1. Subgenus Bifidaria (Bensonella) Pilsbry & Vanatta, 1900 accepted as Bensonella Pilsbry & Vanatta, 1900
   1. Species Bifidaria (Bensonella) landurensis Pilsbry, 1915 accepted as Bensonella plicidens (W. H. Benson, 1849) (unaccepted > junior subjective synonym, original combination)
2. Subgenus Bifidaria (Chaenaxis) Pilsbry & Ferris, 1906 accepted as Chaenaxis Pilsbry & Ferriss, 1906 (original rank)
   1. Species Bifidaria (Chaenaxis) tuba Pilsbry & Ferriss, 1906 accepted as Chaenaxis tuba (Pilsbry & Ferriss, 1906) (unaccepted > superseded combination)
3. Subgenus Bifidaria (Immersidens) Pilsbry & Vanatta, 1900 accepted as Gastrocopta (Immersidens) Pilsbry & Vanatta, 1900 represented as Gastrocopta Wollaston, 1878
4. Species Bifidaria agna Pilsbry & Vanatta, 1907 accepted as Gastrocopta holzingeri (Sterki, 1889) (junior synonym)
5. Species Bifidaria armifera (Say, 1821) accepted as Gastrocopta armifera (Say, 1821) (unaccepted combination)
6. Species Bifidaria armigerella (Reinhardt, 1877) accepted as Gastrocopta armigerella (Reinhardt, 1877)
7. Species Bifidaria ashmuni Sterki, 1898 accepted as Gastrocopta ashmuni (Sterki, 1898) (original combination)
8. Species Bifidaria bannertonensis Gabriel, 1930 accepted as Gastrocopta bannertonensis (Gabriel, 1930) (original combination)
9. Species Bifidaria bilamellata Sterki & G. H. Clapp, 1909 accepted as Gastrocopta dalliana bilamellata (Sterki & G. H. Clapp, 1909) (original combination)
10. Species Bifidaria carnegiei Sterki, 1916 accepted as Gastrocopta tappaniana (C. B. Adams, 1841)
11. Species Bifidaria clappi Sterki, 1909 accepted as Gastrocopta clappi (Sterki, 1909) (unaccepted > superseded combination)
12. Species Bifidaria clementina (Sterki, 1890) accepted as Sterkia clementina (Sterki, 1890) accepted as Vertigo clementina (Sterki, 1890)
13. Species Bifidaria cochisensis Pilsbry & Ferriss, 1910 accepted as Gastrocopta cochisensis (Pilsbry & Ferriss, 1910) (original combination)
14. Species Bifidaria contracta (Say, 1822) accepted as Gastrocopta contracta (Say, 1822) (unaccepted combination)
15. Species Bifidaria dalliana Sterki, 1898 accepted as Gastrocopta dalliana (Sterki, 1898) (original combination)
16. Species Bifidaria duplicata Sterki, 1912 accepted as Gastrocopta sterkiana Pilsbry, 1917
17. Species Bifidaria hebes (Ancey, 1881) accepted as Pupilla hebes (Ancey, 1881) (unaccepted combination)
18. Species Bifidaria holzingeri (Sterki, 1889) accepted as Gastrocopta holzingeri (Sterki, 1889) (unaccepted combination)
19. Species Bifidaria hordeacella (Pilsbry, 1890) accepted as Gastrocopta pellucida hordeacella (Pilsbry, 1890) (unaccepted > superseded combination)
20. Species Bifidaria mcclungi G. D. Hanna & E. C. Johnston, 1913 accepted as Gastrocopta procera (A. Gould, 1840)
21. Species Bifidaria minuta Sterki, 1916 accepted as Gastrocopta tappaniana (C. B. Adams, 1841) (junior synonym)
22. Species Bifidaria pediculus (Shuttleworth, 1852) accepted as Gastrocopta pediculus (Shuttleworth, 1852) (unaccepted > superseded combination)
23. Species Bifidaria pellucida (L. Pfeiffer, 1841) accepted as Gastrocopta pellucida (L. Pfeiffer, 1841) (unaccepted combination)
24. Species Bifidaria pentodon (Say, 1822) accepted as Gastrocopta pentodon (Say, 1822) (unaccepted combination)
25. Species Bifidaria perversa Sterki, 1898 accepted as Gastrocopta ashmuni (Sterki, 1898) (junior synonym)
26. Species Bifidaria pilsbryana (Sterki, 1890) accepted as Gastrocopta pilsbryana (Sterki, 1890) (unaccepted combination)
27. Species Bifidaria plicidens (W. H. Benson, 1849) accepted as Bensonella plicidens (W. H. Benson, 1849) (unaccepted combination)
28. Species Bifidaria procera (A. Gould, 1840) accepted as Gastrocopta procera (A. Gould, 1840) (unaccepted combination)
29. Species Bifidaria prototypus Pilsbry, 1899 accepted as Gastrocopta prototypus (Pilsbry, 1899) (original combination)
30. Species Bifidaria quadridentata Sterki, 1899 accepted as Gastrocopta quadridens Pilsbry, 1916 (junior homonym of Pupa quadridentata Klein, 1853; Gastrocopta quadridens Pilsbry, 1916 is replacement name.)
31. Species Bifidaria recondita (Tapparone Canefri, 1883) accepted as Gastrocopta recondita (Tapparone Canefri, 1883) (unaccepted > superseded combination)
32. Species Bifidaria rhoadsi Pilsbry, 1899 accepted as Sterkia eyriesii (Drouët, 1859) accepted as Vertigo eyriesii (Drouët, 1859) (junior synonym)
33. Species Bifidaria riograndensis Pilsbry & Vanatta, 1900 accepted as Gastrocopta riograndensis (Pilsbry & Vanatta, 1900) (original combination)
34. Species Bifidaria rupicola (Say, 1821) accepted as Gastrocopta rupicola (Say, 1821) (unaccepted combination)
35. Species Bifidaria servilis (A. Gould, 1843) accepted as Gastrocopta servilis (A. Gould, 1843) (unaccepted combination)
36. Species Bifidaria tappaniana (C. B. Adams, 1841) accepted as Gastrocopta tappaniana (C. B. Adams, 1841) (unaccepted combination)
37. Species Bifidaria tuba Pilsbry & Ferriss, 1906 accepted as Chaenaxis tuba (Pilsbry & Ferriss, 1906) (original combination)

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