Cinygmula is a genus of flatheaded mayflies in the family Heptageniidae. There are at least 30 described species in Cinygmula.
Epeorus is a genus of mayflies in the family Heptageniidae.
Heptagenia is a genus of flatheaded mayflies in the family Heptageniidae. There are at least 20 described species in Heptagenia.
Leucrocuta is a genus of mayflies in the family Heptageniidae.
Acentrella is a genus of small minnow mayflies in the family Baetidae. Species of Acentrella are recorded from Europe, North America and Asia, with a few from Africa.
Fallceon is a genus of blue-winged olives in the family of mayflies called Baetidae. There are about 19 described species in Fallceon.
Heterocloeon is a genus of small minnow mayflies in the family Baetidae. There are about nine described species in Heterocloeon.
Paraleptophlebia is a genus of mayflies in the family Leptophlebiidae. Commonly found in North America, Britain, and parts of Western Europe.
Traverella is a genus of pronggilled mayflies in the family Leptophlebiidae.
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.
Hexagenia is a genus of mayfly in the family Ephemeridae, the common burrower mayflies.
Drunella is a genus of spiny crawler mayflies in the family Ephemerellidae. There are at least 20 described species in Drunella.
Tricorythodes is a genus of little stout crawler mayflies in the family Leptohyphidae. There are about 16 described species in Tricorythodes.
Ephemerella is a genus of spiny crawler mayflies in the family Ephemerellidae. There are about 19 described species in Ephemerella.
Procloeon rubropictum is a species of small minnow mayfly in the family Baetidae. It is found in the southern half of Canada and the eastern United States.
Ameletus is a genus of mayfly and the type genus of the family Ameletidae.
Isonychia is a genus of brushlegged mayflies in the family Isonychiidae, the sole genus of the family. There are more than 30 described species in Isonychia.
Plauditus is a genus of small minnow mayflies in the family Baetidae. There are about 10 described species in Plauditus.
Siphlonurus is a genus of primitive minnow mayflies in the family Siphlonuridae. There are more than 40 described species in Siphlonurus.
Eurylophella is a genus of spiny crawler mayflies in the family Ephemerellidae. There are about 18 described species in Eurylophella.
