| abstract | Water mite species of the genus Hydrodroma Koch, 1837 are common in running and standing waters in the Neotropical region. In this study four Hydrodroma species are reported from Argentina. Redefinitions are given for H. peregrina (Koenike, 1905), H. robusta K. Viets, 1954 stat. nov., and H. longiseta K. Viets, 1954, stat. nov. Two species, i.e., Hydrodroma argentinensis sp. nov. and H. ventana sp. nov. are described as new for science. |