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What are Mayflies?

Michael Anissimov
Updated May 21, 2024
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Mayflies are a group of winged insects classified under Order Ephemeroptera, which means "short-lived wing" in Greek. Mayflies are famous for their short adult lifespans: ranging from a day to as short as 30 minutes. This makes them one of the animals that spends the shortest time as an adult, including all known microorganisms.

Mayflies superficially resemble a cross between dragonflies and crickets, to both of which they are related. Mayflies spend months to years in an undeveloped form called a nymph. Mayflies of a given population tend to all mature simultaneously, covering every available surface and being ubiquitous for their very short lifespans. They live just long enough to reproduce and die. By contrast, most other insects live for a few weeks at the least.

There are about 2,500 species of mayfly known worldwide, with 630 species found in North America. Like dragonflies and damselflies, mayflies are classified in an ancient group called the Paleoptera. This group is characterized by the presence of wings but no ability to fold them back, which most other insects possess. Most insects fall under Neoptera, meaning "new winged insects," which are known to be a monophyletic group (descending from a common ancestor). The Paleoptera might not be a monophyletic group, but simply what remains when the Neoptera are subtracted. Most members of Paleoptera are fossils, with relatively few extant species.

The mayflies are known as animals very sensitive to pollution, meaning that where they are found, the water is very clean. Mayfly naiads primarily live in streams under rocks, but a few live on lakes. These are among the most prolific, and occur in such concentrations that their simultaneous growth into adult form has been detected using doppler radar. Lake Erie is famous for its concentration of mayflies.

All The Science is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Michael Anissimov
By Michael Anissimov
Michael Anissimov is a dedicated All The Science contributor and brings his expertise in paleontology, physics, biology, astronomy, chemistry, and futurism to his articles. An avid blogger, Michael is deeply passionate about stem cell research, regenerative medicine, and life extension therapies. His professional experience includes work with the Methuselah Foundation, Singularity Institute for Artificial Intelligence, and Lifeboat Foundation, further showcasing his commitment to scientific advancement.
Discussion Comments
By sputnik — On Dec 20, 2008

Many poets use the short life of mayflies as a metaphor for the life of man, that seems to be oh so short.

Michael Anissimov
Michael Anissimov
Michael Anissimov is a dedicated All The Science contributor and brings his expertise in paleontology, physics, biology...
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