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Phreatalona protzi (Hartwig, 1900) is a rare species of Cladocera (Crustacea) known from Western Europe. However, hardly any ecological information about this species is available and it has not been included in lists of species found in North-East European Russia. Here we present first findings of Ph. protzi in lake sediments of a small tundra lake from the Pechora River delta, Nenets State Nature Reser, Russian Arctic. The bottom sediment samples from 11 tundra lakes were used for analysis of subfossil Cladocera...