Three new and one little-known species of Hypogastruridae (Collembola) from Russia’s northeast

Three new species, Hypogastrura variata sp. nov., Xenylla aculeata sp. nov., and X. arnei sp. nov., are described based on material from coastal communities of the Sea of Okhotsk, northeast Russia. Taxonomic remarks concerning a little-known species, H. yosii Stach, 1964, found in coastal wrack sediments on Kunashir Island, Kuriles are also given. COI sequences of the above species are analysed, thus allowing for their species statuses to be confirmed