Mayflies are aquatic insects belonging to the order Ephemeroptera. This order is part of an ancient group of insects termed the Palaeoptera, which also contains dragonflies and damselflies. Over 3,000 species of mayfly are known worldwide, grouped into over 400 genera in 42 families.
Baetidae is a family of mayflies with about 1000 described species in 110 genera distributed worldwide. These are among the smallest of mayflies, adults rarely exceeding 10 mm in length excluding the two long slender tails and sometimes much smaller, and members of the family are often referred to as small mayflies or small minnow mayflies. Most species have long oval forewings with very few cross veins but the hindwings are usually very small or even absent. The males often have very large eyes, shaped like turrets above the head.
Baetis is a genus of mayflies of the family Baetidae, known as the blue-winged olive to anglers. There are at least 150 described species in Baetis. They are distributed worldwide, with the most variety in North America and northern Europe.
Fourmile Creek is a tributary of Lake Erie in Erie County, Pennsylvania, United States. It is approximately 8 miles (13 km) in length. It has a drainage basin of 11.93 square miles (30.9 km2) and is a part of the Lake Erie Watershed.
Rhithrogena is a genus of flatheaded mayflies in the family Heptageniidae. There are at least 150 described species in Rhithrogena.
Diphetor is a genus of mayflies in the family Baetidae,
Neoephemera is a genus of large squaregill mayflies in the family Neoephemeridae first described by McDunnough (1925). and containing approximately six described species in Neoephemera.
Pisciforma is a suborder of mayflies in the order Ephemeroptera. There are at least 410 described species in Pisciforma.
Baetis intercalaris is a species of small minnow mayfly in the family Baetidae. It is found in the south half of Canada and the continental United States.
Baetis tricaudatus is a species of small minnow mayfly in the family Baetidae. It is found in Central America and North America. In North America its range includes all of Canada, all of Mexico, and the continental United States.
Baetis alius is a species of small minnow mayfly in the family Baetidae. It is found in the northwestern United States.
Baetis sahoensis is a species of mayflies in the genus Baetis. It lives exclusively in Japan, with reported sightings near the cities of Osaka and Sapporo.
Baetis bicaudatus is a species of small minnow mayfly in the family Baetidae. It is found in southwestern, northern Canada, the western United States, and Alaska.
Baetis notos is a species of small minnow mayfly in the family Baetidae. It is found in Central America and North America. In North America its range includes southern Mexico, the southern, and northwestern United States.
Acentrella turbida is a species of small minnow mayfly in the family Baetidae. It is found in Central America and North America. In North America its range includes all of Canada, northern Mexico, and at least 43 of the 50 states within the United States, including Alaska No common name has been given to this insect.
Baetis brunneicolor is a species of small minnow mayfly in the family Baetidae. It is found in all of Canada, the northern, and southeastern United States.
Baetis pluto is a species of small minnow mayfly in the family Baetidae. It is found in North America.
