1. Species Opisthostoma (Plectostoma) aethoderma Vermeulen, 1994 accepted as Plectostoma aethoderma (Vermeulen, 1994) (original combination)
2. Species Opisthostoma (Plectostoma) anisopterum Vermeulen, 1994 accepted as Plectostoma anisopterum (Vermeulen, 1994) (original combination)
3. Species Opisthostoma (Plectostoma) austeni E. A. Smith, 1894 accepted as Plectostoma austeni (E. A. Smith, 1894)
4. Species Opisthostoma (Plectostoma) baritense E. A. Smith, 1893 accepted as Plectostoma baritense (E. A. Smith, 1893)
5. Species Opisthostoma (Plectostoma) bihamulatum Vermeulen, 1994 accepted as Plectostoma bihamulatum (Vermeulen, 1994) (unaccepted > superseded combination, basionym)
6. Species Opisthostoma (Plectostoma) brevituba Vermeulen, 1994 accepted as Plectostoma brevituba (Vermeulen, 1994) (original combination)
7. Species Opisthostoma (Plectostoma) busauense E. A. Smith, 1893 accepted as Plectostoma wallacei busauense (E. A. Smith, 1893) (unaccepted combination and rank)
8. Species Opisthostoma (Plectostoma) charasense Tomlin, 1948 accepted as Plectostoma charasense (Tomlin, 1948) (unaccepted > superseded combination)
9. Species Opisthostoma (Plectostoma) christae Maassen, 2001 accepted as Plectostoma christae (Maassen, 2001) (basionym)
10. Species Opisthostoma (Plectostoma) concinnum Fulton, 1901 accepted as Plectostoma concinnum (Fulton, 1901)
11. Species Opisthostoma (Plectostoma) cookei E. A. Smith, 1894 accepted as Plectostoma cookei (E. A. Smith, 1894)
12. Species Opisthostoma (Plectostoma) crassipupa van Benthem Jutting, 1952 accepted as Opisthostoma crassipupa van Benthem Jutting, 1952 accepted as Plectostoma crassipupa (van Benthem Jutting, 1952) (basionym)
13. Species Opisthostoma (Plectostoma) crassum Vermeulen, 1994 accepted as Plectostoma crassum (Vermeulen, 1994) (original combination)
14. Species Opisthostoma (Plectostoma) cyrtopleuron Vermeulen, 1994 accepted as Plectostoma cyrtopleuron (Vermeulen, 1994) (original combination)
15. Species Opisthostoma (Plectostoma) dancei Vermeulen, 1994 accepted as Plectostoma dancei (Vermeulen, 1994) (original combination)
16. Species Opisthostoma (Plectostoma) decrespignyi (H. Adams, 1865) accepted as Plectostoma decrespignyi H. Adams, 1865 (subsequent combination)
17. Species Opisthostoma (Plectostoma) depauperatum E. A. Smith, 1894 accepted as Plectostoma depauperatum (E. A. Smith, 1894) (unaccepted > superseded combination, basionym)
18. Species Opisthostoma (Plectostoma) dipterum Vermeulen, 1994 accepted as Plectostoma dipterum (Vermeulen, 1994) (original combination)
19. Species Opisthostoma (Plectostoma) dormani Vermeulen, 1994 accepted as Plectostoma dormani (Vermeulen, 1994) (original combination)
20. Species Opisthostoma (Plectostoma) episomon Vermeulen, 1994 accepted as Plectostoma episomon (Vermeulen, 1994) (original combination)
21. Species Opisthostoma (Plectostoma) everetti E. A. Smith, 1893 accepted as Plectostoma everetti (E. A. Smith, 1893)
22. Species Opisthostoma (Plectostoma) fraternum E. A Smith, 1905 accepted as Plectostoma fraternum (E. A Smith, 1905)
23. Species Opisthostoma (Plectostoma) goniostoma Vermeulen, 1994 accepted as Plectostoma goniostoma (Vermeulen, 1994) (original combination)
24. Species Opisthostoma (Plectostoma) grandispinosum Godwin-Austen, 1889 accepted as Plectostoma grandispinosum (Godwin-Austen, 1889)
25. Species Opisthostoma (Plectostoma) heteropleuron Vermeulen, 1994 accepted as Plectostoma heteropleuron (Vermeulen, 1994) (original combination)
26. Species Opisthostoma (Plectostoma) hosei Godwin-Austen, 1890 accepted as Plectostoma hosei (Godwin-Austen, 1890)
27. Species Opisthostoma (Plectostoma) inornatum Vermeulen, 1994 accepted as Plectostoma inornatum (Vermeulen, 1994) (original combination)
28. Species Opisthostoma (Plectostoma) jucundum E. A. Smith, 1893 accepted as Plectostoma jucundum (E. A. Smith, 1893)
29. Species Opisthostoma (Plectostoma) kakiense Tomlin, 1948 accepted as Plectostoma kakiense (Tomlin, 1948) (unaccepted > superseded combination)
30. Species Opisthostoma (Plectostoma) laidlawi Sykes, 1902 accepted as Plectostoma laidlawi (Sykes, 1902) (unaccepted > superseded combination)
31. Species Opisthostoma (Plectostoma) lissopleuron Vermeulen, 1994 accepted as Plectostoma lissopleuron (Vermeulen, 1994) (original combination)
32. Species Opisthostoma (Plectostoma) lituus Vermeulen, 1994 accepted as Plectostoma lituus (Vermeulen, 1994) (original combination)
33. Species Opisthostoma (Plectostoma) obliquedentatum Vermeulen, 1994 accepted as Plectostoma obliquedentatum (Vermeulen, 1994) (original combination)
34. Species Opisthostoma (Plectostoma) otostoma O. Boettger, 1893 accepted as Plectostoma otostoma (O. Boettger, 1893)
35. Species Opisthostoma (Plectostoma) palinhelix van Benthem Jutting, 1952 accepted as Plectostoma palinhelix (van Benthem Jutting, 1952) (unaccepted > superseded combination, basionym)
36. Species Opisthostoma (Plectostoma) perglaber Vermeulen, 1994 accepted as Plectostoma perglabrum (Vermeulen, 1994) (original combination)
37. Species Opisthostoma (Plectostoma) perspectivum Vermeulen, 1994 accepted as Plectostoma perspectivum (Vermeulen, 1994) (original combination)
38. Species Opisthostoma (Plectostoma) picsingense E. A. Smith, 1905 accepted as Plectostoma picsingense (E. A. Smith, 1905)
39. Species Opisthostoma (Plectostoma) ptychodon Vermeulen, 1994 accepted as Plectostoma ptychodon (Vermeulen, 1994) (original combination)
40. Species Opisthostoma (Plectostoma) pulchellum Godwin-Austen, 1890 accepted as Plectostoma pulchellum (Godwin-Austen, 1890) (unaccepted > superseded combination)
41. Species Opisthostoma (Plectostoma) pumilio E. A. Smith, 1894 accepted as Plectostoma pumilio (E. A. Smith, 1894) (original combination)
42. Species Opisthostoma (Plectostoma) pyrgiscus Vermeulen, 1994 accepted as Plectostoma pyrgiscus (Vermeulen, 1994) (original combination)
43. Species Opisthostoma (Plectostoma) retrovertens Tomlin, 1938 accepted as Plectostoma retrovertens (Tomlin, 1938) (unaccepted > superseded combination)
44. Species Opisthostoma (Plectostoma) salpidomon van Benthem Jutting, 1952 accepted as Plectostoma salpidomon (van Benthem Jutting, 1952) (unaccepted combination)
45. Species Opisthostoma (Plectostoma) sciaphilum van Benthem Jutting, 1952 accepted as Plectostoma sciaphilum (van Benthem Jutting, 1952) (unaccepted combination)
46. Species Opisthostoma (Plectostoma) senex van Benthem Jutting, 1952 accepted as Plectostoma senex (van Benthem Jutting, 1952) (unaccepted combination)
47. Species Opisthostoma (Plectostoma) shelfordi E. A. Smith, 1905 accepted as Plectostoma shelfordi (E. A. Smith, 1905)
48. Species Opisthostoma (Plectostoma) simplex Fulton, 1901 accepted as Plectostoma simplex (Fulton, 1901)
49. Species Opisthostoma (Plectostoma) sinyumensis Maassen, 2001 accepted as Plectostoma sinyumense (Maassen, 2001) (unaccepted > superseded combination, basionym)
50. Species Opisthostoma (Plectostoma) siphonostomum van Benthem Jutting, 1952 accepted as Plectostoma siphonostomum (van Benthem Jutting, 1952) (basionym)
51. Species Opisthostoma (Plectostoma) smithi Fulton, 1901 accepted as Opisthostoma smithi Fulton, 1901 (unaccepted subgeneric classification)
52. Species Opisthostoma (Plectostoma) stellasubis Vermeulen, 1994 accepted as Plectostoma stellasubis (Vermeulen, 1994) (original combination)
53. Species Opisthostoma (Plectostoma) stenotoreton Vermeulen, 1994 accepted as Plectostoma stenotoreton (Vermeulen, 1994) (basionym)
54. Species Opisthostoma (Plectostoma) transequatorialis Vermeulen, 1994 accepted as Plectostoma transequatoriale (Vermeulen, 1994) (original combination)
55. Species Opisthostoma (Plectostoma) tuba Vermeulen, 1994 accepted as Plectostoma tuba (Vermeulen, 1994) (original combination)
56. Species Opisthostoma (Plectostoma) turriforme van Benthem Jutting, 1952 accepted as Opisthostoma turriforme van Benthem Jutting, 1952 accepted as Plectostoma turriforme (van Benthem Jutting, 1952) (basionym)
57. Species Opisthostoma (Plectostoma) umbilicatum van Benthem Jutting, 1952 accepted as Plectostoma umbilicatum (van Benthem Jutting, 1952) (basionym)
58. Species Opisthostoma (Plectostoma) wallacei (Ancey, 1887) accepted as Plectostoma wallacei Ancey, 1887
59. Species Opisthostoma (Plectostoma) wilfordi Vermeulen, 1994 accepted as Plectostoma wilfordi (Vermeulen, 1994) (original combination)

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