The Tisa's flower or Tisa mayfly (Palingenia longicauda) is an ancient insect species. Ascendants of this species emerged some 200 million years ago. The Tisa River is one of the last sanctuaries where the Tisa's flower has its massive appearance every year.
Unlike most mayflies, adult Tisa's flowers never leave the water; their cerci are constantly touching or sweeping the surface. The slow-moving river and absence of surface-feeding fish help make this possible. Now extinct in many European countries, Tisa's flower can be found in Serbia and Hungary on the Tisza river.
(thanks Bojan)
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