| abstract | A new species of pygmephorid mites, Pediculaster absentia sp. n. (Acari: Prostigmata: Pygmephoridae) is described and illustrated based on phoretic female found in northern forests of Iran, phoretic on muscid flies, Helina spp. (Diptera: Muscidae). Also, Pediculaster muscarius (Martin, 1978), P. martyani Khaustov, 2008 and P. montanus Khaustov, 2008 are recorded on the flies from Iran for the first time. As well as, the variation of hysterosomal setae, along with distributions and host range of recorded species is reviewed. |