• Hemicyclops Boeck, 1873
• Hemicyclops Claus, 1893 accepted as Halicyclops Norman, 1903
• Hemicyclops aberdonensis (Scott T. & Scott A., 1892)
• Hemicyclops acanthophorus Humes, 1995
• Hemicyclops acanthosquillae Humes, 1965
• Hemicyclops adhaerens (Williams, 1907) accepted as Goodingius adhaerens (Williams, 1907)
• Hemicyclops adherens (Williams, 1907) accepted as Hemicyclops adhaerens (Williams, 1907) accepted as Goodingius adhaerens (Williams, 1907)
• Hemicyclops americanus Wilson C.B., 1932 accepted as Hemicyclops adhaerens (Williams, 1907) accepted as Goodingius adhaerens (Williams, 1907)
• Hemicyclops amplicaudatus Humes, 1965
• Hemicyclops apiculus Humes, 1995
• Hemicyclops arenicolae Gooding, 1960 accepted as Goodingius arenicolae (Gooding, 1960)
• Hemicyclops australis Nicholls, 1944
• Hemicyclops axiophilus Humes, 1965
• Hemicyclops bacescui (Serban, 1956) accepted as Hemicyclops cylindraceus (Pelseneer, 1929)
• Hemicyclops biflagellatus Humes, 1965
• Hemicyclops caissarum Kihara & Rocha, 1993 accepted as Giardella caissarum (Kihara & Rocha, 1993)
• Hemicyclops callianassae Wilson C.B., 1935 accepted as Hemicyclops thysanotus Wilson C.B., 1935
• Hemicyclops canuensis (Bourne, 1890)
• Hemicyclops carinifer Humes, 1965 accepted as Giardella carinifer (Humes, 1965)
• Hemicyclops columnaris Humes, 1984
• Hemicyclops cornutus Kim I.H. & Hong, 2014
• Hemicyclops ctenidis Ho & Kim I.H., 1990
• Hemicyclops cylindracea (Pelseneer, 1929) represented as Hemicyclops cylindraceus (Pelseneer, 1929)
• Hemicyclops cylindraceus (Pelseneer, 1929)
• Hemicyclops dilatatus Shen & Bai, 1956
• Hemicyclops diremptus Humes, 1965
• Hemicyclops dubia (Thompson I.C. & Scott A., 1903)
• Hemicyclops elongatus Wilson C.B., 1937 accepted as Goodingius elongatus (Wilson C.B., 1937)
• Hemicyclops geminatus Stock, 1992 accepted as Hemicyclops columnaris Humes, 1984
• Hemicyclops giardelloides Gooding, 1963 (unaccepted > interim unpublished)
• Hemicyclops gomsoensis Ho & Kim I.H., 1991
• Hemicyclops humesi Kim I.H., 2009
• Hemicyclops indicus Sewell, 1949
• Hemicyclops intermedius Ummerkutty, 1962
• Hemicyclops japonicus Itoh & Nishida, 1993
• Hemicyclops javaensis Mulyadi, 2005
• Hemicyclops kombensis Humes, 1965
• Hemicyclops latericius (Grube, 1869-1872) accepted as Hersiliodes latericius (Grube, 1869-1872)
• Hemicyclops leggii (Thompson I.C. & Scott A., 1903)
• Hemicyclops livingstoni (Scott T., 1894)
• Hemicyclops magnus Kim I.H., 2009
• Hemicyclops membranatus Moon & Kim I.H., 2010
• Hemicyclops minutus Mulyadi, 2005
• Hemicyclops mortoni Boxshall & Humes, 1987
• Hemicyclops nasutus Moon & Kim I.H., 2010
• Hemicyclops nichollsi Karanovic, 2008
• Hemicyclops parapiculus Kim I.H. & Hong, 2014
• Hemicyclops parilis Moon & Kim I.H., 2010
• Hemicyclops perinsignis Humes, 1973
• Hemicyclops puffini (Thompson I.C., 1888)
• Hemicyclops pugettensis Light & Hartman, 1937 accepted as Hemicyclops thysanotus Wilson C.B., 1935
• Hemicyclops purpureus Boeck, 1873
• Hemicyclops rapax Lee, Chang & Kim, I.H., 2022
• Hemicyclops saxatilis Ho & Kim I.H., 1991
• Hemicyclops sebastiani Kihara & Rocha, 1993
• Hemicyclops spinulosus Itoh & Nishida, 1998
• Hemicyclops subadhaerens Gooding, 1960 accepted as Goodingius subadhaerens (Gooding, 1960)
• Hemicyclops tamilensis (Thompson I.C. & Scott A., 1903)
• Hemicyclops tanakai Itoh & Nishida, 2002
• Hemicyclops thalassius Vervoort & Ramírez, 1966
• Hemicyclops thompsoni (Canu, 1888)
• Hemicyclops thysanotus Wilson C.B., 1935
• Hemicyclops tripartitus Kim I.H., 2009
• Hemicyclops ventriplanus Kim I.H., 2000
• Hemicyclops vicinalis Humes, 1995
• Hemicyclops visendus Humes, Cressey & Gooding, 1958
• Hemicyclops xiamenensis Ohtsuka, Ko & Xu, 2010