A new species and a new record of Leioseius Berlese (Acari: Mesostigmata: Ascidae) from Russia, with a review of the Russian species of the genus

A new predatory mite species of the genus Leioseius Berlese, L. subarcticus Joharchi n. sp., is described and illustrated on the basis of morphological characters of adults collected in the subarctic zone of northern Tyumen, from the soil covered with lichens. We also provide additional morphological information and new illustrations for L. changbaiensis Yin & Bei. The species known only from the type series, was found under bark in China (Changbai Mountains, Jilin Province) and is now recorded for the first time in the Altai Republic, Russia, close to type locality from the same habitat. In addition, an identification key to all known Russian species of the genus is presented.