1. Subgenus Leptothyra (Phanerolepida) Dall, 1907 accepted as Phanerolepida Dall, 1907 (original rank)
2. Species Leptothyra africana Bartsch, 1915 accepted as Cinysca spuria (A. Gould, 1861) (unaccepted > junior subjective synonym)
3. Species Leptothyra agulhasensis Thiele, 1925 accepted as Argalista agulhasensis (Thiele, 1925) (unaccepted > superseded combination)
4. Species Leptothyra albocincta W. H. Turton, 1932 accepted as Tricolia striolata (W. H. Turton, 1932)
5. Species Leptothyra alfredensis Bartsch, 1915 accepted as Parviturbo alfredensis (Bartsch, 1915) (original combination)
6. Species Leptothyra arenacea Pritchard & Gatliff, 1902 accepted as Charisma arenacea (Pritchard & Gatliff, 1902)
7. Species Leptothyra carinata Verco, 1907 accepted as Charisma carinata (Verco, 1907)
8. Species Leptothyra carminea Bartsch, 1915 accepted as Microcollonia carminea (Bartsch, 1915) (unaccepted > superseded combination)
9. Species Leptothyra carpenteri Pilsbry, 1889 accepted as Gigahomalopoma carpenteri (Pilsbry, 1889) (unaccepted > superseded combination)
10. Species Leptothyra crassicostata Murdoch, 1905 accepted as Argalista crassicostata (Murdoch, 1905) (unaccepted > superseded combination)
11. Species Leptothyra crassilirata Preston, 1909 accepted as Gigahomalopoma crassilirata (Preston, 1909) (unaccepted > superseded combination)
12. Species Leptothyra delecta E. A. Smith, 1899 accepted as Gigahomalopoma delecta (E. A. Smith, 1899) (unaccepted > superseded combination, original combination)
13. Species Leptothyra engbergi Willett, 1929 accepted as Homalopoma engbergi (Willett, 1929) (original combination)
14. Species Leptothyra eroopolitana (Issel, 1869) accepted as Circumcollonia eroopolitana (Issel, 1869) (unaccepted > superseded combination)
15. Species Leptothyra eucosmia W. H. Turton, 1932 accepted as Cinysca spuria (A. Gould, 1861) (dubious synonym)
16. Species Leptothyra fluctuata (F. W. Hutton, 1883) accepted as Argalista fluctuata (F. W. Hutton, 1883) (superseded combination)
17. Species Leptothyra folini Pilsbry, 1889 accepted as Pulchracollonia folini (Pilsbry, 1889) (unaccepted > superseded combination)
18. Species Leptothyra fugitiva Hedley, 1911 accepted as Argalista fugitiva (Hedley, 1911) (unaccepted > superseded combination)
19. Species Leptothyra gardineri Melvill, 1909 accepted as Neocollonia gardineri (Melvill, 1909) (unaccepted > superseded combination)
20. Species Leptothyra induta (R. B. Watson, 1879) accepted as Homalopoma indutum (R. B. Watson, 1879) (unaccepted > superseded combination)
21. Species Leptothyra inepta (A. Gould, 1861) accepted as Neocollonia inepta (A. Gould, 1861) accepted as Neocollonia pilula (Dunker, 1860) (superseded combination)
22. Species Leptothyra insculpta Dall, 1889 accepted as Homalopoma indutum (R. B. Watson, 1879) (unaccepted > junior subjective synonym)
23. Species Leptothyra juanensis Dall, 1919 accepted as Homalopoma juanensis (Dall, 1919) accepted as Homalopoma luridum (Dall, 1885) accepted as Gigahomalopoma luridum (Dall, 1885)
24. Species Leptothyra laevigata G. B. Sowerby III, 1914 accepted as Glabracollonia laevigata (G. B. Sowerby III, 1914) (unaccepted > superseded combination)
25. Species Leptothyra linnei Dall, 1889 accepted as Homalopoma linnei (Dall, 1889) (original combination)
26. Species Leptothyra lurida Dall, 1885 accepted as Homalopoma luridum (Dall, 1885) accepted as Gigahomalopoma luridum (Dall, 1885)
27. Species Leptothyra panamensis Dall, 1908 accepted as Escondidacantrainea panamensis (Dall, 1908) (unaccepted > superseded combination)
28. Species Leptothyra paucicostata Dall, 1871 accepted as Homalopoma paucicostatum (Dall, 1871) (unaccepted > superseded combination)
29. Species Leptothyra philipiana Dall, 1889 accepted as Thermocollonia philipiana (Dall, 1889) (unaccepted > superseded combination, original combination)
30. Species Leptothyra purpurata (Deshayes, 1863) accepted as Circumcollonia purpurata (Deshayes, 1863) (unaccepted > superseded combination)
31. Species Leptothyra quantilla (A. Gould, 1861) accepted as Microcollonia quantilla (A. Gould, 1861) (superseded combination)
32. Species Leptothyra roseocincta E. von Martens, 1880 accepted as Circumcollonia purpurata (Deshayes, 1863) (unaccepted > junior subjective synonym)
33. Species Leptothyra rotundata (G. B. Sowerby III, 1892) accepted as Microcollonia rotundata (G. B. Sowerby III, 1892) (unaccepted > superseded combination)
34. Species Leptothyra rubra (Dunker, 1882) accepted as Homalopoma nocturnum (A. Gould, 1861) accepted as Gigahomalopoma nocturnum (A. Gould, 1861) (unaccepted > junior subjective synonym)
35. Species Leptothyra sangarensis (Schrenck, 1862) accepted as Gigahomalopoma sangarense (Schrenck, 1861) (unaccepted > superseded combination, )
36. Species Leptothyra sanguinea (Linnaeus, 1758) accepted as Homalopoma sanguineum (Linnaeus, 1758)
37. Species Leptothyra shisuiensis Makiyama, 1927 accepted as Homalopoma shisuiense (Makiyama, 1927)
38. Species Leptothyra sola Barnard, 1963 accepted as Parviturbo sola (Barnard, 1963) (original combination)
39. Species Leptothyra solida Preston, 1908 accepted as Collonista solida (Preston, 1908) (original combination)
40. Species Leptothyra spuria (A. Gould, 1861) accepted as Cinysca spuria (A. Gould, 1861) (superseded combination)
41. Species Leptothyra subconica W. H. Turton, 1932 accepted as Tricolia kochii (R. A. Philippi, 1848) (uncertain synonym)
42. Species Leptothyra tincta Dall, 1889 accepted as Homalopoma indutum (R. B. Watson, 1879) (unaccepted > junior subjective synonym)
43. Species Leptothyra tosaensis Habe, 1953 accepted as Thermocollonia tosaensis (Habe, 1953) (unaccepted > superseded combination)
44. Species Leptothyra annulata W. H. Turton, 1932 (uncertain > taxon inquirendum)
45. Species Leptothyra atomus W. H. Turton, 1932 (uncertain > taxon inquirendum)
46. Species Leptothyra echomenos Barnard, 1963 (uncertain > taxon inquirendum)
47. Species Leptothyra neptuni W. H. Turton, 1932 (uncertain > taxon inquirendum)
48. Species Leptothyra syngenes Barnard, 1963 (uncertain > taxon inquirendum)
49. Species Leptothyra yemenensis Melvill, 1898 (uncertain > unassessed)

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