<i>Cinygmula uyka</i> sp.n., a new mayfly species (Insecta, Ephemeroptera, Heptageniidae) from the Okhotsk Region of the Russian Far East
A new mayfly species, Cinygmula uyka Gorovaya et Tiunova, sp.n. is described from the Far East of Russia from its male and female imagos, larvae and eggs. The shape of the male genitalia of the new species is similar to that of the C. malaisei (Ulmer, 1927) but differs by its massive penis lobes with lateral processes. The larvae of C. uyka and C. cava (Ulmer, 1927) are similar in the shape of first tergalia and the presence of a bush-like lobe appearing as 1–2 filament, but differ in wider tergaliae in comparison with C. cava.