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Soil-dwelling mites and especially Gamasina (Mesostigmata) are very important to soil ecosystems. They are one of the major groups rich in species and abundance. In order to study mesostigmatic mite fauna, soil samples were collected from different oak forests of Lordegan region. The mites were extracted using Berlese-Tullgren funnels and then cleared in Lactic acid and mounted in Hoyer's medium. This study reports on the distribution of soil mesostigmatids in Iran and world-wide. Twenty species belonging to 13 genera of five families were collected and identified. Species are listed as follows: Ascidae: Arctoseius cetratus (Sellnick, 1940), Gamasellodes bicolor (Berlese, 1918), Antennoseius (Antennoseius) bacatus Athias-Henriot, 1961, Antennoseius (Antennoseius) masoviae (Sellnick, 1943). Blattisociidae: Lasioseius youcefi Athias-Henriot, 1959. Laelapidae: Cosmolaelaps rectangularis Sheals, 1962, Euandrolaelaps karawaiewi (Berlese, 1903), Gaeolaelaps aculeifer (Canestrini, 1883), Gaeolaelaps minor (Costa, 1968), Gaeolaelaps oreithyiae (Walter & Oliver, 1989), Haemolaelaps fenilis (Megnin, 1875), Haemolaelaps shealsi (Costa, 1968), Haemolaelaps schusteri (Hirschmann, 1966), Laelaspis kamalii Joharchi and Halliday, 2012, Laelaspis missouriensis (Ewing, 1904), Gymnolaelaps canestrinii (Berlese, 1903), Gymnolaelaps obscuroides (Costa, 1968). Ologamasidae: Sessiluncus hungaricus Karg, 1964, Allogamasellus sp.; Veigaiidae: Veigaia planicola Berlese, 1882. The genus Allogamasellus and Haemolaelaps schusteri are reported for the first time for Iranian mite fauna and the male of Laelaspis kamalii is reported for the first time for world fauna.

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Soil-dwelling Entomobryomorphan Collembola from the Northeast of Iran were sampled for the first time as part of a biodiversity surveying study with the aim of improving ecosystem conservation. Materials were obtained by sampling in three different ecosystems including forest, rangeland and agricultural fields between 2018 and 2019. The specimens were cleared using either Nesbitt’s fluid or lactic acid and permanent microscopic slides were prepared using Hoyer’s medium. As the result of this study, twenty-nine species belonging to twenty-two genera and five families of the order Entomobryomorpha were identified. Among them, two genera and eight species are recorded for the first time from Iran. The new records are Desoria trispinata (MacGillivray, 1896), Drepanosira hussi Neuherz, 1976, Heteromurtrella sp., Orchesella flavescens (Bourlet, 1839), Willowsia bartkei Stach, 1965, Agrenia sp., and Isotomiella gracilimucronata Rusek, 1981. Micrographs of their important features and a key to the species are also provided.