Description:

Nymphs: Nymphs have three distinct cerci (tails), occasionally two. The cerci may be fuzzy or threadlike, but never paddle or fan-like.

Color: Color varies from green, brown, gray, but usually black.

Reproduction: Eggs are deposited on the surface of the water, but they eventually drift to the bottom. Some species crawl under water and attach eggs to submerged objects.

Adults: Adult mayflies resemble nymphs, but usually possess two pairs of long, lacy wings folded upright. Adults usually have only two cerci.

Food: Mayfly food consists of small plant and animal debris, such as algae, diatoms, and plankton. Mayflies are preyed upon by fish and play an important role in the food chain.

Discussion:

Their presence is an indicator of clean water and a healthy environment. The chief importance lies in their value as food for fish, dragonfly nymphs and birds.

Huge swarms of adult mayflies have become a nuisance by their presence in some communities along the western basin of Lake Erie.

Mayflies accumulate around lights, roads, streets, sidewalks, etc. These annoying insects may fly into one's face, ears, hair, land on clothing, crawl behind eyeglasses and splatter car windshields. Mayflies do not bite or sting nor feed on homes, furnishings, food, etc.