Order Ephemeroptera is a group of insects commonly known as mayflies. While the scientific name is specific to this group, there are numerous synonyms that can be used to describe these insects. Some of these include the up-winged flies, dayflies, shadflies, and fishflies, all of which refer to the short lifespan of mayflies, which typically lasts for less than a day. Other synonyms include the stoneflies, which are similar to mayflies in appearance and habitat, and the dragonflies, which are larger and have longer lifespans. Regardless of the synonym used, Order Ephemeroptera plays an important role in the ecosystem and can be found in bodies of freshwater all over the world.