| Hydrozetidae Grandjean, 1954 (Family) |
| | | | | | | | | | details |
| Hydrozetes Berlese, 1902 (Genus) |
C | | | | | | | | | | details |
| Hydrozetes californicus (Species) |
| | | | | | | | | | details |
| Hydrozetes confervae (Schrank, 1781) (Species) |
| | | | | | | | | | details |
| Hydrozetes dimorphus Hammer, 1962 (Species) |
| | | | | | | | | | details |
| Hydrozetes escobari Fernandez, 1984 (Species) |
| | | | | | | | | | details |
| Hydrozetes incisus (Species) |
| | | | | | | | | | details |
| Hydrozetes indicator (Species) |
| | | | | | | | | | details |
| Hydrozetes laccosus (Species) |
| | | | | | | | | | details |
| Hydrozetes lacustris (Michael, 1882) (Species) |
| | | | | | | | | | details |
| Hydrozetes lemnae (Coggi, 1899) (Species) |
| | | | | | | | | | details |
| Hydrozetes megacephalum (Berlese, 1901) (Species) |
| | | | | | | | | | details |
| Hydrozetes mollicoma Hammer, 1958 (Species) |
| | | | | | | | | | details |
| Hydrozetes octosetosus (Species) |
| | | | | | | | | | details |
| Hydrozetes oryktosus (Species) |
| | | | | | | | | | details |
| Hydrozetes palustris (Michael, 1882) (Species) |
| | | | | | | | | | details |
| Hydrozetes parisiensis Grandjean, 1948 (Species) |
| | | | | | | | | | details |
| Hydrozetes paulista Perez-Inigo & Baggio, 1989 (Species) |
| | | | | | | | | | details |
| Hydrozetes petrunkevitchi (Species) |
| | | | | | | | | | details |
| Hydrozetes platensis Berlese, 1902 (Species) |
| | | | | | | | | | details |
| Hydrozetes ringueleti Fernandez (Species) |
| | | | | | | | | | details |
| Hydrozetes smithi (Species) |
| | | | | | | | | | details |
| Hydrozetes terrestris Berlese, 1910 (Species) |
| | | | | | | | | | details |
| Hydrozetes thienemanni Strenzke, 1943 (Species) |
| | | | | | | | | | details |
| Hydrozetes tobaicus Willmann (Species) |
| | | | | | | | | | details |
| Hydrozetes tridactylus (Species) |
| | | | | | | | | | details |
| Hydrozetes uberabensis Perez-Inigo & Baggio, 1996 (Species) |
| | | | | | | | | | details |
| Hydrozetes vicarius Balogh, 1958 (Species) |
| | | | | | | | | | details |