Ingo Arndt / Mayflies (Palingenia longicauda) swarming at sunset, Danube Delta, Romania
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Doug Wechsler / Giant mayfly (Hexagenia) Adirondack Park, New York, USA, July.
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Adrian Davies / Mayfly (Ephemera danica) on nettle, Surrey, England, UK, May.
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Jussi Murtosaari / Brown Mayfly (Ephemera vulgata) adult male, Joutsa (formerly Leivonmaki), Finland, July.
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Nick Upton / Green drake mayfly (Ephemera danica), newly emerged on a riverside grass stem, Wiltshire, UK, May.
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Andy Sands / Mayfly (Ephemera danica) just emerged at waters surface in dun form, the first of two winged adult instars or developmental stages, Hertfordshire, England, UK, June.
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Andy Sands / Mayfly (Ephemera danica) just emerged at waters surface in dun form, the first of two winged adult instars or developmental stages, Hertfordshire, England, UK, June.
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Jan Hamrsky / Common burrowing mayfy nymph (Ephemera danic(b, Europe, May, controlled conditions
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Emanuele Biggi / Beautiful demoiselle (Calopteryx virgo) feeding on Mayfly (Ephemera sp.) prey, on foliage overhanging a small stream, Genova, Italy. July.
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Guy Edwardes / Green drake mayfly (Ephemera danica) resting on dew-covered grass, Rhodope Mountains, Bulgaria. June.
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Hermann Brehm / Tisza mayflies (Palingenia Longicauda) mass emergence on river, River Tisza, Hungary. June.
