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How long do mayfly eggs usually take to hatch?
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mayfly
An adult mayfly (Ephemera vulgata) in Europe.
Mayfly eggs often hatch in about two weeks. However, the duration can vary depending on the species and environmental circumstances. In some cases, the eggs may undergo a period of diapause—a state of arrested growth—which allows the insects to avoid conditions that would be hostile to the developing nymphs. Additionally, a few species are ovoviviparous, meaning the eggs hatch within the body of the female.1