Ephemera separigata, a New Species of Ephemeridae (Insecta: Ephemeroptera) from Korea

Mature larva and male and female adults of an ephemerid mayfly (Ephemeroptera : Ephemeridae) ,Ephemera separigata n.sp., were described from Korea. Larvae and adults of the species were distinguished from other Ephemera spp. by a apir of narrow and laterally oriented longitudinal stripses on the abodminal terga 7-9 . Larvae of the species adapted to cold water high mountain torrents(altitude 500-700m) where substrates were sand, gravel, and a large portion of pebbles and cobbles. Altitudinal adaptations between Korean Ephemera spp. were briefly discussed.