1. Species Hydrobia aciculina (Bourguignat, 1876)
2. Species Hydrobia acuta (Draparnaud, 1805)
3. Species Hydrobia djerbaensis Wilke, Pfenninger & G. M. Davis, 2002
4. Species Hydrobia euryomphala (Bourguignat, 1876)
5. Species Hydrobia glyca (Servain, 1880)
6. Species Hydrobia knysnaensis (Krauss, 1848)
7. Subgenus Hydrobia (Caspia) Clessin & W. Dybowski, 1887 accepted as Caspia Clessin & W. Dybowski, 1887
8. Subgenus Hydrobia (Litorinella) A. Braun, 1843 accepted as Hydrobia W. Hartmann, 1821 (unaccepted > junior objective synonym)
9. Subgenus Hydrobia (Littorinella) [sic] accepted as Hydrobia W. Hartmann, 1821 (incorrect subsequent spelling of Litorinella Braun, 1843 by Herrmannsen (1847))
10. Subgenus Hydrobia (Peringia) Paladilhe, 1874 accepted as Peringia Paladilhe, 1874 (considered a separate genus)
11. Species Hydrobia atuca Boeters, 1988 accepted as Ecrobia atuca (Boeters, 1988) (basionym)
12. Species Hydrobia booneae J. P. E. Morrison, 1973 accepted as Texadina barretti (J. P. E. Morrison, 1965) (unnecessary new name for Odostomia barretti Morrison, 1965, non Odostomia barreti Morelet, 1885)
13. Species Hydrobia caledonensis Chaper, 1885 accepted as Tomichia ventricosa (Reeve, 1842) (junior synonym)
14. Species Hydrobia californica Tryon, 1865 accepted as Angustassiminea californica (Tryon, 1865)
15. Species Hydrobia caliginosa (A. Gould, 1849) accepted as Laevilitorina caliginosa (A. Gould, 1849) (superseded combination)
16. Species Hydrobia canariensis Mousson, 1872 accepted as Eupaludestrina canariensis (Mousson, 1872) (original name)
17. Species Hydrobia chrysopsis V. P. Kolesnikov, 1947 accepted as Caspiohydrobia chrysopsis (V. P. Kolesnikov, 1947) (basionym)
18. Species Hydrobia cissana Radoman, 1973 accepted as Ecrobia ventrosa (Montagu, 1803)
19. Species Hydrobia compacta Jeffreys, 1884 accepted as Barleeia gougeti (Michaud, 1830) (synonym)
20. Species Hydrobia compacta P. P. Carpenter, 1864 accepted as Assiminea compacta (P. P. Carpenter, 1864)
21. Species Hydrobia consociella Frauenfeld, 1863 accepted as Radomaniola curta (Küster, 1853) (unaccepted > junior subjective synonym)
22. Species Hydrobia georgiana Pfeffer, 1886 accepted as Eatoniella georgiana (Pfeffer, 1886) (original combination)
23. Species Hydrobia grimmi Clessin, 1887 accepted as Ecrobia grimmi (Clessin, 1887) (unaccepted > superseded combination)
24. Species Hydrobia joossei van Aartsen, Menkhorst & E. Gittenberger, 1984 accepted as Hydrobia glyca (Servain, 1880) (synonym)
25. Species Hydrobia kurilensis (Pilsbry, 1905) accepted as Falsicingula kurilensis (Pilsbry, 1905) (unaccepted > superseded combination)
26. Species Hydrobia limosa (Preston, 1915) accepted as Littoridina limosa Preston, 1915
27. Species Hydrobia macei Paladilhe, 1867 accepted as Eupaludestrina macei (Paladilhe, 1867) (original name)
28. Species Hydrobia maritima Milaschewitsch, 1916 accepted as Ecrobia maritima (Milaschewitsch, 1916)
29. Species Hydrobia minuta (Totten, 1834) accepted as Ecrobia truncata (Vanatta, 1924) (preoccupied name)
30. Species Hydrobia monroensis Frauenfeld, 1863 accepted as Littoridinops monroensis (Frauenfeld, 1863) (unaccepted > superseded combination)
31. Species Hydrobia musaensis (Frauenfeld, 1856) accepted as Eupaludestrina musaensis (Frauenfeld, 1856) (unaccepted > superseded combination)
32. Species Hydrobia neglecta Muus, 1963 accepted as Hydrobia acuta neglecta Muus, 1963 (considered as a subspecies of H. acuta)
33. Species Hydrobia newtoni (Gude, 1913) accepted as Caspiohydrobia eichwaldiana (A. N. Golikov & Starobogatov, 1966) (synonym)
34. Species Hydrobia plicosa E. A. Smith, 1875 accepted as Pusillina plicosa (E. A. Smith, 1875) (original combination)
35. Species Hydrobia pontieuxini Radoman, 1973 accepted as Ecrobia maritima (Milaschewitsch, 1916)
36. Species Hydrobia procerula (Paladilhe, 1869) accepted as Hydrobia acuta acuta (Draparnaud, 1805)
37. Species Hydrobia pumilio E. A. Smith, 1877 accepted as Laevilacunaria pumilio (E. A. Smith, 1877) (unaccepted > superseded combination)
38. Species Hydrobia salaria (Radoman, 1977) accepted as Hydrobia acuta acuta (Draparnaud, 1805) (a junior synonym)
39. Species Hydrobia salsa (Pilsbry, 1905) accepted as Spurwinkia salsa (Pilsbry, 1905) (unaccepted > superseded combination)
40. Species Hydrobia savesi Crosse, 1888 accepted as Assiminea savesi (Crosse, 1888) (original combination)
41. Species Hydrobia scamandri Boeters, Monod & Vala, 1977 accepted as Eupaludestrina scamandri (Boeters, Monod & Vala, 1977) (original name)
42. Species Hydrobia spalatiana Radoman, 1973 accepted as Ecrobia spalatiana (Radoman, 1973) (original combination)
43. Species Hydrobia stagnorum (Gmelin, 1791) accepted as Eupaludestrina stagnorum (Gmelin, 1791) (synonym)
44. Species Hydrobia striata (A. d'Orbigny, 1841) accepted as Onoba amissa Ponder & Worsfold, 1994
45. Species Hydrobia tasmanica E. von Martens, 1858 accepted as Ascorhis tasmanica (E. von Martens, 1858) (unaccepted > superseded combination)
46. Species Hydrobia testadura (Radoman, 1974) accepted as Hydrobia acuta acuta (Draparnaud, 1805) (a junior synonym)
47. Species Hydrobia totteni J. P. E. Morrison, 1954 accepted as Ecrobia truncata (Vanatta, 1924) (synonym)
48. Species Hydrobia tristis Morelet, 1889 accepted as Tomichia tristis (Morelet, 1889) (unaccepted > superseded combination)
49. Species Hydrobia truncata (Vanatta, 1924) accepted as Ecrobia truncata (Vanatta, 1924)
50. Species Hydrobia turbinata Petterd, 1889 accepted as Ascorhis tasmanica (E. von Martens, 1858) (junior synonym)
51. Species Hydrobia ulvae (Pennant, 1777) accepted as Peringia ulvae (Pennant, 1777)
52. Species Hydrobia ventrosa (Montagu, 1803) accepted as Ecrobia ventrosa (Montagu, 1803) (unaccepted > superseded combination)
53. Species Hydrobia victoriae (Tenison Woods, 1878) accepted as Ascorhis victoriae (Tenison Woods, 1878) accepted as Ascorhis tasmanica (E. von Martens, 1858)
54. Species Hydrobia antarctica R. A. Philippi, 1868 (uncertain > nomen dubium)
55. Species Hydrobia erythraea E. von Martens, 1858 (uncertain > taxon inquirendum)
56. Species Hydrobia evanescens de Guerne, 1888 (uncertain > nomen dubium)
57. Species Hydrobia mabilli (Bourguignat, 1876) (uncertain > taxon inquirendum)

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