Abstract
Two new species, Eustigmaeus reticulatus sp. n. and E. pseudolacunus sp. n. (Acari: Stigmaeidae) are described based on females and males collected from different parts of Russia. A fragment of the COI barcoding gene was sequenced to facilitate DNA-based identification. Based on the study of the holotype of Eustigmaeus mineus Barilo, it is considered a junior synonym of Eustigmaeus collarti Cooreman. An updated key to the Eustigmaeus species of Russia is provided.
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