| abstract | This study presents a detailed taxonomic review of water mites of the Piona nodata and the P. coccinoides complexes (Pionidae, Piona), found in Russia. The review includes illustrations, descriptions and redescriptions of 11 Piona species found in Russia: Piona accepta sp. n.; P. ambigua (Piersig, 1894); P. annulata (Thor, 1901); P. caucasica Tuzovskij, 2019; P. coccinoides (Thor, 1897); P. inflata Sokolow, 1927; P. laminata (Thor, 1901); P. magadanensis Tuzovskij, 2013; P. neococcinoides Tuzovskij, 2019; P. nodata (Müller, 1776); and P. nodatella Tuzovskij, 2015. |