The Tydeidae fauna of the Altay (Altayskiy Kray and Respublika Altay) is reviewed. A total of nine species of the genus Brachytydeus were found. Among them, Brachytydeus montanus sp. n., B. altaicus sp. n. and B. brevisetosus sp. n. are new to science. Brachytydeus politus (Kuznetsov), B. reticuloinsignius (Kazmierski and Panou) and B. sleipneri (Momen and Lundquist) comb. n. are recorded from Russia for the first time. Brachytydeus arkadiensis (Panou and Emmanouel), B. magus (Kuznetsov) and B. woolleyi (Baker) are reported from Altay for the first time.
We present a revised generic diagnosis of Caucaseremaeus (Oribatida: Eremaeidae). The redescription of Caucaseremaeus krivolutskyi Shtanchaeva and Subías, 2006 is presented, based on the paratype (Armenia) and on the specimens collected from the Republic of Abkhazia. In addition, remarks on the family placement of Caucaseremaeus are provided.