1. Species Gastrosaccus australis W. Tattersall, 1923
2. Species Gastrosaccus bispinosus Wooldridge, 1978
3. Species Gastrosaccus brevifissura O. Tattersall, 1952
4. Species Gastrosaccus daviei Bacescu & Udrescu, 1982
5. Species Gastrosaccus dunckeri Zimmer, 1915
6. Species Gastrosaccus gordonae O. Tattersall, 1952
7. Species Gastrosaccus kempi W. Tattersall, 1922
8. Species Gastrosaccus lombokiensis Hanamura, Mantiri & Ohtsuka, 2014
9. Species Gastrosaccus longifissura Wooldridge, 1978
10. Species Gastrosaccus madagascariensis Wooldridge, Mees & Webb, 1997
11. Species Gastrosaccus mediterraneus Bacescu, 1970
12. Species Gastrosaccus mozambicus Wooldridge & Mees, 2003
13. Species Gastrosaccus msangii Bacescu, 1975
14. Species Gastrosaccus namibensis Wooldridge & McLachlan, 1987
15. Species Gastrosaccus olivae Bacescu, 1970
16. Species Gastrosaccus psammodytes O. Tattersall, 1958
17. Species Gastrosaccus roscoffensis Bacescu, 1970
18. Species Gastrosaccus sanctus (Van Beneden, 1861)
19. Species Gastrosaccus sarae Panampunnayil, 1999
20. Species Gastrosaccus sorrentoensis Wooldridge & McLachlan, 1986
21. Species Gastrosaccus spinifer (Goës, 1864)
22. Species Gastrosaccus trilobatus Murano & McLachlan, 1998
23. Species Gastrosaccus widhalmi (Czerniavsky, 1882)
24. Species Gastrosaccus wittmanni Deprez, Wooldridge & Mees, 2000
25. Species Gastrosaccus yuyu Bamber & Morton, 2012
26. Species Gastrosaccus bengalensis Hansen, 1910 accepted as Haplostylus bengalensis (Hansen, 1910)
27. Species Gastrosaccus bengalis Hansen, 1910 accepted as Gastrosaccus bengalensis Hansen, 1910 accepted as Haplostylus bengalensis (Hansen, 1910) (unaccepted > misspelling - incorrect subsequent spelling)
28. Species Gastrosaccus bispinosa Wooldridge, 1978 accepted as Gastrosaccus bispinosus Wooldridge, 1978 (unaccepted > incorrect grammatical agreement of specific epithet, basionym; original spelling)
29. Species Gastrosaccus brasiliensis da Silva, 1970 accepted as Bowmaniella atlantica da Silva, 1971 accepted as Coifmanniella mexicana (W. Tattersall, 1951) (junior homonym in combination Bowmaniella brasiliensis (non B. brasiliensis (Bacescu, 1968) 1968))
30. Species Gastrosaccus brisbanensis Bacescu & Udrescu, 1982 accepted as Haplostylus brisbanensis (Bacescu & Udrescu, 1982) (basionym)
31. Species Gastrosaccus dakini W. Tattersall, 1940 accepted as Haplostylus dakini (W. Tattersall, 1940) (senior synonym)
32. Species Gastrosaccus dissimilis Coifmann, 1937 accepted as Chlamydopleon dissimile (Coifmann, 1937) (unaccepted > superseded combination, basionym)
33. Species Gastrosaccus elegans O. Tattersall, 1960 accepted as Iiella elegans (O. Tattersall, 1960) (senior synonym)
34. Species Gastrosaccus erythraeus (Kossmann, 1877) accepted as Haplostylus erythraeus Kossmann, 1880
35. Species Gastrosaccus formosensis Ii, 1964 accepted as Iiella formosensis (Ii, 1964) (senior synonym)
36. Species Gastrosaccus hibii Ii, 1964 accepted as Iiella hibii (Ii, 1964) (senior synonym)
37. Species Gastrosaccus indicus Hansen, 1910 accepted as Haplostylus indicus (Hansen, 1910)
38. Species Gastrosaccus johnsoni W. Tattersall, 1937 accepted as Bowmaniella johnsoni (W. Tattersall, 1937) accepted as Coifmanniella johnsoni (Tattersall, 1937) (basionym)
39. Species Gastrosaccus kojimaensis Nakazawa, 1910 accepted as Iiella kojimaensis (Nakazawa, 1910) (basionym)
40. Species Gastrosaccus lobatus Nouvel, 1951 accepted as Haplostylus lobatus (Nouvel, 1951) (senior synonym)
41. Species Gastrosaccus magnilobatus Bacescu & Schiecke, 1974 accepted as Haplostylus magnilobatus (Bacescu & Schiecke, 1974) (basionym)
42. Species Gastrosaccus mexicanus W. Tattersall, 1951 accepted as Bowmaniella mexicana (W. Tattersall, 1951) accepted as Coifmanniella mexicana (W. Tattersall, 1951) (basionym)
43. Species Gastrosaccus muticus W. Tattersall, 1915 accepted as Eurobowmaniella muticus (W. Tattersall, 1915) (senior synonym)
44. Species Gastrosaccus normani G.O. Sars, 1877 accepted as Haplostylus normani (G.O. Sars, 1877) (basionym)
45. Species Gastrosaccus ohshimai Ii, 1964 accepted as Iiella ohshimai (Ii, 1964)
46. Species Gastrosaccus pacificus Hansen, 1912 accepted as Haplostylus pacificus (Hansen, 1912) (basionym)
47. Species Gastrosaccus parerythraeus Nouvel, 1944 accepted as Haplostylus parerythraeus (Nouvel, 1944) (basionym)
48. Species Gastrosaccus parvus hansen, 1910 accepted as Haplostylus parvus (Hansen, 1910) (basionym)
49. Species Gastrosaccus pelagica Ii, 1964 accepted as Iiella pelagica (Ii, 1964) (senior synonym)
50. Species Gastrosaccus philippinensis W. Tattersall, 1951 accepted as Haplostylus bengalensis (Hansen, 1910)
51. Species Gastrosaccus pusillus Coifmann, 1937 accepted as Haplostylus pusillus (Coifmann, 1937) (senior synonym)
52. Species Gastrosaccus queenslandensis Bacescu & Udrescu, 1982 accepted as Haplostylus queenslandensis (Bacescu & Udrescu, 1982) (basionym)
53. Species Gastrosaccus robusta Panampunnayil, 1989 accepted as Haplostylus robusta (Panampunnayil, 1989) (basionym)
54. Species Gastrosaccus simulans W. Tattersall, 1915 accepted as Eurobowmaniella simulans (W. Tattersall, 1915) (genus transfer by Murano, 1996)
55. Species Gastrosaccus spiniferus (Goës, 1864) accepted as Gastrosaccus spinifer (Goës, 1864) (Synonym)
56. Species Gastrosaccus vulgaris Nakazawa, 1910 accepted as Archaeomysis vulgaris (Nakazawa, 1910)

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