The Ephemera order of insects is the oldest on the planet. In their youth they are aquatic. The adults are fragile and delicate with gauzy wings that cannot be folded onto the abdomen – they are always held in the vertical position – and two or three “tails” (rings) at the tip of the abdomen. Their adult life is very short (hours or days) which gives rise to their name (from the Greek ephemeros = that which lives a day).