The Ephemeroptera are a small Order of aquatic insects, often referred to as Mayflies. The name comes from a Greek word meaning 'living a day' due to the adults having very short lives, usually between one and four days only. There are fewer than 50 British species of Mayfly.

Notably they have a fully winged subimago (preadult).

A photograph of a mayfly resting on bracken.

Mayflies are very short lived as adults. Most only live between one and four days.

Other names for (or types of) Ephemeroptera include:

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