1. Species Diastoma acuminiense Cossmann, 1882 †
2. Species Diastoma adelaidense Ludbrook, 1971 †
3. Species Diastoma costellatum (Lamarck, 1804) †
4. Species Diastoma grateloupi (A. d'Orbigny, 1852) †
5. Species Diastoma hypermeces Cossmann, 1919 †
6. Species Diastoma inerme Deshayes, 1861 †
7. Species Diastoma interruptum Deshayes, 1861 †
8. Species Diastoma melanioides (Reeve, 1849)
9. Species Diastoma multispiratum Cossmann, 1881 †
10. Species Diastoma provisi Tate, 1894 †
11. Species Diastoma subinterruptum Lozouet, 1999 †
12. Species Diastoma ultimum Cossmann & Peyrot, 1922 †
13. Species Diastoma variculosum Deshayes, 1861 †
14. Species Diastoma alternatum (Say, 1822) accepted as Bittiolum alternatum (Say, 1822) (chresonym)
15. Species Diastoma biarritzense Oppenheim, 1906 † accepted as Diastoma costellatum (Lamarck, 1804) †
16. Species Diastoma hispanicum Cossmann, 1906 † accepted as Diastoma costellatum (Lamarck, 1804) † (unaccepted > junior subjective synonym)
17. Species Diastoma varium (L. Pfeiffer, 1840) accepted as Bittiolum varium (L. Pfeiffer, 1840) (chresonym)
18. Species Diastoma virginica J. B. Henderson & Bartsch, 1914 accepted as Bittiolum alternatum (Say, 1822) (unaccepted > junior subjective synonym)
19. Species Diastoma aciculatum Cossmann, 1906 † (uncertain > unassessed)
20. Species Diastoma chrysalloidea Bartsch, 1911 (uncertain > taxon inquirendum)
21. Species Diastoma crassicostatum Doncieux, 1908 † (uncertain > unassessed)
22. Species Diastoma daralagesica Aslanjan, 1960 † (uncertain > taxon inquirendum)
23. Species Diastoma ornatum Douvillé, 1916 † (uncertain > unassessed)
24. Species Diastoma slevini A. M. Strong, 1938 (uncertain > taxon inquirendum)

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