Ptyctimous mites (Acari, Oribatida) from the Joint Russian-Vietnamese Biological Expedition (October 2013-April 2014).

An annotated checklist of ptyctimous mite taxa, collected from the Joint Russian-Vietnamese Biological expedition (October 2013-April 2014) in four forest zones (Dong Nai Biosphere Reserve, Dong Nai Culture and Nature Reserve, Bu Gia Map National Park, Bi Dup-Nui Ba National Park) is provided. It includes 28 species, 16 genera and six families. One new subgenus, Euphthiracarus (Parapocsia) Niedbała subgen. nov., and five new species, Acrotritia paragranulata Niedbała sp. nov., Hoplophthiracarus clavatus Niedbała sp. nov., Steganacarus (Rhacaplacarus) spinus Niedbała sp. nov., Euphthiracarus (Euphthiracarus) quasitakahashii Niedbała sp. nov. and Euphthiracarus (Parapocsia) medius Niedbała sp. nov., are described. Supplementary descriptions of Apoplophora minuscula Niedbała, 2013 (see Niedbała & Ermilov 2013), Arphthicarus parasentus Niedbała, 2000 and Atropacarus (Hoplophorella) stilifer (Hammer, 1961) are presented.