1. Subgenus Pycnogonum (Nulloviger)
   1. Species Pycnogonum (Nulloviger) africanum Calman, 1938
   2. Species Pycnogonum (Nulloviger) anovigerum Clark, 1956
   3. Species Pycnogonum (Nulloviger) bifurcatum D. Lee, J.-H. Park & T. Park, 2023
   4. Species Pycnogonum (Nulloviger) carinatum Staples, 2002
   5. Species Pycnogonum (Nulloviger) elephas Stock, 1966
   6. Species Pycnogonum (Nulloviger) granulatum D. Lee & W. Kim, 2020
   7. Species Pycnogonum (Nulloviger) lobipes Stock, 1991
   8. Species Pycnogonum (Nulloviger) planum Stock, 1954
2. Subgenus Pycnogonum (Pycnogonum) Brünnich, 1764
   1. Species Pycnogonum (Pycnogonum) copleyi Staples, 2019
3. Subgenus Pycnogonum (Retroviger)
   1. Species Pycnogonum (Retroviger) clarki Staples, 2002
   2. Species Pycnogonum (Retroviger) musaicum Stock, 1994
   3. Species Pycnogonum (Retroviger) ornans Stock, 1992
   4. Species Pycnogonum (Retroviger) pusillum Dohrn, 1881
4. Species Pycnogonum aleuticum Turpaeva, 1994
5. Species Pycnogonum angulirostrum Stock, 1959
6. Species Pycnogonum arbustum Stock, 1966
7. Species Pycnogonum asiaticum Muller, 1992
8. Species Pycnogonum aurilineatum Flynn, 1919
9. Species Pycnogonum bamberi Munilla, Murillo & Soler-Membrives, 2015
10. Species Pycnogonum benokianum Ohshima, 1935
11. Species Pycnogonum buticulosum Hedgpeth, 1949
12. Species Pycnogonum calculum Bamber, 1995
13. Species Pycnogonum callosum Losina-Losinsky, 1961
14. Species Pycnogonum cataphractum Möbius, 1902
15. Species Pycnogonum cesairei Sabroux, 2022
16. Species Pycnogonum cessaci Bouvier, 1911
17. Species Pycnogonum cheni Staples, 2019
18. Species Pycnogonum coninsulum Bamber, 2008
19. Species Pycnogonum cranaobyrsa Bamber, 2004
20. Species Pycnogonum crassirostrum Sars, 1888
21. Species Pycnogonum crosnieri Stock, 1991
22. Species Pycnogonum daguilarensis Bamber, 1997
23. Species Pycnogonum diceros Marcus, 1940
24. Species Pycnogonum eltanin Fry & Hedgpeth, 1969
25. Species Pycnogonum forte Flynn, 1928
26. Species Pycnogonum gaini Bouvier, 1910
27. Species Pycnogonum gibberum Marcus & du Bois Reymond-M., 1963
28. Species Pycnogonum gordonae Pushkin, 1984
29. Species Pycnogonum grumus Arango, 2003
30. Species Pycnogonum guyanae Stock, 1975
31. Species Pycnogonum hancocki Schmitt, 1934
32. Species Pycnogonum indicum Sundara Raj, 1930
33. Species Pycnogonum kussakini Turpaeva, 2000
34. Species Pycnogonum litorale (Strøm, 1762)
35. Species Pycnogonum madagascariensis Bouvier, 1911
36. Species Pycnogonum magellanicum Hoek, 1898
37. Species Pycnogonum magnirostrum Möbius, 1902
38. Species Pycnogonum microps Loman, 1904
39. Species Pycnogonum minutum Losina-Losinsky & Kopaneva, 1973
40. Species Pycnogonum moniliferum Stock, 1991
41. Species Pycnogonum moolenbeeki Stock, 1992
42. Species Pycnogonum mucronatum Loman, 1908
43. Species Pycnogonum nodulosum Dohrn, 1881
44. Species Pycnogonum occa Loman, 1908
45. Species Pycnogonum orientale (Dana, 1849)
46. Species Pycnogonum panamum Hilton, 1942
47. Species Pycnogonum papua Bamber, 2013
48. Species Pycnogonum paragaini Munilla, 1990
49. Species Pycnogonum platylophum Loman, 1923
50. Species Pycnogonum plumipes Stock, 1960
51. Species Pycnogonum portus Barnard, 1946
52. Species Pycnogonum pustulatum Stock, 1994
53. Species Pycnogonum repentinum Turpaeva, 2003
54. Species Pycnogonum reticulatum Hedgpeth, 1948
55. Species Pycnogonum rickettsi Schmitt, 1934
56. Species Pycnogonum saxulum Child, 1998
57. Species Pycnogonum sentus Staples, 2019
58. Species Pycnogonum sivertseni Stock, 1955
59. Species Pycnogonum spatium Takahashi, Dick & Mawatari, 2007
60. Species Pycnogonum staplesi Bamber, 2013
61. Species Pycnogonum stearnsi Ives, 1883
62. Species Pycnogonum stylidium Child, 1995
63. Species Pycnogonum tenue Slater, 1879
64. Species Pycnogonum tesselatum Stock, 1968
65. Species Pycnogonum torresi Clark, 1963
66. Species Pycnogonum tuberculatum Clark, 1963
67. Species Pycnogonum tumulosum Loman, 1908
68. Species Pycnogonum uedai Nakamura & Child, 1983
69. Species Pycnogonum ungellatum Loman, 1911
70. Species Pycnogonum balaenarum Linnaeus, 1767 accepted as Pycnogonum litorale (Strøm, 1762)
71. Species Pycnogonum chelatum Böhm, 1879 accepted as Boehmia chelata (Bohm, 1879)
72. Species Pycnogonum claudum Loman, 1908 accepted as Pycnopallene clauda (Loman, 1908)
73. Species Pycnogonum crassirostre Sars, 1888 accepted as Pycnogonum crassirostrum Sars, 1888 (incorrect original spelling)
74. Species Pycnogonum grossipes Fabricius, 1780 accepted as Nymphon grossipes (Fabricius, 1780)
75. Species Pycnogonum koreanum Kim & Stock, J.H., 1984 accepted as Pycnogonum uedai Nakamura & Child, 1983 (synonym)
76. Species Pycnogonum leticiae Mello-Leitao, 1945 accepted as Pycnogonum cessaci Bouvier, 1911
77. Species Pycnogonum littorale (Strøm, 1762) accepted as Pycnogonum litorale (Strøm, 1762) (misspelling)
78. Species Pycnogonum occa Stock, 1997 non Loman, 1908 accepted as Pycnogonum staplesi Bamber, 2013
79. Species Pycnogonum pamphorum Marcus, 1940 accepted as Pycnogonum cessaci Bouvier, 1911
80. Species Pycnogonum repentium Turpaeva, 2003 accepted as Pycnogonum repentinum Turpaeva, 2003
81. Species Pycnogonum rhinoceros Dohrn, 1881 accepted as Pycnogonum nodulosum Dohrn, 1881
82. Species Pycnogonum rhinoceros Loman, 1923 accepted as Pycnogonum diceros Marcus, 1940
83. Species Pycnogonum africanum Calman, 1938 represented as Pycnogonum (Nulloviger) africanum Calman, 1938
84. Species Pycnogonum anovigerum Clark, 1956 represented as Pycnogonum (Nulloviger) anovigerum Clark, 1956
85. Species Pycnogonum bifurcatum D. Lee, J.-H. Park & T. Park, 2023 represented as Pycnogonum (Nulloviger) bifurcatum D. Lee, J.-H. Park & T. Park, 2023
86. Species Pycnogonum carinatum Staples, 2002 represented as Pycnogonum (Nulloviger) carinatum Staples, 2002
87. Species Pycnogonum clarki Staples, 2002 represented as Pycnogonum (Retroviger) clarki Staples, 2002
88. Species Pycnogonum copleyi Staples, 2019 represented as Pycnogonum (Pycnogonum) copleyi Staples, 2019
89. Species Pycnogonum elephas Stock, 1966 represented as Pycnogonum (Nulloviger) elephas Stock, 1966
90. Species Pycnogonum granulatum D. Lee & W. Kim, 2020 represented as Pycnogonum (Nulloviger) granulatum D. Lee & W. Kim, 2020
91. Species Pycnogonum lobipes Stock, 1991 represented as Pycnogonum (Nulloviger) lobipes Stock, 1991
92. Species Pycnogonum musaicum Stock, 1994 represented as Pycnogonum (Retroviger) musaicum Stock, 1994
93. Species Pycnogonum ornans Stock, 1992 represented as Pycnogonum (Retroviger) ornans Stock, 1992
94. Species Pycnogonum planum Stock, 1954 represented as Pycnogonum (Nulloviger) planum Stock, 1954
95. Species Pycnogonum pusillum Dohrn, 1881 represented as Pycnogonum (Retroviger) pusillum Dohrn, 1881

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