1. Species Harpacticus alevtinae Chislenko, 1977
2. Species Harpacticus aquilinus Fischer, 1860
3. Species Harpacticus arcticus (Poppe, 1884)
4. Species Harpacticus bairdii Thomson G.M., 1879
5. Species Harpacticus boehleri Pesta, 1916
6. Species Harpacticus brevicornis Giesbrecht, 1902
7. Species Harpacticus chauseica (Milne Edwards, 1840)
8. Species Harpacticus chelifer (Müller O.F., 1776)
9. Species Harpacticus clausi Scott A., 1909
10. Species Harpacticus compressus Frost, 1967
11. Species Harpacticus compsonyx Monard, 1926
12. Species Harpacticus concinnus Dana, 1848
13. Species Harpacticus confusus Vervoort, 1964
14. Species Harpacticus crassicornis Brady & Robertson, 1876
15. Species Harpacticus dezhnevi Chislenko, 1980
16. Species Harpacticus dubitabilis Herbst, 1960
17. Species Harpacticus falklandi Scott T., 1914
18. Species Harpacticus flexulosus Ceccherelli, 1988
19. Species Harpacticus flexus Brady & Robertson, 1873
20. Species Harpacticus fortificationis Fischer, 1860
21. Species Harpacticus furcifer Giesbrecht, 1902
22. Species Harpacticus giesbrechti Klie, 1927
23. Species Harpacticus glaber Brady, 1899
24. Species Harpacticus gracilis Claus, 1863
25. Species Harpacticus gurneyi Jakubisiak, 1933
26. Species Harpacticus islandicus Klie, 1939
27. Species Harpacticus koenigi Pesta, 1928
28. Species Harpacticus linearis Dana, 1848
29. Species Harpacticus littoralis Sars G.O., 1910
30. Species Harpacticus longiantennata Apostolov & Petkovski, 1980
31. Species Harpacticus macrodactylus Fischer, 1860
32. Species Harpacticus meridionalis Sars G.O., 1927
33. Species Harpacticus nipponicus Itô Tat., 1976
34. Species Harpacticus obscurus Scott T., 1895
35. Species Harpacticus pacificus Lang, 1965
36. Species Harpacticus pallaresae Wells, 2007
37. Species Harpacticus parachelifer Chislenko, 1976
38. Species Harpacticus piriei Scott T., 1912
39. Species Harpacticus ponticus Marcus, 1967
40. Species Harpacticus poppei Richard, 1897
41. Species Harpacticus pulex Humes, 1964
42. Species Harpacticus pulvinatus Brady, 1910
43. Species Harpacticus purpureus Itô Tat., 1979
44. Species Harpacticus robustus Brady, 1910
45. Species Harpacticus sacer Dana, 1848
46. Species Harpacticus simplex Brady, 1910
47. Species Harpacticus sparticus (Leigh-Sharpe, 1936)
48. Species Harpacticus spinulosus Lang, 1965
49. Species Harpacticus superflexus Willey, 1920
50. Species Harpacticus tae Karaytuğ, Sak, Sönmez & Külköylüoğlu, 2024
51. Species Harpacticus tenellus Sars G.O., 1920
52. Species Harpacticus trisetosus Lang, 1948
53. Species Harpacticus acutifrons Dana, 1848 accepted as Euterpina acutifrons (Dana, 1848) (basionym)
54. Species Harpacticus aegialobates Monard, 1926 accepted as Harpacticus nicaeensis Claus, 1866 represented as Harpacticus nicaeensis nicaeensis Claus, 1866 (listed as synonym in Wells, 2007)
55. Species Harpacticus cristatus Scott A., 1909 accepted as Perissocope cristatus (Scott A., 1909)
56. Species Harpacticus croni Krøyer in Gaimard, 1842 accepted as Thalestris croni (Krøyer in Gaimard, 1842) accepted as Halithalestris croni (Krøyer in Gaimard, 1842) accepted as Parathalestris croni (Krøyer in Gaimard, 1842) (transferred to Parathalestris)
57. Species Harpacticus curticornis Boeck, 1865 accepted as Tigriopus fulvus (Fischer, 1860) represented as Tigriopus fulvus fulvus (Fischer, 1860)
58. Species Harpacticus depressus Pallares, 1973 accepted as Harpacticus pallaresae Wells, 2007 (H. depressus Pallares was a primary homonym of H. depressus Boeck, 1865)
59. Species Harpacticus fulvus Fischer, 1860 accepted as Tigriopus fulvus (Fischer, 1860) represented as Tigriopus fulvus fulvus (Fischer, 1860)
60. Species Harpacticus gibbus Krøyer, 1842 accepted as Thalestris gibba (Krøyer, 1842)
61. Species Harpacticus helgolandicus Poppe, 1884 accepted as Harpacticus chelifer (Müller O.F., 1776) (synonym according to Lang (1948))
62. Species Harpacticus nobilis (Baird, 1846) accepted as Diarthrodes nobilis (Baird, 1846)
63. Species Harpacticus roseus Dana, 1848 accepted as Microsetella rosea (Dana, 1847)
64. Species Harpacticus spinosus Fischer, 1860 accepted as Parastenhelia spinosa (Fischer, 1860) represented as Parastenhelia spinosa spinosa (Fischer, 1860)
65. Species Harpacticus staphilinus Claus, 1858 accepted as Canthocamptus (Canthocamptus) staphylinus (Jurine, 1820) represented as Canthocamptus (Canthocamptus) staphylinus staphylinus Jurine, 1820
66. Species Harpacticus xenus Monard, 1926 accepted as Perissocope xenus (Monard, 1926)
67. Species Harpacticus furcatus Lang, 1936 represented as Harpacticus furcatus furcatus Lang, 1936
68. Species Harpacticus nicaeensis Claus, 1866 represented as Harpacticus nicaeensis nicaeensis Claus, 1866
69. Species Harpacticus septentrionalis Klie, 1939 represented as Harpacticus septentrionalis septentrionalis Klie, 1941
70. Species Harpacticus uniremis Krøyer in Gaimard, 1842 represented as Harpacticus uniremis uniremis Krøyer in Gaimard, 1842-1845?
71. Species Harpacticus dentatus Krichagin, 1873 (uncertain > taxon inquirendum)
72. Species Harpacticus elongatus Boeck, 1865 (uncertain > taxon inquirendum)
73. Species Harpacticus fucicolus Scott T., 1912 (uncertain > taxon inquirendum)
74. Species Harpacticus virescens Dana, 1848 (uncertain > taxon inquirendum, Species incertae sedis affter Lang (1948: 334) and Wells (2007: 19))

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