How many mayfly species occur in the United States and Canada?

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A mayfly (Ephemera vulgata) with delicate, veined wings and long tail filaments clings to a green blade of grass against a blurred green background. — mayfly An adult mayfly (*Ephemera vulgata*) in Europe.

There are approximately 700 species of mayflies that occur in the United States and Canada. Worldwide, more than 2,500 species of these insects have been described.1