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The copepod Apocyclops dengizicus (Lepeschkin, 1900), a denizen of the saline waterbodies of the desert and semidesert regions of the world, was found in one of the tributaries of the hyperhaline Lake Elton (Volgograd oblast). This finding marks the northernmost locality where this species has been recorded in Russia. An analysis of the latest published data shows that the northern limit of the range of this species crosses the Russian Transvolga Region and middle Kazakhstan approximately along the 50th latitude. The northern-most locality where this copepod has been recorded to date is still its type locality, Lake Siletiteniz (53 degrees N) in northern Kazakhstan. The possibility of finding A. dengizicus in adjacent oblasts of Russia as far north as the 55th latitude, where there are many highly mineralized waterbodies fit for this species, cannot be excluded.