1. Family Amnicolidae Tryon, 1863
2. Family Anabathridae Keen, 1971
3. Family Ascorhiidae Ponder, Nimbs & Shea, 2023
4. Family Assimineidae H. Adams & A. Adams, 1856
5. Family Baicaliidae P. Fischer, 1885
6. Family Beddomeiidae Ponder, Nimbs & Shea, 2023
7. Family Bithyniidae J. E. Gray, 1857
8. Family Bythinellidae Locard, 1893
9. Family Caecidae J. E. Gray, 1850
10. Family Caledoniellidae Rosewater, 1969
11. Family Calopiidae Ponder, 1999
12. Family Clenchiellidae D. W. Taylor, 1966
13. Family Cochliopidae Tryon, 1866
14. Family Elachisinidae Ponder, 1985
15. Family Emmericiidae Brusina, 1870
16. Family Epigridae Ponder, 1985
17. Family Erhaiidae G. M. Davis & Y.-H. Kuo, 1985
18. Family Falsicingulidae Slavoshevskaya, 1975
19. Family Fontigentidae D. W. Taylor, 1966
20. Family Hydrobiidae W. Stimpson, 1865
21. Family Hydrococcidae Thiele, 1928
22. Family Iravadiidae Thiele, 1928
23. Family Lithoglyphidae Tryon, 1866
24. Family Litthabitellidae Falniowski & Hofman, 2023
25. Family Mesocochliopidae X.-H. Yu, 1987 †
26. Family Moitessieriidae Bourguignat, 1864
27. Family Palaeobaicaliidae Sitnikova & Vinarski, 2023 †
28. Family Pomatiopsidae W. Stimpson, 1865
29. Family Spirostyliferinidae Layton, Middelfart, Tatarnic & N. G. Wilson, 2019
30. Family Squamapicidae L.-J. Zhang & von Rintelen, 2024
31. Family Stenothyridae Tryon, 1866
32. Family Tateidae Thiele, 1925
33. Family Teinostomatidae Cossmann, 1917
34. Family Tomichiidae Wenz, 1938
35. Family Tornidae Sacco, 1896 (1884)
36. Family Truncatellidae J. E. Gray, 1840
37. Family Vitrinellidae K. J. Bush, 1897
38. Family Adeorbidae Monterosato, 1884 accepted as Tornidae Sacco, 1896 (1884) (synonym)
39. Family Benedictiidae Clessin, 1880 accepted as Benedictiinae Clessin, 1880 (new rank)
40. Family Circulidae Fretter & Graham, 1962 accepted as Vitrinellidae K. J. Bush, 1897
41. Family Coxiellidae Iredale, 1943 accepted as Tomichiidae Wenz, 1938 (unaccepted > junior subjective synonym)
42. Family Ctiloceratidae Iredale & Laseron, 1957 accepted as Ctiloceratinae Iredale & Laseron, 1957
43. Family Cyclotropidae Iredale, 1941 accepted as Ekadantinae Thiele, 1929
44. Family Fairbankiinae Thiele, 1928 accepted as Iravadiidae Thiele, 1928
45. Subfamily Fontigentinae D. W. Taylor, 1966 accepted as Fontigentidae D. W. Taylor, 1966 (unaccepted > superseded rank)
46. Family Helicostoidae Pruvot-Fol, 1937 accepted as Helicostoinae Pruvot-Fol, 1937 (unaccepted > superseded rank)
47. Subfamily Hemistomiinae Thiele, 1929 accepted as Tateidae Thiele, 1925
48. Family Hyalidae A. N. Golikov & Starobogatov, 1975 accepted as Iravadiidae Thiele, 1928
49. Family Kolhymamnicolidae Starobogatov, 1983 accepted as Amnicolinae Tryon, 1863 accepted as Amnicolidae Tryon, 1863
50. Family Limnoreidae B. Dybowski, 1911 accepted as Baicaliidae P. Fischer, 1885 (invalid: type genus a junior homonym)
51. Family Lithoglyphulidae Radoman, 1973 accepted as Horatiinae D. W. Taylor, 1966
52. Family Micromelaniidae B. Dybowski & Grochmalicki, 1913 accepted as Pyrgulinae Brusina, 1882
53. Family Micropyrgulidae Radoman, 1973 accepted as Pyrgulinae Brusina, 1882
54. Family Orientaliidae Radoman, 1973 accepted as Horatiinae D. W. Taylor, 1966
55. Family Orientalinidae Radoman, 1978 accepted as Horatiinae D. W. Taylor, 1966
56. Subfamily Orientalininae Radoman, 1978 accepted as Horatiinae D. W. Taylor, 1966 (a junior synonym)
57. Family Paludestrinidae R. B. Newton, 1891 accepted as Eatoniellidae Ponder, 1965
58. Family Paludinellidae T. Habe, 1976 accepted as Ekadantinae Thiele, 1929 (unavailable name: no description)
59. Family Potamopyrgidae F. C. Baker, 1928 accepted as Tateidae Thiele, 1925
60. Family Pseudomerelininae Starobogatov, 1989 accepted as Iravadiidae Thiele, 1928
61. Family Pyrgulidae Brusina, 1882 (1869) accepted as Hydrobiidae W. Stimpson, 1865
62. Subfamily Stenothyrinae Tryon, 1866 accepted as Stenothyridae Tryon, 1866 (original rank)
63. Family Synceratidae Bartsch, 1920 accepted as Assimineinae H. Adams & A. Adams, 1856
64. Family Tanousiidae Starobogatov, 1983 accepted as Horatiinae D. W. Taylor, 1966
65. Family Terrestribythinellidae Sitnikova, Starobogatov & V. V. Anistratenko, 1992 accepted as Bythinellidae Locard, 1893 (unaccepted > junior subjective synonym)
66. Subfamily Tomichiinae Wenz, 1938 accepted as Tomichiidae Wenz, 1938 (original rank)
67. Family Tutuilanidae Hubendick, 1952 accepted as Omphalotropidinae Thiele, 1927 (unaccepted > junior subjective synonym)
68. Family Truncatelloidea incertae sedis (temporary name)

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