معرفی یک گونه از جنس Lasioseius (Mesostigmata: Blattisociidae) برای فون کنه‌های ایران

The predatory mites of family Blattisociidae belong to the order Mesostigmarta and the superfamily Phytoseioidea. Members of this family are adapted to a broad spectrum of dry and wet habitats. Most species of this family have been reported from soil and litter, while some species have been found on rodent and in bird nests as well as from aerial plant parts. Members of the family Blattisociidae play an important role in control of plant pests populations. Some species of the genus Lasioseius Berlese, 1916 have been reported feeding on phytophagous mites, small insects, springtails and nematodes while some others have also been observed to feed on fungi. So far, 20 species of genus Lasioseius have been reported from Iran, among them six species include of: L. extremus )Daneshvar, 1987(, L. floridensis Berlese, 1916, L. scapulatus Kennet 1958, L. youcefi Athias-Hernriot, 1959, L. sugawarai Ehara, 1964 and L. frankbakkeri Faraji & Karg, 2005 were recorded from Guilan Province. During 2021, fauna of soil mesostigmatic mites in Saravan forest located in Rasht city were studied. Forest soil samples were collected and transferred to the acarology laboratory in University of Guilan.The mites were extracted by Berlese/Tullgren funnel. Mite specimens cleared in Nesbitt's fluids and mounted on microscopic slides using Hoyer's medium. Mite species were identified using valid identification keys. During this study species Lasioseius formosus Westerboer, 1963 was collected and identified. This species is reported from Iran for the first time. So far, this species has been reported from Europe in the animal manure. Some important characteristics of the species include of: ventrianal shield broadly oval, with 7 pairs of setae, peritreme without poststigmtic projection, fix digit of the chelicerae with 5 teeth, idiosoma with 500 and first leg with 390 mµ length.