| abstract | Eleven species of pygmephoroid mites (Acari: Pygmephoroidea: Neopygmephoridae, Scutacaridae, Microdispidae) are recorded from the ant Lasius fuliginosus (Latreille, 1798) from Western Siberia, Russia. Two of them, Petalomium fuliginosum sp. nov. (Acari: Neopygmephoridae) and Imparipes fuliginosophilus sp. nov. (Acari: Scutacaridae) are described as new for science. Unguidispus contematosus Sevastianov, 1981 (Acari: Microdispidae) is recorded for the first time from Russia and redescribed. Imparipes sevastianovi Khaustov, 2008, Imparipes brevibasis (Sevastianov, 1983) and Scutacarus flexisetus Karafiat, 1959 are also recorded for the first time from Russia. |