Pycnogonum is een geslacht van zeespinnen uit de familie van de Pycnogonidae.

Soorten 
 Pycnogonum (Nulloviger) africanum 
 Pycnogonum aleuticum Turpaeva, 1994
 Pycnogonum angulirostrum Stock, 1959
 Pycnogonum (Nulloviger) anovigerum  Clark, 1956
 Pycnogonum arbustum Stock, 1966
 Pycnogonum asiaticum Muller, 1992
 Pycnogonum aurilineatum Flynn, 1919
 Pycnogonum benokianum Ohshima, 1935
 Pycnogonum buticulosum Hedgpeth, 1949
 Pycnogonum calculum Bamber, 1995
 Pycnogonum callosum Losina-Losinsky, 1961
 Pycnogonum (Nulloviger) carinatum Staples, 2002
 Pycnogonum cataphractum Mobius, 1902
 Pycnogonum cessaci Bouvier, 1911
 Pycnogonum (Retroviger) clarki Staples, 2002
 Pycnogonum coninsulum Bamber, 2008
 Pycnogonum cranaobyrsa Bamber, 2004
 Pycnogonum crassirostrum Sars, 1888
 Pycnogonum crosnieri Stock, 1991
 Pycnogonum daguilarensis Bamber, 1997
 Pycnogonum diceros Marcus, 1940
 Pycnogonum (Nulloviger) elephas Stock, 1966
 Pycnogonum eltanin Fry & Hedgpeth, 1969
 Pycnogonum forte Flynn, 1928
 Pycnogonum gaini Bouvier, 1910
 Pycnogonum gibberum Marcus & du Bois Reymond-M., 1963
 Pycnogonum gordonae Pushkin, 1984
 Pycnogonum grumus Arango, 2003
 Pycnogonum guyanae Stock, 1975
 Pycnogonum hancocki Schmitt, 1934
 Pycnogonum indicum Sundara Raj, 1930
 Pycnogonum kussakini Turpaeva, 2000
 Pycnogonum litorale (Strom, 1762) (Michelinmannetje)
 Pycnogonum (Nulloviger) lobipes Stock, 1991
 Pycnogonum madagascariensis Bouvier, 1911
 Pycnogonum magellanicum Hoek, 1898
 Pycnogonum magnirostrum Mobius, 1902
 Pycnogonum microps Loman
 Pycnogonum minutum Losina-Losinsky & Kopaneva, 1973
 Pycnogonum moniliferum Stock, 1991
 Pycnogonum moolenbeeki Stock, 1992
 Pycnogonum mucronatum Loman, 1908
 Pycnogonum (Retroviger) musaicum Stock, 1994
 Pycnogonum nodulosum Dohrn, 1881
 Pycnogonum occa Loman, 1908
 Pycnogonum orientale (Dana, 1849)
 Pycnogonum (Retroviger) ornans Stock, 1992
 Pycnogonum panamum Hilton, 1942
 Pycnogonum paragaini Munilla, 1990
 Pycnogonum (Nulloviger) planum Stock, 1954
 Pycnogonum platylophum Loman, 1923
 Pycnogonum plumipes Stock, 1960
 Pycnogonum portus Barnard, 1946
 Pycnogonum (Retroviger) pusillum Dohrn, 1881
 Pycnogonum pustulatum Stock, 1994
 Pycnogonum repentinum Turpaeva, 2003
 Pycnogonum repentium Turpaeva, 2003
 Pycnogonum reticulatum Hedgpeth, 1948
 Pycnogonum rickettsi Schmitt, 1934
 Pycnogonum saxulum Child, 1998
 Pycnogonum sivertseni Stock, 1955
 Pycnogonum spatium Takahashi, Dick & Mawatari, 2007
 Pycnogonum stearnsi Ives, 1883
 Pycnogonum stylidium Child, 1995
 Pycnogonum tenue Slater, 1879
 Pycnogonum tesselatum Stock, 1968
 Pycnogonum torresi Clark, 1963
 Pycnogonum tuberculatum Clark, 1963
 Pycnogonum tumulosum Loman, 1908
 Pycnogonum uedai Nakamura & Child, 1983
 Pycnogonum ungellatum Loman, 1911

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