Green drake mayfly (Ephemera danica) newly emerged on a riverside umbel flowerhead in May, Wiltshire, England, United Kingdom, Europe

Green drake mayfly (Ephemera danica) newly emerged on a riverside grass stem, Wiltshire, England, United Kingdom, Europe

Mayfly (Ephemeroptera) on blade of grass

Green Drake Mayfly, Dayfly (Ephemera danica), Tauber Giessen, Germany, Europe

Mayfly or Dayfly (Ephemeroptera) on a leaf, Mindelheim, Bavaria, Germany, Europe

mayfly, ephemera, Ephemeropteridae, Germany

Mayfly (Ephemera glaucops) and its double on white background

Mayfly (Ephemera sp) nymph on a grass, Fouzon meadows, Loir et Cher, France

Dewy Mayfly warming, Prairie Fouzon France