Hydrozetidae Grandjean, 1954
Hydrozetes amudariensis Koshchanova & Krivolutsky, 1984
Hydrozetes californiensis Habeeb, 1974
Hydrozetes capensis Engelbrecht, 1974
Hydrozetes confervae (Schrank, 1781)
Hydrozetes dimorphus Hammer, 1962
Hydrozetes edentulus Willmann, 1931
Hydrozetes eichhornia (Soliman, Hussein & Ramadan, 1991)
Hydrozetes escobari Fernández & Travé, 1984
Hydrozetes gueyeae Mahunka, 1990
Hydrozetes incisus Grandjean, 1948
Hydrozetes indicator Habeeb, 1974
Hydrozetes laccosis Woolley, 1969
Hydrozetes lacustris (Michael, 1882)
Hydrozetes lemnae (Coggi, 1897)
Hydrozetes megacephalum (Berlese, 1901)
Hydrozetes niloticus (Soliman, Hussein & Ramadan, 1991)
Hydrozetes nymphoides (Habeeb, 1982)
Hydrozetes octosetosus Willmann, 1931
Hydrozetes parisiensis Grandjean, 1948
Hydrozetes paulista Pérez-Íñigo & Baggio, 1989
Hydrozetes petrunkevitchi Newel, 1945
Hydrozetes platensis Berlese, 1902
Hydrozetes replacementica (Soliman, Hussein & Ramadan, 1991)
Hydrozetes ringueleti Fernández, 1984
Hydrozetes tamarae Toslstikov, 1996
Hydrozetes terrestris Berlese, 1910
Hydrozetes thienemanni Strenzke, 1943
Hydrozetes tobaicus Willmann, 1931
Hydrozetes tridactylus Abdel-Hamid, 1964
Hydrozetes uberabensis Pérez-Íñigo & Baggio, 1996
Hydrozetes vicarius Balogh, 1958
Hydrozetes videor Habeeb, 1974
