1. Species Otostomus signatus (Spix, 1827)
2. Subgenus Otostomus (Charis) Albers, 1850 accepted as Callistocharis Pilsbry, 1900 (unaccepted > junior homonym)
   1. Species Otostomus (Charis) fulguratus (J. C. Jay, 1842) accepted as Callistocharis fulguratus (J. C. Jay, 1842) (unaccepted > superseded combination)
3. Subgenus Otostomus (Drymaeus) Albers, 1850 accepted as Drymaeus Albers, 1850
   1. Species Otostomus (Drymaeus) lilacinus (Reeve, 1849) accepted as Drymaeus lilacinus (Reeve, 1849)
   2. Species Otostomus (Drymaeus) petasites K. Miller, 1878 accepted as Drymaeus petasites (K. Miller, 1878) (original combination)
4. Subgenus Otostomus (Liostracus) [sic] accepted as Leiostracus Albers, 1850 (unaccepted > superseded combination)
   1. Species Otostomus (Liostracus) vittatus (Spix, 1827) accepted as Leiostracus vittatus (Spix, 1827) (unaccepted > superseded combination)
5. Subgenus Otostomus (Mormus) E. von Martens, 1860 accepted as Drymaeus (Drymaeus) Albers, 1850 represented as Drymaeus Albers, 1850 (junior synonym)
   1. Species Otostomus (Mormus) occidentalis K. Miller, 1879 accepted as Drymaeus cactivorus (Broderip, 1832) accepted as Mesembrinus cactivorus (Broderip, 1832) (unaccepted > junior subjective synonym)
   2. Species Otostomus (Mormus) papyraceus (Mawe, 1823) accepted as Drymaeus papyraceus (Mawe, 1823) (unaccepted > superseded combination)
   3. Species Otostomus (Mormus) catamayensis K. Miller, 1879 (uncertain > taxon inquirendum, status in recent literature not researched by editor)
6. Subgenus Otostomus (Neopetraeus) E. von Martens, 1885 accepted as Neopetraeus E. von Martens, 1885 (unaccepted > superseded rank)
7. Subgenus Otostomus (Pelecychilus) [sic] accepted as Plekocheilus Guilding, 1827 (unaccepted > misspelling - incorrect subsequent spelling)
   1. Species Otostomus (Pelecychilus) distortus (Bruguière, 1789) accepted as Plekocheilus distortus (Bruguière, 1789) (unaccepted > misspelling - incorrect subsequent spelling)
8. Subgenus Otostomus (Placostylus) H. Beck, 1837 accepted as Placostylus H. Beck, 1837 (unaccepted > superseded combination)
   1. Species Otostomus (Placostylus) elobatus (A. Gould, 1846) accepted as Callistocharis elobatus (A. Gould, 1846) (unaccepted > superseded combination)
   2. Species Otostomus (Placostylus) seemanui [sic] accepted as Euplacostylus seemanni (Dohrn, 1861) (unaccepted > misspelling - incorrect subsequent spelling)
9. Species Otostomus alternans (H. Beck, 1837) accepted as Drymaeus alternans (H. Beck, 1837) (unaccepted > superseded combination)
10. Species Otostomus attenuatus (L. Pfeiffer, 1853) accepted as Mesembrinus attenuatus (L. Pfeiffer, 1853) (unaccepted > superseded combination)
11. Species Otostomus bartletti H. Adams, 1867 accepted as Drymaeus bartletti (H. Adams, 1867) (original combination)
12. Species Otostomus bugabensis E. von Martens, 1893 accepted as Mesembrinus bugabensis (E. von Martens, 1893) (original combination)
13. Species Otostomus castus (L. Pfeiffer, 1847) accepted as Drymaeus castus (L. Pfeiffer, 1847) (unaccepted > superseded combination)
14. Species Otostomus championi E. von Martens, 1893 accepted as Mesembrinus championi (E. von Martens, 1893) (original combination)
15. Species Otostomus chiapensis (L. Pfeiffer, 1866) accepted as Drymaeus chiapasensis (L. Pfeiffer, 1866) (unaccepted > misspelling - incorrect subsequent spelling)
16. Species Otostomus colimensis Rolle, 1895 accepted as Drymaeus colimensis (Rolle, 1895) (original combination)
17. Species Otostomus delattrei (L. Pfeiffer, 1846) accepted as Drymaeus lattrei (L. Pfeiffer, 1846) (incorrect subsequent spelling)
18. Species Otostomus depictus (Reeve, 1849) accepted as Drymaeus depictus (Reeve, 1849) accepted as Mesembrinus depictus (Reeve, 1849)
19. Species Otostomus emeus (Say, 1829) accepted as Drymaeus emeus (Say, 1829) accepted as Mesembrinus emeus (Say, 1829)
20. Species Otostomus fenestrellus (E. von Martens, 1863) accepted as Drymaeus fenestrellus (E. von Martens, 1863) accepted as Mesembrinus fenestrellus (E. von Martens, 1863)
21. Species Otostomus ghiesbreghti (L. Pfeiffer, 1866) accepted as Mesembrinus ghiesbreghti (L. Pfeiffer, 1866) (unaccepted > superseded combination)
22. Species Otostomus josephus (Angas, 1878) accepted as Drymaeus josephus (Angas, 1878) (unaccepted > superseded combination)
23. Species Otostomus lilacinus (Reeve, 1849) accepted as Drymaeus lilacinus (Reeve, 1849)
24. Species Otostomus liliaceus (A. Férussac, 1832) accepted as Drymaeus liliaceus (A. Férussac, 1832) accepted as Mesembrinus liliaceus (A. Férussac, 1832) (unaccepted combination)
25. Species Otostomus loxanus E. T. Higgins, 1872 accepted as Mesembrinus loxanus (E. T. Higgins, 1872) (original combination)
26. Species Otostomus melanoscolops Dohrn, 1882 accepted as Leiostracus melanoscolops (Dohrn, 1882) (original combination)
27. Species Otostomus millegranus E. von Martens, 1885 accepted as Neopetraeus catamarcanus (L. Pfeiffer, 1858) (unaccepted > junior subjective synonym)
28. Species Otostomus moritinctus E. von Martens, 1893 accepted as Mesembrinus moritinctus (E. von Martens, 1893) (original combination)
29. Species Otostomus nigrogularis Dohrn, 1882 accepted as Drymaeus nigrogularis (Dohrn, 1882) (original combination)
30. Species Otostomus pulcherrimus H. Adams, 1867 accepted as Drymaeus pulcherrimus (H. Adams, 1867) accepted as Mesembrinus pulcherrimus (H. Adams, 1867) (original combination)
31. Species Otostomus recluzianus (L. Pfeiffer, 1847) accepted as Drymaeus recluzianus (L. Pfeiffer, 1847) accepted as Mesembrinus recluzianus (L. Pfeiffer, 1847) (unaccepted > superseded combination)
32. Species Otostomus sachsei (Albers, 1854) accepted as Mesembrinus sachsei (Albers, 1854) (unaccepted > superseded combination)
33. Species Otostomus sargi (Crosse & P. Fischer, 1875) accepted as Drymaeus sargi (Crosse & P. Fischer, 1875) accepted as Mesembrinus sargi (Crosse & P. Fischer, 1875) (unaccepted > superseded combination)
34. Species Otostomus scitus H. Adams, 1867 accepted as Drymaeus expansus scitus (H. Adams, 1867) (unaccepted > superseded combination)
35. Species Otostomus sulfureus (L. Pfeiffer, 1857) accepted as Drymaeus sulphureus (L. Pfeiffer, 1857) accepted as Antidrymaeus sulphureus (L. Pfeiffer, 1857)
36. Species Otostomus trimarianus E. von Martens, 1893 accepted as Mesembrinus trimarianus (E. von Martens, 1893) (original combination)
37. Species Otostomus tripictus (Albers, 1857) accepted as Drymaeus tripictus (Albers, 1857) accepted as Mesembrinus tripictus (Albers, 1857)
38. Species Otostomus uhdeanus (E. von Martens, 1863) accepted as Mesembrinus uhdeanus (E. von Martens, 1863) (unaccepted > superseded combination)
39. Species Otostomus venezuelensis E. von Martens, 1893 accepted as Drymaeus membranaceus (R. A. Philippi, 1846) accepted as Mesembrinus membranaceus (R. A. Phillipi, 1846) (junior synonym)
40. Subgenus Otostomus (Otostomus) H. Beck, 1837 represented as Otostomus H. Beck, 1837
    1. Species Otostomus (Otostomus) aurisleporis (Bruguière, 1792) accepted as Cochlorina aurisleporis (Bruguière, 1792) (unaccepted > superseded combination)

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