A new oribatid mite of the genus Pergalumna (Acari: Oribatida: Galumnidae) from north-west of Iran

new species of galumnid mite (Acari: Oribatida: Galumnidae), Pergalumna (Pergalumna) granulistriata Akrami sp. nov., is described from soil in Zanjan Province, northwestern Iran. It is characterized by dentate rostrum; granulatestriate prodorsum; minute interlamellar setae; short bothridial setae, with finely barbed claviform head; complete dorsosejugal furrow; porose areas Aa divided into two parts, its anterior part very large, irregularly key-shaped, posterior part very small, rounded; presence of median pore; longitudinally striated genital plates and large, elongated postanal porose area. The new species is morphologically most similar to Pergalumna (P.) formicaria (Berlese, 1914), however, differs from it by the presence of teeth on rostrum; the surface ornamentation of prodorsum and pteromorphs; divided notogastral porose areas Aa. An identification key to known species of Iranian Pergalumna is given.