Britannica
Sources used in this answer
Where do female mayflies lay their eggs?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
mayfly
An adult mayfly (Ephemera vulgata) in Europe.
Female mayflies deposit their eggs in water, where the eggs either settle to the bottom or adhere to submerged objects.1
The specific methods of oviposition vary by species:
- Aerial release: Some species drop egg masses from a height of several feet in a maneuver resembling dive-bombing.1
- Surface contact: The female may fly low over the water, striking the surface with the tip of her abdomen to wash off eggs at intervals.1
- Direct deposition: Some females land on objects protruding from the water, crawl beneath the surface, and deposit their eggs while submerged.1
- Terminal release: In some cases, the female falls to the water's surface with her wings extended and squeezes out the eggs as she dies.1
Additionally, a few species are ovoviviparous, meaning the eggs hatch within the female's body as she dies on the surface of a pond or stream. Occasionally, mayflies mistake blacktopped roads for water and deposit their eggs on the road surface.1