ACARINA

This paper provides an illustrated description of two water mite species of the genus Atractides—Atractides (Atractides) arzanensis sp. n. and Atractides (Atractides) teneroides sp. n.—from the running waters of Russia.

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.

The genus Raphignathus Dugès (Acari: Raphignathidae) of Asian Russia is reviewed. Raphignathus sakhalinensis sp. n. is described based on female and male specimens collected from spruce bark on Sakhalin Island; R. longipes sp. n. is described based on female and male specimens collected from various regions of Russia (Bashkortostan, Tyumenskaya Oblast, the Respublika Altay and Kamchatka). Raphignathus fani Doğan and Ayyildiz and R. ozkani Doğan are recorded from Russia for the first time and redescribed. Raphignathus gracilis (Rack) is recorded from Asian Russia for the first time. A key to the species of Raphignathus of Russia is also provided.

Phoretic deutonymphs of Winterschmidtia tawantinsuyuca sp. n. (Acari: Winterschmidtiidae) are described from Peru. This is the fourth species of the genus recorded in the Neotropical realm. Similar to the three other Peruvian species, the new species is phoretic on bark beetles, but this is the first finding of Winterschmidtia on the beetles of the genus Xyleborus (Coleoptera: Curculionidae: Scolytinae). The new species differs from all others in the ornamentation on of its prodorsal shield.

This study is based on oribatid mite materials collected from forest litter in Taiwan. In particular, in the course of our study, we recorded 10 species from 10 genera and eight families. Of these, two species (Scheloribates guhitanus, Setogalumna luzonica) have been recorded for the first time from Taiwan. Additionally, a supplementary description of Pergalumna kunsti is presented based on specimens from Taiwan. An identification key to the known species of Pergalumna from the Oriental region is presented.

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.

Supplementary description of Ctenobelba (Caucasiobelba) urhani Baran, 2015 is presented, based on adults collected from Georgia. The morphological similarity between Ct. (Ca.) urhani Baran, 2015 and Ct. (Ca.) reticulata Subías and Shtanchaeva, 2010 is discussed.