Two new species of the microdispid mites (Acari: Microdispidae) phoretic on Lucanus ibericus are described from Iran: Premicrodispus gorganiensis Rahiminejad and Seyedein sp. nov. and Neomicrodispus lucani Rahiminejad and Seyedein sp. nov. The mites were collected from forests with Hornbeam trees (Carpinus spp.) and Oak trees (Quercus spp.) in Gorgan, northern Iran. The distribution of the heterostigmatic mites on lucanid beetles is reviewed. Also, a key to species of the Neomicrodispus is provided.

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During a survey on heterostigmatic mites (Acari: Prostigmata) associated with insects, a new species, Imparipes (Imparipes) hajiqanbari sp. nov. (Heterostigmata: Scutacaridae) is described and illustrated based on female individuals associated with ants of Lasius sp. (Hymenoptera: Formicidae) collected from Hyrcanian forests, Gorgan, Northern Iran. Moreover, I. (I.) obsoletus Rack, 1966 and I. (I.) histricinus Berlese, 1903 are recorded from Iran for the first time. We further provide an overview of Iranian Imparipes mites associated with hymenopterans as well as their host range.

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A BS TRA CT . Following a short-term faunistic study on soil inhabiting heterostigmatic mites (Acari: Prostigmata: Heterostigmata), during springwinter 2019, in Gorgan, Golestan Province, northern Iran, a total of six species from five genera of two families were identified. Among them Promicrodispus pumilis (Sevastianov, 1975) and Premicrodispus montanus Khaustov, 2006 are new records for mite fauna of Iran. The genus Promicrodispus Khaustov, 2017 is recorded for the first time for the mite fauna of Iran. Moreover, Pre. akermanae (Sevastianov & Al Douri, 1988), Paramicrodispus scarabidophilus Hajiqanbar & Rahiminejad, 2012, Pygmodispus (Allodispus) latisternus Paoli, 1911 and Scutacarus sphaeroideus Karafiati, 1959 were collected from soil in the sampling sites. The world distribution of the mites is reviewed.