The Heptageniidae (synonym: Ecdyonuridae) are a family of mayflies with over 500 described species mainly distributed in the Holarctic, Oriental, and Afrotropical regions, and also present in the Central American Tropics and extreme northern South America.[1] The group is sometimes referred to as flat-headed mayflies or stream mayflies. These are generally rather small mayflies with three long tails. The wings are usually clear with prominent venation although species with variegated wings are known. As in most mayflies, the males have large compound eyes, but not divided into upper and lower parts.
Heptageniids breed mainly in fast-flowing streams, but some species use still waters. The nymphs have a flattened shape and are usually dark in colour. They use a wide range of food sources with herbivorous, scavenging, and predatory species known.
The oldest described member of the family is Amerogenia from the Late Cretaceous (Turonian) aged New Jersey amber.
^Wang, T.-Q; MCCafferty W.P. (March 2004). "Heptageniidae (Ephemeroptera) of the World. Part I: Phylogenetic Higher Classification". Transactions of the American Entomological Society. 130 (1): 11–45. JSTOR 25078834.
The Heptageniidae (synonym: Ecdyonuridae) are a family of mayflies with over 500 described species mainly distributed in the Holarctic, Oriental, and...
Electrogena is a genus of mayflies in the family Heptageniidae. Chinery, Michael (1986). Collins Guide to the Insects of Britain and Western Europe. London:...
some general habitat preferences: the Baetidae favour warm water; the Heptageniidae live under stones and prefer fast-flowing water; and the relatively...
Epeorus vitreus is a species of flatheaded mayfly in the family Heptageniidae. It is found in southeastern Canada and the eastern United States. "Epeorus...
Cinygmula subaequalis is a species of flatheaded mayfly in the family Heptageniidae. It is found in southeastern, northern Canada, the eastern United States...
Rhithrogena is a genus of flatheaded mayflies in the family Heptageniidae. There are at least 150 described species in Rhithrogena. List of Rhithrogena...
Acanthomola is a genus of mayflies in the family Heptageniidae. Chinery, Michael (1986). Collins Guide to the Insects of Britain and Western Europe. London:...
Heptagenia marginalis is a species of flatheaded mayfly in the family Heptageniidae. It is found in North America. "Heptagenia marginalis Report". Integrated...
Maccaffertium mediopunctatum is a species of flat-headed mayfly in the family Heptageniidae. It is found in Southeastern Canada and the Eastern United States. These...
little slate-winged dun, is a species of flatheaded mayfly in the family Heptageniidae. It is found in Central America and North America. In North America...
Maccaffertium pudicum is a species of flatheaded mayfly in the family Heptageniidae. It is found in North America. "Maccaffertium pudicum Report". Integrated...
Maccaffertium vicarium is a species of flatheaded mayfly in the family Heptageniidae. It is found in North America. "Maccaffertium vicarium Report". Integrated...
Ecdyonurus is a genus of mayflies of the family Heptageniidae. These 66 species belong to the genus Ecdyonurus: Ecdyonurus adjaricus g Ecdyonurus alpinus...
Stenonema is a genus of mayflies in the family Heptageniidae. Chinery, Michael (1986). Collins Guide to the Insects of Britain and Western Europe. London:...
Maccaffertium ithaca is a species of flatheaded mayfly in the family Heptageniidae. It is found in North America. "Maccaffertium ithaca Report". Integrated...
Darthus is a genus of mayflies in the family Heptageniidae. Chinery, Michael (1986). Collins Guide to the Insects of Britain and Western Europe. London:...
Maccaffertium pulchellum is a species of flatheaded mayfly in the family Heptageniidae. It is found in North America. "Maccaffertium pulchellum Report". Integrated...
Heptagenia is a genus of flatheaded mayflies in the family Heptageniidae. There are at least 20 described species in Heptagenia. These 27 species belong...
Maccaffertium is a genus of flatheaded mayflies in the family Heptageniidae. There are at least 20 described species in Maccaffertium. These 20 species...
Maccaffertium terminatum is a species of flatheaded mayfly in the family Heptageniidae. It is found in all of Canada. These two subspecies belong to the species...
Arthroplea congener is a species of mayflies belonging to the family Heptageniidae. It is native to Europe. "Arthroplea congener Bengtsson, 1908". www...
Cinygma is a genus of mayflies in the family Heptageniidae. Nymphs move sluggishly and are poor swimmers, nearly always clinging to wood or rocks. Edmunds...
Maccaffertium exiguum is a species of flatheaded mayfly in the family Heptageniidae. It is found in North America. "Maccaffertium exiguum Report". Integrated...
Maccaffertium modestum is a species of flatheaded mayfly in the family Heptageniidae. It is found in North America. "Maccaffertium modestum Report". Integrated...
the stenacron mayfly, is a species of flatheaded mayfly in the family Heptageniidae. It is found in North America. "Stenacron interpunctatum Report". Integrated...
Maccaffertium smithae is a species of flatheaded mayfly in the family Heptageniidae. It is found in North America. "Maccaffertium smithae Report". Integrated...
Epeorus is a genus of mayflies in the family Heptageniidae. Epeorus aculeatus Braasch, 1990 Epeorus aesculus Imanishi, 1934 Epeorus albertae (McDunnough...
Maccaffertium mexicanum is a species of flatheaded mayfly in the family Heptageniidae. It is found in Central America and North America. In North America...
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