What Does a Mayfly Insect Look Like? If you’ve ever seen a reedy-looking bug with two long, antenna-looking protrusions from its abdomen, you might have seen a mayfly. Mayflies have thin bodies ...

Scientists scooped sand from a riverbed in Thailand and found two nymphs of rare mayfly species not seen in 22 years, a study said. Photo from Kwanboon and Boonsoong (2025) Knee-deep in a river of ...