1. Species Acanthocyclops agamus Kiefer, 1938
2. Species Acanthocyclops balcanicus Naidenov & Pandourski, 1992
3. Species Acanthocyclops brevispinosus (Herrick, 1884)
4. Species Acanthocyclops caesariatus Mercado-Salas & Suárez-Morales, 2009
5. Species Acanthocyclops capillatus (Sars G.O., 1863)
6. Species Acanthocyclops carolinianus (Yeatman, 1944)
7. Species Acanthocyclops cephallenus Pesce, 1978
8. Species Acanthocyclops chappuisi (Naidenov & Pandourski, 1992)
9. Species Acanthocyclops columbiensis Reid, 1990
10. Species Acanthocyclops crinitus (Graeter, 1908)
11. Species Acanthocyclops eduardoi Mercado-Salas & Álvarez-Silva, 2013
12. Species Acanthocyclops einslei Mirabdullayev & Defaye, 2004
13. Species Acanthocyclops exilis (Coker, 1934)
14. Species Acanthocyclops fiersi Mercado-Salas, Suárez-Morales, Khodami & Martínez Arbizu, 2023
15. Species Acanthocyclops fonticulus Lee & Chang, 2007
16. Species Acanthocyclops gmeineri Pospisil, 1989
17. Species Acanthocyclops gordani Petkovski, 1971
18. Species Acanthocyclops hispanicus Kiefer, 1937
19. Species Acanthocyclops insectus (Forbes S.A., 1882)
20. Species Acanthocyclops iskrecensis Pandourski, 1992
21. Species Acanthocyclops kagaensis Ito Tak, 1964
22. Species Acanthocyclops kieferi (Chappuis, 1925)
23. Species Acanthocyclops magistridussarti Stoch & Bruno, 2011
24. Species Acanthocyclops marceloi Mercado-Salas & Suárez-Morales, 2009
25. Species Acanthocyclops milotai Iepure & Defaye, 2008
26. Species Acanthocyclops miurai Ito Tak, 1957
27. Species Acanthocyclops montana Reid & Reed, 1991
28. Species Acanthocyclops morimotoi Ito Tak, 1952
29. Species Acanthocyclops muscicola (Lastochkin, 1924)
30. Species Acanthocyclops notabilis Mazepova, 1950
31. Species Acanthocyclops orientalis Borutzky, 1966
32. Species Acanthocyclops parasensitivus Reid, 1998
33. Species Acanthocyclops parcus (Herrick, 1882)
34. Species Acanthocyclops parvulus Strayer, 1988
35. Species Acanthocyclops pennaki Reid, 1992
36. Species Acanthocyclops petkovskii Pesce & Lattinger, 1983
37. Species Acanthocyclops phreaticus (Chappuis, 1928)
38. Species Acanthocyclops plesai Iepure, 2001
39. Species Acanthocyclops propinquus Plesa, 1957
40. Species Acanthocyclops radevi Pandourski, 1993
41. Species Acanthocyclops rebecae Fiers, Ghenne & Suárez-Morales, 2000
42. Species Acanthocyclops rhenanus Kiefer, 1936
43. Species Acanthocyclops sambugarae Kiefer, 1981
44. Species Acanthocyclops sensitivus (Graeter & Chappuis, 1914)
45. Species Acanthocyclops serrani Braicovich & Timi, 2009
46. Species Acanthocyclops signifer Mazepova, 1952
47. Species Acanthocyclops similis Flössner, 1984
48. Species Acanthocyclops smithae Reid & Suárez-Morales, 1999
49. Species Acanthocyclops strimonis (Pandourski, 1994)
50. Species Acanthocyclops tokchokensis Kim H.S. & Chang, 1991
51. Species Acanthocyclops transylvanicus Iepure & Oarga, 2011
52. Species Acanthocyclops troglophilus (Kiefer, 1932)
53. Subgenus Acanthocyclops (Megacyclops) Pesce & Maggi, 1977 accepted as Megacyclops Kiefer, 1927 (synonymy)
    1. Species Acanthocyclops (Megacyclops) dussarti Pesce & Maggi, 1977 accepted as Megacyclops dussarti Pesce & Maggi, 1977 represented as Megacyclops dussarti dussarti Pesce & Maggi, 1977
54. Species Acanthocyclops abyssicola (Lilljeborg, 1901) accepted as Diacyclops abyssicola (Lilljeborg, 1901)
55. Species Acanthocyclops alticola (Kiefer, 1935) accepted as Diacyclops alticola (Kiefer, 1935)
56. Species Acanthocyclops arenosus Mazepova, 1950 accepted as Diacyclops arenosus (Mazepova, 1950)
57. Species Acanthocyclops biarticulatus Monchenko, 1972 accepted as Monchenkocyclops biarticulataus (Monchenko, 1972)
58. Species Acanthocyclops bicuspidatus (Claus, 1857) accepted as Diacyclops bicuspidatus (Claus, 1857) represented as Diacyclops bicuspidatus bicuspidatus (Claus, 1857)
59. Species Acanthocyclops bisetosus (Rehberg, 1880) accepted as Diacyclops bisetosus (Rehberg, 1880)
60. Species Acanthocyclops brachypus (Kiefer, 1955) accepted as Megacyclops brachypus Kiefer, 1955
61. Species Acanthocyclops crassicaudis (Sars G.O., 1863) accepted as Diacyclops crassicaudis (Sars G.O., 1863) represented as Diacyclops crassicaudis crassicaudis (Sars G.O., 1863)
62. Species Acanthocyclops crassicaudoides (Kiefer, 1928) accepted as Diacyclops crassicaudoides (Kiefer, 1928)
63. Species Acanthocyclops deminutus (Sterba, 1954) accepted as Diacyclops languidus deminutus Sterba, 1954
64. Species Acanthocyclops denticornis Chislenko, 1977 (unaccepted > nomen nudum, Chislenko worked on marine harpacticoids, not cyclops, this is probably a mistake somewhere referring to Acanthodiaptomus denticornis.)
65. Species Acanthocyclops dussarti Pesce & Maggi, 1977 accepted as Acanthocyclops (Megacyclops) dussarti Pesce & Maggi, 1977 accepted as Megacyclops dussarti Pesce & Maggi, 1977 represented as Megacyclops dussarti dussarti Pesce & Maggi, 1977
66. Species Acanthocyclops ekmani Lindberg, 1950 accepted as Diacyclops ekmani (Lindberg, 1950)
67. Species Acanthocyclops elegans Mazepova, 1962 accepted as Diacyclops elegans (Mazepova, 1962)
68. Species Acanthocyclops fontinalis Naidenov, 1969 accepted as Diacyclops fontinalis Naidenov, 1969
69. Species Acanthocyclops formosanus Harada, 1931 accepted as Megacyclops formosanus (Harada, 1931)
70. Species Acanthocyclops galbinus Mazepova, 1962 accepted as Diacyclops galbinus (Mazepova, 1962)
71. Species Acanthocyclops gigas (Claus, 1857) accepted as Megacyclops gigas (Claus, 1857) represented as Megacyclops gigas gigas (Claus, 1857)
72. Species Acanthocyclops hypogeus (Kiefer, 1930) accepted as Diacyclops hypogeus Kiefer, 1930 represented as Cyclops (Diacyclops) hypogeus Kiefer, 1930
73. Species Acanthocyclops improcerus Mazepova, 1950 accepted as Diacyclops improcerus (Mazepova, 1950)
74. Species Acanthocyclops incolotaenia Mazepova, 1950 accepted as Diacyclops incolotaenia (Mazepova, 1950)
75. Species Acanthocyclops intermedius Mazepova, 1952 accepted as Diacyclops intermedius (Mazepova, 1952)
76. Species Acanthocyclops jasnitskii Mazepova, 1950 accepted as Diacyclops jasnitskii (Mazepova, 1950)
77. Species Acanthocyclops jeanneli (Chappuis, 1929) accepted as Diacyclops jeanneli (Chappuis, 1929)
78. Species Acanthocyclops konstantini Mazepova, 1962 accepted as Diacyclops konstantini (Mazepova, 1962)
79. Species Acanthocyclops languidoides (Lilljeborg, 1901) accepted as Diacyclops languidoides (Lilljeborg, 1901) represented as Diacyclops languidoides languidoides (Lilljeborg, 1901)
80. Species Acanthocyclops languidus (Sars G.O., 1863) accepted as Diacyclops languidus (Sars G.O., 1863) represented as Diacyclops languidus languidus (Sars G.O., 1863)
81. Species Acanthocyclops latipes (Lowndes, 1927) accepted as Megacyclops latipes (Lowndes, 1927)
82. Species Acanthocyclops lobulosus (Ekman, 1905) accepted as Diacyclops michaelseni (Mrázek, 1901)
83. Species Acanthocyclops longifurcus Shen & Sung, 1963 accepted as Diacyclops longifurcus (Shen & Sung, 1963)
84. Species Acanthocyclops macedonicus (Petkovski, 1954) accepted as Diacyclops stygius macedonicus Petkovski, 1954
85. Species Acanthocyclops magnus (Marsh, 1920) accepted as Megacyclops magnus (Marsh, 1920)
86. Species Acanthocyclops michaelseni (Mrázek, 1901) accepted as Diacyclops michaelseni (Mrázek, 1901)
87. Species Acanthocyclops mirnyi Borutzky & Vinogradov, 1957 accepted as Diacyclops mirnyi (Borutzky & Vinogradov, 1957)
88. Species Acanthocyclops nanus (Sars G.O., 1863) accepted as Diacyclops nanus nanus (Sars G.O., 1863)
89. Species Acanthocyclops niceae Mann, 1940 accepted as Megacyclops niceae (Mann, 1940) accepted as Megacyclops viridis (Jurine, 1820) represented as Megacyclops viridis viridis (Jurine, 1820)
90. Species Acanthocyclops pilosus Kiefer, 1934 accepted as Acanthocyclops venustoides (Coker, 1934) represented as Acanthocyclops venustoides venustoides (Coker, 1934)
91. Species Acanthocyclops plattensis Pennak & Ward, 1985 accepted as Acanthocyclops vernalis vernalis (Fischer, 1853)
92. Species Acanthocyclops profundus Mazepova, 1950 accepted as Acanthocyclops profundus profundus Mazepova, 1950
93. Species Acanthocyclops skottsbergi Lindberg, 1949 accepted as Diacyclops michaelseni (Mrázek, 1901)
94. Species Acanthocyclops spongicola Mazepova, 1962 accepted as Diacyclops spongicola (Mazepova, 1962)
95. Species Acanthocyclops stammeri Kiefer, 1930 accepted as Acanthocyclops venustus (Norman & Scott T., 1906) represented as Acanthocyclops venustus venustus (Norman & Scott T., 1906)
96. Species Acanthocyclops stygius (Chappuis, 1924) accepted as Diacyclops stygius stygius (Chappuis, 1924)
97. Species Acanthocyclops talievi Mazepova, 1970 accepted as Diacyclops talievi (Mazepova, 1970)
98. Species Acanthocyclops tenuispinalis Shen & Sung, 1963 accepted as Diacyclops tenuispinalis Shen & Sung, 1963
99. Species Acanthocyclops thomasi (Forbes S.A., 1882) accepted as Diacyclops thomasi (Forbes S.A., 1882)
100. Species Acanthocyclops trajani Mirabdullayev & Defaye, 2004 accepted as Acanthocyclops americanus (Marsh, 1893) represented as Acanthocyclops americanus americanus (Marsh, 1893)
101. Species Acanthocyclops versutus Mazepova, 1962 accepted as Diacyclops versutus (Mazepova, 1962)
102. Species Acanthocyclops americanus (Marsh, 1893) represented as Acanthocyclops americanus americanus (Marsh, 1893)
103. Species Acanthocyclops reductus (Chappuis, 1925) represented as Acanthocyclops reductus reductus (Chappuis, 1925)
104. Species Acanthocyclops robustus (Sars G.O., 1863) represented as Acanthocyclops robustus robustus (Sars G.O., 1863)
105. Species Acanthocyclops rupestris Mazepova, 1950 represented as Acanthocyclops rupestris rupestris Mazepova, 1950
106. Species Acanthocyclops venustoides (Coker, 1934) represented as Acanthocyclops venustoides venustoides (Coker, 1934)
107. Species Acanthocyclops venustus (Norman & Scott T., 1906) represented as Acanthocyclops venustus venustus (Norman & Scott T., 1906)
108. Species Acanthocyclops vernalis (Fischer, 1853) represented as Acanthocyclops vernalis vernalis (Fischer, 1853)
109. Species Acanthocyclops viridis (Jurine, 1820) represented as Acanthocyclops viridis viridis (Jurine, 1820) accepted as Megacyclops viridis viridis (Jurine, 1820)

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