1. Species Lacuna crassior (Montagu, 1803)
2. Species Lacuna pallidula (da Costa, 1778)
3. Species Lacuna parva (da Costa, 1778)
4. Species Lacuna vincta (Montagu, 1803)
5. Subgenus Lacuna (Epheria) Leach, 1847 accepted as Lacuna W. Turton, 1827
   1. Species Lacuna (Epheria) cancavennensis Martel, 1914 (uncertain > taxon inquirendum)
6. Species Lacuna abyssorum Locard, 1896 accepted as Benthonella tenella (Jeffreys, 1869) (synonym)
7. Species Lacuna albella Lovén, 1846 accepted as Lacuna vincta (Montagu, 1803) (synonym)
8. Species Lacuna arctica R. A. Philippi, 1853 accepted as Lacuna vincta (Montagu, 1803) (unaccepted > junior subjective synonym)
9. Species Lacuna azonata Locard, 1886 accepted as Megalomphalus azoneus (Brusina, 1865) (unaccepted > unjustified emendation, of Stomatia azonea Brusina, 1865)
10. Species Lacuna bourguignati Rochebrune, 1882 accepted as Fossarus ambiguus (Linnaeus, 1758)
11. Species Lacuna carinata A. Gould, 1848 accepted as Lacuna vincta (Montagu, 1803) (junior subjective synonym)
12. Species Lacuna cossmanni Locard, 1897 accepted as Benthobia tryonii Dall, 1889 (unaccepted > junior subjective synonym)
13. Species Lacuna frigida Lovén, 1846 accepted as Lacuna vincta (Montagu, 1803) (synonym)
14. Species Lacuna glacialis Møller, 1842 accepted as Lacuna crassior (Montagu, 1803) (synonym)
15. Species Lacuna gracilior Metcalfe, 1844 accepted as Lacuna vincta (Montagu, 1803) (synonym)
16. Species Lacuna intermedia Locard, 1886 accepted as Lacuna parva (da Costa, 1778) (synonym)
17. Species Lacuna labiosa Lovén, 1846 accepted as Lacuna vincta (Montagu, 1803) (synonym)
18. Species Lacuna mediterranea Monterosato, 1869 accepted as Ersilia mediterranea (Monterosato, 1869) (original combination)
19. Species Lacuna neritoidea A. Gould, 1840 accepted as Lacuna pallidula (da Costa, 1778) (junior subjective synonym)
20. Species Lacuna patula Thorpe, 1844 accepted as Lacuna pallidula (da Costa, 1778) (synonym)
21. Species Lacuna pertusa Conrad, 1831 accepted as Lacuna vincta (Montagu, 1803) (synonym)
22. Species Lacuna puteolina Locard, 1886 accepted as Lacuna parva (da Costa, 1778) (synonym)
23. Species Lacuna puteolus (W. Turton, 1819) accepted as Lacuna parva (da Costa, 1778) (synonym)
24. Species Lacuna solidula Lovén, 1846 accepted as Lacuna vincta (Montagu, 1803) (unaccepted > junior subjective synonym)
25. Species Lacuna tenella Jeffreys, 1869 accepted as Benthonella tenella (Jeffreys, 1869)
26. Species Lacuna vestita Dunker & Metzger, 1875 accepted as Lacuna crassior (Montagu, 1803) (synonym)

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