Ephemera danica

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Ephemera danica, the green drake or green drake mayfly, is a species of mayfly in the genus Ephemera. Ephemera danica can reach an imago size of 15–20 mm (0.6–0.8 in) in males, while females are larger, reaching 16–25 mm (0.6–1.0 in). This mayfly, with its characteristic markings and three tails (cerci), is the most commonly seen of British Ephemeridae. Imago wings are translucent with dark veining, while in subimago they are dull and yellowish with brown veins. Moreover, forelegs and the tails of the spinners are much longer than in duns. Mouthparts are non-functional, as adults do not feed. These insects are aeroplankton and usually are food for swallows, trout and various species of amphibians and spiders. The life cycle usually lasts one or two years, but sometimes the developing nymphal forms may last for up to three years. Nymphs can reach a length of about 30 millimetres (1.2 in). They dig tunnels into the gravel in the beds of rivers and feed by filtering organic detritus, before emerging in spring and moving towards shallow waters.