1. Species Formosana abscedens Hunyadi & Szekeres, 2016
2. Species Formosana albiapex K.-M. Chang & Ookubo, 1994
3. Species Formosana antilopina (Heude, 1885)
4. Species Formosana artifina (Heude, 1885)
5. Species Formosana coudeini (Bavay & Dautzenberg, 1899)
6. Species Formosana dextrogyra (Bavay & Dautzenberg, 1909)
7. Species Formosana elegans (H. Nordsieck, 2012)
8. Species Formosana formosensis (H. Adams, 1866)
9. Species Formosana goniostoma (H. Nordsieck, 2016)
10. Species Formosana hsuehshanensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
11. Species Formosana jianyueae Z.-Y. Chen, 2020
12. Species Formosana kaluluanensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
13. Species Formosana katipulensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
14. Species Formosana kiangshiensis (Gredler, 1892)
15. Species Formosana kongshanensis (H. Nordsieck, 2007)
16. Species Formosana kremeri Grego & Szekeres, 2017
17. Species Formosana libonensis (D.-H. Li, T.-C. Luo & D.-N. Chen, 2003)
18. Species Formosana lilongshanensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
19. Species Formosana lingchuanensis K.-M. Chang, 1989
20. Species Formosana magnaciana (Heude, 1882)
21. Species Formosana malleolata (H. Nordsieck, 2012)
22. Species Formosana moschina (Gredler, 1888)
23. Species Formosana moschinella (H. Nordsieck, 2007)
24. Species Formosana nanaoensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
25. Species Formosana ooharai (H. Nordsieck, 2007)
26. Species Formosana pacifica (Gredler, 1884)
27. Species Formosana psilodonta (Heude, 1889)
28. Species Formosana renzhigangi Grego & Szekeres, 2019
29. Species Formosana ruianensis Z.-J. Xu & M.-W. Cai, 2024
30. Species Formosana schawalleri (H. Nordsieck, 2001)
31. Species Formosana semprinii (Gredler, 1884)
32. Species Formosana splendens (H. Nordsieck, 2005)
33. Species Formosana swinhoei (L. Pfeiffer, 1866)
34. Species Formosana taiwanica (Pilsbry, 1909)
35. Species Formosana telum (H. Nordsieck, 2003)
36. Species Formosana tianchihensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
37. Species Formosana umbrosa (H. Nordsieck, 2007)
38. Species Formosana xinxingae (L. Qiu, 2022)
39. Subgenus Formosana (Dextroformosana) O. Boettger & Schmacker, 1894 accepted as Formosana O. Boettger, 1877
    1. Species Formosana (Dextroformosana) miranda Loosjes & Loosjes-van Bemmel, 1973 accepted as Oospira miranda (Loosjes & Loosjes-van Bemmel, 1973) (original combination)
40. Species Formosana albida K.-M. Chang, 1991 accepted as Formosana formosensis formosensis (H. Adams, 1866) (unaccepted > junior subjective synonym)
41. Species Formosana friniana (Heude, 1890) accepted as Formosanella friniana (Heude, 1890) (unaccepted > superseded combination)
42. Species Formosana lepidospira (Heude, 1889) accepted as Oospira (Paraformosana) lepidospira (Heude, 1889) represented as Oospira lepidospira (Heude, 1889) (unaccepted combination)
43. Species Formosana longispira (Heude, 1885) accepted as Oospira longispina (Heude, 1885) (unaccepted > superseded combination, basionym)
44. Species Formosana lunanensis D.-N. Chen & G.-Q. Zhang, 1999 accepted as Euphaedusa lunanensis (D.-N. Chen & G.-Q. Zhang, 1999) (unaccepted > superseded combination)
45. Species Formosana phyllostoma (Heude, 1888) accepted as Oospira (Paraformosana) phyllostoma (Heude, 1888) represented as Oospira phyllostoma (Heude, 1888) (unaccepted combination)
46. Species Formosana seguiniana (Heude, 1885) accepted as Formosanella seguiniana (Heude, 1885) (unaccepted > superseded combination)
47. Species Formosana timalthea (Sykes, 1898) accepted as Formosana friniana (Heude, 1890) accepted as Formosanella friniana (Heude, 1890) (unaccepted > junior subjective synonym)
48. Subgenus Formosana (Formosana) O. Boettger, 1877 represented as Formosana O. Boettger, 1877
    1. Species Formosana (Formosana) paraformosensis Ehrmann, 1954 accepted as Formosana formosensis hotawana (Pilsbry, 1909) (unaccepted > junior subjective synonym)
    2. Species Formosana (Formosana) coudeini (Bavay & Dautzenberg, 1899) represented as Formosana coudeini (Bavay & Dautzenberg, 1899)
49. Species Formosana gigas (Möllendorff, 1885) (uncertain > taxon inquirendum)

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