1. Species Helicostyla (Orthostylus) amaliae (Möllendorff, 1890) accepted as Helicostyla amaliae (Möllendorff, 1890) (unaccepted combination)
2. Species Helicostyla (Orthostylus) aplomorpha (Jonas, 1843) accepted as Helicostyla aplomorpha (Jonas, 1843) (unaccepted combination)
3. Species Helicostyla (Orthostylus) bicolorata (I. Lea, 1840) accepted as Helicostyla bicolorata (I. Lea, 1840) (unaccepted > superseded combination)
4. Species Helicostyla (Orthostylus) caesar (L. Pfeiffer, 1855) accepted as Helicostyla caesar (L. Pfeiffer, 1855) (unaccepted combination)
5. Species Helicostyla (Orthostylus) cunctator (Reeve, 1849) accepted as Helicostyla cunctator (Reeve, 1849) (unaccepted combination)
6. Species Helicostyla (Orthostylus) faunus (Broderip, 1841) accepted as Helicostyla faunus (Broderip, 1841) (unaccepted combination)
7. Species Helicostyla (Orthostylus) fischeri (Hidalgo, 1890) accepted as Dolichostyla fischeri (Hidalgo, 1890) (unaccepted > superseded combination, unaccepted combination)
8. Species Helicostyla (Orthostylus) frater (A. Férussac, 1821) accepted as Helicostyla frater (A. Férussac, 1821) (unaccepted combination)
9. Species Helicostyla (Orthostylus) fulgetra (Broderip, 1841) accepted as Helicostyla fulgetra (Broderip, 1841) (unaccepted > superseded combination)
10. Species Helicostyla (Orthostylus) fulgetrum (Broderip, 1841) accepted as Helicostyla fulgetra (Broderip, 1841) (unaccepted > incorrect grammatical agreement of specific epithet)
11. Species Helicostyla (Orthostylus) gilva (L. Pfeiffer, 1845) accepted as Helicostyla gilva (L. Pfeiffer, 1845) (unaccepted combination)
12. Species Helicostyla (Orthostylus) glaucophthalmus (L. Pfeiffer, 1853) accepted as Helicostyla glaucophthalma (L. Pfeiffer, 1853) (unaccepted combination)
13. Species Helicostyla (Orthostylus) grandis (L. Pfeiffer, 1845) accepted as Helicobulinus grandis (L. Pfeiffer, 1845) (unaccepted > superseded combination)
14. Species Helicostyla (Orthostylus) juglans (L. Pfeiffer, 1842) accepted as Helicostyla juglans (L. Pfeiffer, 1842) (unaccepted > superseded combination)
15. Species Helicostyla (Orthostylus) leopardus (L. Pfeiffer, 1845) accepted as Helicostyla leopardus (L. Pfeiffer, 1845) (unaccepted combination)
16. Species Helicostyla (Orthostylus) leucophaea (G. B. Sowerby I, 1841) accepted as Helicostyla leucophaea (G. B. Sowerby I, 1841) (unaccepted combination)
17. Species Helicostyla (Orthostylus) lignaria (L. Pfeiffer, 1842) accepted as Helicostyla lignaria (L. Pfeiffer, 1842) (unaccepted > superseded combination)
18. Species Helicostyla (Orthostylus) marinduquensis (Hidalgo, 1887) accepted as Helicostyla marinduquensis (Hidalgo, 1887) (unaccepted > superseded combination)
19. Species Helicostyla (Orthostylus) nobilis (Reeve, 1848) accepted as Helicostyla nobilis (Reeve, 1848) (unaccepted combination)
20. Species Helicostyla (Orthostylus) nux (C. Semper, 1877) accepted as Helicostyla nux (C. Semper, 1877) (unaccepted combination)
21. Species Helicostyla (Orthostylus) pictor (Broderip, 1841) accepted as Helicostyla pictor (Broderip, 1841) (unaccepted combination)
22. Species Helicostyla (Orthostylus) pithogastra (A. Férussac, 1821) accepted as Helicostyla pithogaster (A. Férussac, 1821) (unjustifed emendation of species name)
23. Species Helicostyla (Orthostylus) portii (L. Pfeiffer, 1861) accepted as Helicostyla portei (L. Pfeiffer, 1861) (unaccepted > superseded combination)
24. Species Helicostyla (Orthostylus) seckendorffiana (L. Pfeiffer, 1847) accepted as Helicostyla seckendorffiana (L. Pfeiffer, 1847) (unaccepted combination)
25. Species Helicostyla (Orthostylus) solivaga (Reeve, 1849) accepted as Helicostyla solivaga (Reeve, 1849) (unaccepted combination)
26. Species Helicostyla (Orthostylus) subglobosa (I. Lea, 1840) accepted as Helicostyla ticaonica (Broderip, 1841) (junior synonym)
27. Species Helicostyla (Orthostylus) ventricosa (Bruguière, 1792) accepted as Helicostyla ventricosa (Bruguière, 1792) (unaccepted combination)
28. Species Helicostyla (Orthostylus) vidali (Hidalgo, 1887) accepted as Helicostyla vidali (Hidalgo, 1887) (unaccepted combination)
29. Species Helicostyla (Orthostylus) woodiana (I. Lea, 1840) accepted as Helicostyla woodiana (I. Lea, 1840) (unaccepted combination)
30. Species Helicostyla (Orthostylus) daphnis (Broderip, 1841) represented as Helicostyla daphnis (Broderip, 1841)
31. Species Helicostyla (Orthostylus) macrostoma (L. Pfeiffer, 1843) represented as Helicostyla macrostoma (L. Pfeiffer, 1843)
32. Species Helicostyla (Orthostylus) mus (Delessert, 1841) represented as Helicostyla mus (Delessert, 1841)
33. Species Helicostyla (Orthostylus) palawanensis (L. Pfeiffer, 1857) represented as Helicostyla palavanensis (L. Pfeiffer, 1857)
34. Species Helicostyla (Orthostylus) philippinensis (L. Pfeiffer, 1846) represented as Helicostyla philippinensis (L. Pfeiffer, 1846)
35. Species Helicostyla (Orthostylus) pithogaster (A. Férussac, 1821) represented as Helicostyla pithogaster (A. Férussac, 1821)
36. Species Helicostyla (Orthostylus) portei (L. Pfeiffer, 1861) represented as Helicostyla portei (L. Pfeiffer, 1861)
37. Species Helicostyla (Orthostylus) rufogaster (Lesson, 1832) represented as Helicostyla rufogaster (Lesson, 1832)
38. Species Helicostyla (Orthostylus) satyrus (Broderip, 1841) represented as Helicostyla satyrus (Broderip, 1841)
39. Species Helicostyla (Orthostylus) solida (L. Pfeiffer, 1842) represented as Helicostyla solida (L. Pfeiffer, 1842)
40. Species Helicostyla (Orthostylus) ticaonica (Broderip, 1841) represented as Helicostyla ticaonica (Broderip, 1841)
41. Species Helicostyla (Orthostylus) villari (Hidalgo, 1887) represented as Helicostyla villari (Hidalgo, 1887)
42. Species Helicostyla (Orthostylus) imperator (L. Pfeiffer, 1849) accepted as Helicostyla imperator (L. Pfeiffer, 1849) (uncertain > taxon inquirendum)

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