot, 1886 accepted as Bythinella Moquin-Tandon, 1856
- Genus Bithyniella Paetel, 1875 accepted as Bythinella Moquin-Tandon, 1856
- Genus Bitinela Nicodim, 1913 accepted as Bythinella Moquin-Tandon, 1856
- Genus Boetersiella Arconada & Ramos, 2001
- Genus Boleana Radoman, 1983
- Genus Bracenica Radoman, 1973 †
- Genus Brasovia Neubauer, Kroh, Harzhauser, Georgopoulou & Mandic, 2015 †
- Genus Brazieria Petterd, 1889 accepted as Petterdiana Brazier, 1896
- Genus Bullaregia Khalloufi, Bejaoui & Delicado, 2017
- Genus Bylthinella Fischer, 1878 accepted as Bythinella Moquin-Tandon, 1856
- Genus Bythinela Nicodim, 1913 accepted as Bythinella Moquin-Tandon, 1856
- Genus Bythiniella Paetel, 1875 accepted as Bythinella Moquin-Tandon, 1856
- Genus Bythiopsis Clessin, 1885 accepted as Bythiospeum Bourguignat, 1882
- Genus Bythiospaeum Fischer, 1885 accepted as Bythiospeum Bourguignat, 1882
- Genus Bythiospeum Bourguignat, 1882
- Genus Bythmella Kobelt, 1913 accepted as Bythinella Moquin-Tandon, 1856
- Genus Bythynella Gourdon, 1889 accepted as Bythinella Moquin-Tandon, 1856
- Genus Caldicochlea Ponder, 1997
- Genus Caldicocochlea Ponder, 1997
- Genus Cariohydrobia Delicado & Gürlek, 2021
- Genus Caspia Clessin & W. Dybowski, 1887
- Genus Caspiella Thiele, 1928
- Genus Caspiohydrobia Starobogatov, 1970 †
- Genus Caucasogeyeria Grego & Mumladze, 2020
- Genus Caucasopsis Grego & Mumladze, 2020
- Genus Cavernisa Radoman, 1978 †
- Genus Chilopyrgula Brusina, 1896
- Genus Chirgisia Glöer, Boeters & Pešić, 2014
- Genus Chondrobasis Arconada & Ramos, 2001
- Genus Cilgia Schutt, 1968
- Genus Cincinnatia Pilsbry, 1891
- Genus Clappia Walker, 1909
- Genus Clathrocaspia Lindholm, 1929 accepted as Caspia Clessin & W. Dybowski, 1887
- Genus Clessinia Dybowski, 1888 accepted as Turricaspia Dybowski & Grochmalicki, 1917
- Genus Clessiniola Lindholm, 1924
- Genus Clessinola Strand, 1928 accepted as Clessiniola Lindholm, 1924
- Genus Cochlicopa Paetel, 1888 accepted as Cochliopa Stimpson, 1865
- Genus Cochliopia Tryon, 1883 accepted as Cochliopa Stimpson, 1865
- Genus Coelacanthia Andrusov, 1890 †
- Genus Corbellaria Callot-Girardi & Boeters, 2012
- Genus Corrosella Boeters, 1970
- Genus Costellina Kuščer, 1933
- Genus Cyclothyrella Neubauer, Mandic, Harzhauser & Hrvatović, 2013 †
- Genus Dabriana Radoman, 1974
- Genus Dalhousia Ponder, Colgan, Terzis, Clark & Miller, 1996
- Genus Dalmatella Velkovrh, 1970
- Genus Dalmatinella Radoman, 1973
- Genus Daphniola Radoman, 1973
- Genus Deganta Arconada & Ramos, 2019
- Genus Devetakia Georgiev & Glöer, 2011
- Genus Diana Clessin, 1878 † accepted as Dianella Gude, 1913 †
- Genus Dianella Gude, 1913 †
- Genus Didacus Delicado, Machordom & Ramos, 2015 accepted as Diegus Delicado, Machordom & Ramos, 2016
- Genus Diegus Delicado, Machordom & Ramos, 2016
- Genus Ecrobia Stimpson, 1865
- Genus Edgbastonia Ponder, 2008
- Genus Edrozeba Guzhov, 2023 †
- Genus Elona Moquin-Tandon, 1855
- Genus Erosiconcha Delicado & Gürlek, 2021
- Genus Euxinipyrgula Sitnikova & Starobogatov, 1999
- Species Euxinipyrgula azovica (Golikov & Starobogatov, 1966)
- Species Euxinipyrgula borysthenica (Alexenko & Starobogatov, 1987)
- Species Euxinipyrgula grigorievi (Alexenko & Starobogatov, 1987)
- Species Euxinipyrgula limanica (Golikov & Starobogatov, 1966)
- Species Euxinipyrgula lincta (Milaschewitsch, 1908)
- Species Euxinipyrgula milachevitchi (Golikov & Starobogatov, 1966)
- Species Euxinipyrgula ostroumovi (Golikov & Starobogatov, 1966)
- Species Euxinipyrgula ukrainica (Alexenko & Starobogatov, 1987)
- Genus Falniowskia Bernasconi, 1990
- Genus Fessia Glöer, Mabrouki & Taybi, 2020
- Genus Fissuria Boeters, 1981
- Genus Floridobia F. G. Thompson & Hershler, 2002
- Genus Flumincola Eastman, 1900 † accepted as Fluminicola Stimpson, 1865
- Genus Flumnicola Dollfuss, 1912 † accepted as Fluminicola Stimpson, 1865
- Genus Fluvidona Iredale, 1937
- Genus Fonscochlea Ponder, Hershler & Jenkins, 1989
- Genus Fontelicella Gregg & Taylor, 1965
- Genus Fontigens
- Genus Frauenfeldia Clessin, 1878 accepted as Graziana Radoman, 1975
- Genus Frauenfeldtia Chappuis, 1927
- Genus Gafaita Taybi, Glöer & Mabrouki, 2023
- Genus Geyeria A. J. Wagner, 1914 accepted as Plagigeyeria Tomlin, 1930
- Genus Gillia Stimpson, 1865
- Genus Ginaia Brusina, 1896
- Genus Gloeria Georgiev, Dedov & Cheshmedjiev, 2012
- Genus Gocea Hadžišče, 1956
- Genus Godlewskia Clessin, 1883
- Genus Goniochilus Sandberger, 1875 †
- Genus Graecamnicola Willmann, 1981 †
- Genus Graecoanatolica Radoman, 1973
- Genus Graecoarganiella Falniowski & Szarowska, 2011
- Genus Graecorientalia Radoman, 1973
- Genus Graziana Radoman, 1975
- Genus Grossuana Radoman, 1983
- Genus Guadiella Boeters, 2003
- Genus Gyromelania Wenz, 1939 †
- Genus Hadoceras Hershler & Longley, 1986 accepted as Phreatoceras Hershler & Longley, 1987
- Genus Hadziella Kuščer, 1932
- Genus Hadžiella Kuščer, 1932 accepted as Hadziella Kuščer, 1932
- Genus Harzhauseria Neubauer & Wesselingh, 2023 †
- Genus Hauffenia Pollonera, 1898
- Genus Hausdorfenia Grego & Mumladze, 2020
- Genus Hemistoma accepted as Hemistomia Crosse, 1872
- Genus Hemite Gürlek, 2018
- Genus Heraultia Bodon, Manganelli & Giusti, 2001
- Genus Heraultiella Bodon, Manganelli & Giusti, 2002
- Genus Heterocyclus Crosse, 1872
- Genus Heteroryclus Crosse, 1893
- Genus Holsingeria Hershler, 1988
- Genus Horatia Bourguignat, 1887
- Genus Hoyia Baker, 1926
- Genus Huttonia Johnston, 1891 accepted as Potamopyrgus Stimpson, 1865
- Genus Hyalopyrgus Thompson, 1968
- Genus Hydrobia Hartmann, 1821
- Genus Hydrobius Wright, 1851 † accepted as Hydrobia Hartmann, 1821
- Genus Hydropia Millet, 1854 † accepted as Hydrobia Hartmann, 1821
- Genus Hydrorissoia Bavay, 1895
- Genus Hygrobia Beck, 1847 † accepted as Hydrobia Hartmann, 1821
- Genus Iberhoratia Arconada & Ramos, 2007
- Genus Idrisiella Mabrouki, Glöer & Taybi, 2022
- Genus Ifrania Glöer, Mabrouki & Taybi, 2020
- Genus Iglicopsis Falniowski & Hofman, 2021
- Genus Illyricella Neubauer, Mandic & Harzhauser, 2016 †
- Genus Imeretiopsis Grego & Mumladze, 2020
- Genus Indopyrgus Thiele, 1928
- Genus Insignia Angelov, 1972
- Genus Intermaria Delicado, Pešić & Glöer, 2016
- Genus Ipnobius Hershler, 2001
- Genus Iraklimelania Willmann, 1981 †
- Genus Isimerope Radea & Parmakelis, 2013
- Genus Islamia Radoman, 1973
- Genus Islamiella Guzhov, 2023 †
- Genus Isparta Yldirim, Koca, Gürlek & Glöer, 2018
- Genus Istriana Velkovrh, 1971 †
- Genus Iverakia Glöer & Pešić, 2014
- Genus Jardinella Iredale & Whitley, 1938
- Genus Jekeliella Bandel, 2010 †
- Genus Josefus Arconada & Ramos, 2006
- Genus Kadolskya Neubauer & Harzhauser, 2016 †
- Genus Karevia Hadžišče, 1959 accepted as Ohrigocea Hadžišče, 1959
- Genus Kartvelobia Grego & Mumladze, 2020
- Genus Karucia Glöer & Pešić, 2013
- Genus Kaskakia Glöer & Pešić, 2012
- Genus Keindahan Haase & Bouchet, 2006
- Genus Kerchia Bandel, 2010 †
- Genus Kerkia Radoman, 1978
- Genus Kolevia Georgiev & Glöer, 2015
- Genus Korotnewia Kožov, 1936
- Genus Laevicaspia Dybowski & Grochmalicki, 1917
- Genus Lanzaia Brusina, 1906
- Genus Lanzaiopsis Bole, 1989
- Genus Lartetia Bourguignat, 1869
- Genus Latetia Kennard & Woodward, 1926 accepted as Lartetia Bourguignat, 1869
- Genus Leachia Risso, 1826 accepted as Hydrobia Hartmann, 1821
- Genus Leucosia Dybowski, 1875
- Genus Limnidia Schütt in Schütt & Besenecker, 1973 † accepted as Pseudamnicola Paulucci, 1878
- Genus Liobacalia Dybowski & Grochmalicki, 1920
- Genus Liobaicalia Martens, 1876
- Genus Liobaikalia Dall, 1877
- Genus Liogyrus Fischer & Crosse, 1891 accepted as Lyogyrus Gill, 1863
- Genus Lisinskia Brusina, 1897 †
- Genus Lithoglyphoides Sturany & Wagner, 1915
- Genus Lithoglyphulus Schlickum & Schütt, 1971 accepted as Tanousia Servain, 1881
- Genus Litorinella Thomä, 1845
- Genus Litorinella Braun, 1843 accepted as Hydrobia Hartmann, 1821
- Genus Litthabitella Boeters, 1970
- Genus Littoridinops Pilsbry, 1952
- Genus Littorinella Herrmannsen, 1847
- Genus Littorinidea Cossmann, 1921 accepted as Littoridina Souleyet in Vaillant, 1852
- Genus Lobaunia Haase, 1993
- Genus Lobogenes Pilsbry & Bequaert, 1927
- Genus Lutetiella Kadolsky, 2015 †
- Genus Lyhnidia Hadžišče, 1956
- Genus Lyogryrus Gill, 1863 accepted as Lyogyrus Gill, 1863
- Genus Lyrodes Doering, 1885
- Genus Lythoglyphus Moore, 1898 accepted as Lithoglyphus C. Pfeiffer, 1828
- Genus Maakia Paetel, 1888
- Genus Macedopyrgula Radoman, 1973
- Genus Maeotidia Andrusov, 1890 †
- Genus Malaprespia Radoman, 1973
- Genus Manchia Dybowsky & Grochmalicki, 1923
- Genus Marstonia F. C. Baker, 1926
- Genus Marticia Brusina, 1897 †
- Genus Martinietta Schlickum, 1974 †
- Genus Mercuria Boeters, 1971
- Genus Mervicia Bole, 1968
- Genus Mexistiobia Hershler, 1985
- Genus Mexithauma Taylor, 1966
- Genus Meyrargueria Girardi, 2009
- Genus Microbeliscus Sandberger, 1875 †
- Genus Micromelania Brusina, 1874 †
- Genus Microprososthenia Kadolsky & Piechocki, 2000 †
- Genus Micropyrgula Polinski, 1929
- Genus Microstygia Georgiev & Glöer, 2015
- Genus Mienisiella Schütt, 1991 accepted as Islamia Radoman, 1973
- Genus Mikrogoniochilus Willmann, 1981 †
- Genus Milesiana Arconada & Ramos, 2006
- Genus Moitissieria Clessin, 1880 accepted as Moitessieria Bourguignat, 1863
- Genus Montenegrospeum Pešić & Glöer, 2013
- Genus Motsametia Vinarski, Palatov & Glöer, 2014
- Genus Muellerpalia Bandel, 2010 †
- Genus Nanivitrea Thiele, 1927
- Genus Nanocochlea Ponder & Clark in Ponder, Clark, Miller & Toluzzi, 1993
- Genus Narentana Radoman, 1973
- Genus Narentiana Radoman, 1973
- Genus Navalis Quiñonero-Salgado & Rolán, 2017
- Genus Nematurella Sandberger, 1875 †
- Genus Neofossarulus Polinski, 1929
- Genus Neohoratia Schütt, 1961
- Genus Notogillia Pilsbry in Olsson & Harbison, 1953
- Genus Nymphophilus Taylor, 1966 †
- Genus Obrovia Radoman, 1974 accepted as Hydrobia Hartmann, 1821
- Genus Ochridopyrgula Radoman, 1955
- Genus Odontohydrobia Pavlović, 1927 †
- Genus Ohridohauffenia Hadžišče, 1956
- Genus Ohridohoratia Hadžišče, 1956
- Genus Ohridonaumia Glöer & Pešić, 2023
- Genus Ohrigocea Hadžišče, 1959
- Genus Orientalia Radoman, 1972 † accepted as Radomaniola Szarowska, 2006
- Genus Orientalina Radoman, 1978 † accepted as Radomaniola Szarowska, 2006
- Genus Oxypyrgula Logvinenko & Starobogatov, 1968
- Genus Paladihiopsis Haas, 1929
- Genus Paladilhiopis
- Genus Paludestina Paetel, 1875
- Genus Paludestrema
- Genus Paludestrina d'Orbigny, 1840
- Genus Paludiscala Taylor, 1966
- Genus Parabaicalia Dybowski, 1911
- Genus Parabaikalia Lindholm, 1909
- Genus Parabythinella Radoman, 1973 accepted as Marstoniopsis van Regteren Altena, 1936
- Genus Parhydrobia Cossmann & Dollfus, 1913
- Genus Patamopyrgos Paetel, 1888 accepted as Potamopyrgus Stimpson, 1865
- Genus Patamopyrgus Pilsbry & Bequaert, 1927 accepted as Potamopyrgus Stimpson, 1865
- Genus Pauluccia Brusina, 1902
- Genus Pauluccinella Giusti & Pezzoli, 1990
- Genus Peringia Paladilhe, 1874
- Genus Perringia Paetel, 1888 accepted as Peringia Paladilhe, 1874
- Genus Persipyrgula Delicado, Pešić & Glöer, 2016
- Genus Petterdiana Brazier, 1896
- Genus Petterdiella Pilsbry, 1900 accepted as Petterdiana Brazier, 1896
- Genus Pezzolia Bodon & Giusti, 1986
- Genus Phrantela Iredale, 1943
- Genus Phreatica Velkovrh, 1970
- Genus Phreatoceras Hershler & Longley, 1987
- Genus Phreatodrobia Hershler & Longley, 1986
- Genus Pikasia Taybi, Glöer & Mabrouki, 2021
- Genus Pingyispira Li, 1986, nom. nud. † accepted as Pingyispira Li, 1986 †
- Genus Pingyispira Li, 1986 †
- Genus Plagigeyeria Tomlin, 1930
- Genus Plagiogeyeria Kuščer, 1933
- Genus Platybaicalia Clessin, 1878
- Genus Plesiella Boeters, 2003
- Genus Polinskiola Radoman, 1973
- Genus Pomatiasia Guzhov, 2023 †
- Genus Pontobelgrandiella Radoman, 1978
- Genus Pontohoratia Vinarski, Palatov & Glöer, 2014
- Genus Pontohydrobia Badzoshvili, 1979 †
- Genus Posticobia Iredale, 1943
- Genus Potamogyrus Thiele, 1928 accepted as Potamopyrgus Stimpson, 1865
- Genus Potamopyrgos Paetel, 1888 accepted as Potamopyrgus Stimpson, 1865
- Genus Potamopyrgus Hutton, 1880 accepted as Potamopyrgus Stimpson, 1865
- Genus Powellia Finlay, 1926 † accepted as Onoba H. Adams & A. Adams, 1852
- Genus Prespiana Radoman, 1973 †
- Genus Prespolitorea Radoman, 1973
- Genus Prespopyrgula Radoman, 1973 †
- Genus Pristinicola Hershler, Frest, Johannes, Bowler & Thompson, 1994
- Genus Probythinella Thiele, 1928
- Genus Prososthenia Neumayr, 1869 †
- Genus Pseudamnicola Paulucci, 1878
- Genus Pseudampullaria Ancey, 1898 accepted as Beddomeia Petterd, 1889
- Genus Pseudavenionia Bodon & Guisti, 1982
- Genus Pseudoamnicola Paulucci, 1878 accepted as Pseudamnicola Paulucci, 1878
- Genus Pseudocaspia Starobogatov, 1972
- Genus Pseudodianella Neubauer, Mandic, Harzhauser & Hrvatović, 2013 †
- Genus Pseudohoratia Radoman, 1967
- Genus Pseudoislamia Radoman, 1979
- Genus Pseudopaludinella Mabille, 1877
- Genus Pseudorientalia Radoman, 1983 †
- Genus Pseudotricula Ponder, 1992
- Genus Pseudotryonia Hershler, 2001
- Genus Pterides Pilsbry, 1909
- Genus Pupiphryx Iredale, 1943
- Genus Purgula Polinski, 1929 †
- Genus Pyrgidium Tournouër, 1869 † accepted as Pyrgula de Cristofori & Jan, 1832 †
- Genus Pyrgohydrobia Radoman, 1955
- Genus Pyrgula de Cristofori & Jan, 1832 †
- Genus Pyrgulopsis Call & Pilsbry, 1886
- Genus Radomaniola Szarowska, 2006
- Genus Raphinema
- Genus Rhapinema Thompson, 1970
- Genus Rhodopyrgula Willmann, 1981 †
- Genus Rifia Ghamizi, 2020
- Genus Rivisessor Iredale, 1943 accepted as Austropyrgus Cotton, 1942
- Genus Robicia Brusina, 1897 †
- Genus Romania Cossmann, 1913 †
- Genus Saccoia Brusina, 1893 †
- Genus Sadleriana Clessin, 1887
- Genus Saganoa Kuroda, Habe & Tamu, 1958
- Genus Salaeniella Boeters, Quiñonero-Salgado & Ruiz-Cobo, 2019
- Genus Salakosia Willmann, 1981 †
- Genus Salenthydrobia Wilke, 2003
- Genus Sandria Andrussov, 1890 † accepted as Pseudamnicola Paulucci, 1878
- Genus Sarajana Radoman, 1975 †
- Genus Sardohoratia Manganelli, Bodon, Cianfanelli, Talenti & Giusti, 1998
- Genus Sarkhia Glöer & Pešić, 2012
- Genus Scalimelania Wenz, 1939 †
- Genus Schapsugia Chertoprud, Palatov & Vinarski, 2021
- Genus Sellia Raincourt, 1884 †
- Genus Shadinia Akramovskii, 1976 †
- Genus Similiana Fagot, 1892
- Genus Sitnikovia Chertoprud, Palatov & Vinarski, 2020
- Genus Sivasi Şahin, Koca & Yildirim, 2012
- Genus Soapitia Binder, 1961
- Genus Socenia Jekelius, 1944 †
- Genus Spathogyna Arconada & Ramos, 2002
- Genus Spilochlamys Thompson, 1968
- Genus Staja Brusina, 1897 †
- Genus Stalioa Brusina, 1870 †
- Genus Staliopsis Rzehak, 1893 †
- Genus Stankovicia Polinski, 1929
- Genus Stiobia Thompson & McCaleb, 1978
- Genus Stomatogyrus Cossmann, 1921 accepted as Somatogyrus Gill, 1863
- Genus Stomatopyrgus Dollfus, 1912 accepted as Potamopyrgus Stimpson, 1865
- Genus Strandzhia Georgiev & Glöer, 2013
- Genus Strombopoma Haas, 1955
- Genus Strugia Radoman, 1973
- Genus Sturanyia Radoman, 1962
- Genus Stygobium Grego & Glöer, 2019
- Genus Stygopyrgus Hershler & Longley, 1986
- Genus Subcochliopa Morrison, 1946
- Genus Sulawesidrobia Ponder & Haase, 2005
- Genus Sumia Glöer & Mrkvicka, 2015
- Genus Tachira Chertoprud, Palatov & Vinarski, 2021
- Genus Tanousia Bourguignat, 1881
- Genus Tarraconia Ramos & Arconada in Ramos, Arconada, Rolan & Moreno, 2000
- Genus Tasmaniella Ancey, 1898 accepted as Beddomeia Petterd, 1889
- Genus Taylorconcha Hershler, Frest, Johannes, Bowler & Thompson, 1994
- Genus Tefennia Schütt & Yildirim, 2003
- Genus Tepalcatia Thompson & Hershler, 2002
- Genus Teratobaicalia Dybowski, 1911
- Genus Teratobaikalia Lindholm, 1909
- Genus Terranigra Radoman, 1978
- Genus Terrestribythinella Sitnikova, Starobogatov & Anistratenko, 1992
- Genus Texapyrgus Thompson & Hershler, 1991
- Genus Thalassobia Mabille, 1877 accepted as Hydrobia Hartmann, 1821
- Genus Thibynella Boeters, 2009 accepted as Bythinella Moquin-Tandon, 1856
- Genus Torosia Glöer & Georgiev, 2012
- Genus Tournouerina Schlickum, 1971 †
- Genus Trachyochridia Polinski, 1929
- Genus Trachypyrgula Radoman, 1955
- Genus Travunijana Grego & Glöer, 2019
- Genus Trichonia Schutt, 1980
- Genus Tschernomorica Vinarski & Palatov, 2019
- Genus Turcorientalia Radoman, 1973
- Genus Turicaspia Dybowski & Grochmalicki, 1915 accepted as Turricaspia Dybowski & Grochmalicki, 1917
- Genus Turricaspia Dybowski & Grochmalicki, 1917
- Genus Valvatasma Iredale, 1943 accepted as Beddomeia Petterd, 1889
- Genus Ventrosia Radoman, 1977 accepted as Ecrobia Stimpson, 1865
- Genus Victodrobia Ponder & Clark in Ponder, Clark, Miller & Toluzzi, 1993
- Genus Vinodolia Radoman, 1973 †
- Genus Vioscalba Morrison, 1965
- Genus Vitrella Clessin, 1877 accepted as Bythiospeum Bourguignat, 1882
- Genus Vrazia Brusina, 1897 †
- Genus Westrapyrgus Ponder, Clark & Miller, 1999
- Genus Wuconcha Kang, 1983
- Genus Xestopyrgula Polinski, 1929
- Genus Xestopyrguloides Willmann, 1981 †
- Genus Yaquicoccus Taylor, 1987
- Genus Zaumia Radoman, 1973
- Genus Zeteana Glöer & Pešić, 2014
- Genus Zetikina Morrison, 1947
- Family Hydrococcidae Thiele, 1928
- Family Iravadiidae Thiele, 1928
- Family Lacunidae Gray, 1857 accepted as Littorinidae Gray, 1840
- Family Lamellariidae d'Orbigny, 1841 accepted as Velutinidae Gray, 1840
- Family Lamelliphoridae Korobkov, 1955 †
- Family Laubierinidae Warén, 1990
- Family Lepyriidae Pisbry & Olsson, 1951 accepted as Lithoglyphidae Tryon, 1866
- Family Lippistidae Iredale, 1924 accepted as Capulidae Fleming, 1822
- Family Lironobidae Ponder, 1967
- Family Lithoglyphidae Tryon, 1866
- Family Littorinidae Gray, 1840
- Family Littorinimorpha incertae sedis
- Family Lucmeriidae Gruendel, 2005 †
- Family Lyocyclidae Thiele, 1925
- Family Maturifusidae Gründel, 2001 † accepted as Pseudotritoniidae Golikov & Starobogatov, 1987 †
- Family Melarhaphidae Starobogatov & Sitnikova, 1983 accepted as Littorinidae Gray, 1840
- Family Merriidae Hedley, 1918 accepted as Vanikoridae Gray, 1840
- Family Mesocochliopidae †
- Family Micromelaniidae B. Dybowski & Grochmalicki, 1914 accepted as Hydrobiidae Troschel, 1857
- Family Moitessieriidae Bourguignat, 1863
- Family Naricidae Récluz, 1845 accepted as Vanikoridae Gray, 1840
- Family Naticidae Gray, 1840
- Family Omalaxidae Wenz, 1939 †
- Family Ovulidae Fleming, 1822
- Family Palaeorissoinidae †
- Family Paludestrinidae Newton, 1891 accepted as Hydrobiidae Troschel, 1857
- Family Pediculariidae J.E. Gray, 1853
- Family Pelycidiidae Ponder & Hall, 1983
- Family Personidae Gray, 1854
- Family Pickworthiidae Iredale, 1917
- Family Pisanianuridae Warén, 1990
- Family Pomatiasidae Gray, 1852 accepted as Pomatiidae Newton, 1891
- Family Pomatiidae Newton, 1891
- Family Pomatiopsidae Stimpson, 1865
- Family Pseudosacculidae Kuroda, 1933 accepted as Velutinidae Gray, 1840
- Family Pseudotritoniidae Golikov & Starobogatov, 1987 †
- Family Pterosomatidae Rang, 1829 accepted as Carinariidae Blainville, 1818
- Family Pterotracheidae Oken, 1815
- Family Pugnellidae Kiel & Bandel, 1999 † accepted as Aporrhaidae Gray, 1850
- Family Purpurinidae Zittel, 1895 †
- Family Pyrgulidae Brusina, 1882 accepted as Hydrobiidae Troschel, 1857
- Family Pyrulidae Swainson, 1840 accepted as Ficidae Meek, 1864
- Family Ranellidae Gray, 1854
- Family Rastodentidae Ponder, 1966
- Family Realiidae L. Pfieffer, 1853 accepted as Assimineidae H. Adams & A. Adams, 1856
- Family Reynellonidae Iredale, 1917 accepted as Pickworthiidae Iredale, 1917
- Family Rimellidae Stewart, 1927
- Family Risellidae Kesteven, 1903 accepted as Littorinidae Gray, 1840
- Family Rissoidae Gray, 1847
- Family Rissoidea (awaiting allocation)
- Family Rissoinidae Stimpson, 1865
- Family Rostellariidae Gabb, 1868
- Family Sacculidae Thiele, 1929 accepted as Velutinidae Gray, 1840
- Family Sakarahellidae Bandel, 2006
- Family Seraphidae Gray, 1853 accepted as Seraphsidae Gray, 1853
- Family Seraphsidae Gray, 1853
- Family Skeneopsidae Iredale, 1915
- Family Stenothyridae Fischer, 1885
- Family Strombidae Rafinesque, 1815
- Family Stromboidea incertae sedis
- Family Struthiolariidae Fischer, 1887
- Family Sycotypidae Gray, 1853 accepted as Ficidae Meek, 1864
- Family Tateidae Thiele, 1925
- Family Terebellidae H. Adams & A. Adams, 1854 accepted as Seraphsidae Gray, 1853
- Family Thalassocyonidae F. Riedel, 1995 accepted as Ficidae Meek, 1864
- Family Thersiteidae Savornin, 1914 †
- Family Tibiidae Golikov & Starobogatov, 1975 accepted as Rostellariidae Gabb, 1868
- Family Tonnidae Suter, 1913
- Family Tornidae Sacco, 1896
- Family Trichotropidae Gray, 1850 accepted as Capulidae Fleming, 1822
- Family Tripartellidae †
- Family Triviidae Troschel, 1863
- Family Truncatellidae Gray, 1840
- Family Truncatelloidea (awaiting allocation)
- Family Tylostomatidae Stoliczka, 1868 †
- Family Vanikoridae Gray, 1840
- Family Velutinidae Gray, 1840
- Family Vermetidae Rafinesque, 1815
- Family Vitrinellidae Bush, 1897
- Family Xenophoridae Troschel, 1852
- Family Zebinidae Coan, 1964
- Family Zerotulidae Warén & Hain, 1996
- Genus Olequahia Stewart, 1927 †
- Order Macluritina †
- Order Mesogastropoda
- Order Mimospirida †
- Order Murchisoniina †
- Order Muricoidea
- Order Neogastropoda
- Order Neomphalina incertae sedis
- Order Neotaenioglossa
- Order Neritoina †
- Order Notaspidea
- Order Nudibranchia
- Order Opisthobranchia (awaiting allocation)
- Order Orthogastropoda (awaiting allocation) †
- Order Paragastropoda †
- Order Patellogastropoda
- Order Patellogastropoda incertae sedis
- Order Pleurobranchacea
- Order Pleurobranchomorpha
- Order Prosobranchia (awaiting allocation)
- Order Ptenoglossa
- Order Pulmonata (awaiting allocation)
- Order Pulmonata incertae sedis
- Order Runcinoidea
- Order Sacoglossa
- Order Sorbeoconcha
- Order Stenoglossa
- Order Stylommatophora
- Order Systellommatophora
- Order Thecosomata
- Order Tonnoidea
- Order Umbraculida
- Order Umbraculomorpha
- Class Helcionelloida †
- Class Mollusca (awaiting allocation)
- Class Mollusca incertae sedis
- Class Monoplacophora
- Class Paragastropoda †
- Class Polyplacophora
- Class Rostroconchia †
- Class Scaphopoda
- Class Stenothecoida †
- Class Tentaculita †
- Family Maikhanellidae Missarzhevsky, 1989 †
- Genus Lingulocaris Salter, 1866 †
- Genus Modiolocaris Peach in Jehu & Campbell, 1917 † accepted as Lingulocaris Salter, 1866 †
- Phylum Monoblastozoa accepted as Animalia incertae sedis
- Phylum Nematoda
- Phylum Nematomorpha
- Phylum Nemertea
- Phylum Onychophora
- Phylum Orthonectida
- Phylum Phoronida
- Phylum Placozoa
- Phylum Platyhelminthes
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera
- Phylum Priapula accepted as Priapulida
- Phylum Priapulida
- Phylum Problematica † accepted as Animalia incertae sedis
- Phylum Rhombozoa
- Phylum Rotifera
- Phylum Scalidophora incertae sedis
- Phylum Sipuncula
- Phylum Tardigrada
- Phylum Trace fossils †
- Phylum Vendobionta †
- Phylum Vestimentifera accepted as Siboglinidae Caullery, 1914
- Phylum Vetulicolia †
- Phylum Vinctiplicata incertae sedis †
- Phylum Xenacoelomorpha
- Genus Trilobocaris Pribyl, 1953 †
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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