Family Flatheaded Mayflies (Heptageniidae)
Heptageniidae is a family in the order Ephemeroptera. Browse 75 named species recorded in this family, or open an individual profile for its available identification and natural-history information.
Species in Heptageniidae (75)
Epeorus pleuralis
Epeorus pleuralis
"This species is the first Eastern Epeorus to emerge each season, and is also one of the most famous mayflies in American fly-fishing literature. It is known as the "quill Gordon," and it was named for a fly pattern created by Theodore Gordon - the C
Maccaffertium smithae
Maccaffertium smithae
Identification: "From everything I have read the only possible species that fits this sample is (Maccaffertium smithae) it also has the right geographical range. The fact that the spiracular spots are well above the spirical folds and it has the medi
Stenacron interpunctatum
Stenacron interpunctatum
Identification: ID is very difficult. They cannot be ID'd reliably based upon tergal or sternal coloration. Removal of the left mandible and both maxillae are required for proper ID. The setae on the maxilla are commonly missing or broken so close in
Stenonema femoratum
Stenonema femoratum
Identification: Adults have a combination of four diagnostic traits: (adapted from comment by Lloyd Gonzales here ) male: female:
Cinygma dimicki
Cinygma dimicki
Cinygma integrum
Cinygma integrum
Cinygma lyriforme
Cinygma lyriforme
Cinygmula reticulata
Cinygmula reticulata
Cinygmula subaequalis
Cinygmula subaequalis
Little Slate-Winged Dun
Ecdyonurus criddlei
Ecdyonurus simplicioides
Ecdyonurus simplicioides
Large Brook Dun
Ecdyonurus torrentis
Epeorus albertae
Epeorus albertae
Epeorus deceptivus
Epeorus deceptivus
Epeorus dispar
Epeorus dispar
Epeorus dulciana
Epeorus dulciana
Epeorus fragilis
Epeorus fragilis
Epeorus grandis
Epeorus grandis
Epeorus longimanus
Epeorus longimanus
Epeorus margarita
Epeorus margarita
Epeorus namatus
Epeorus namatus
Epeorus permagnus
Epeorus permagnus
Epeorus punctatus
Epeorus punctatus
Epeorus suffusus
Epeorus suffusus
Epeorus vitreus
Epeorus vitreus
Heptagenia adaequata
Heptagenia adaequata
Heptagenia culacantha
Heptagenia culacantha
Heptagenia elegantula
Heptagenia elegantula
Heptagenia flavescens
Heptagenia flavescens
Heptagenia marginalis
Heptagenia marginalis
Heptagenia pulla
Heptagenia pulla
Heptagenia solitaria
Heptagenia solitaria
Yellow May Dun
Heptagenia sulphurea
Ironodes lepidus
Ironodes lepidus
Ironodes nitidus
Ironodes nitidus
Leucrocuta aphrodite
Leucrocuta aphrodite
Leucrocuta hebe
Leucrocuta hebe
Leucrocuta jewetti
Leucrocuta jewetti
Leucrocuta juno
Leucrocuta juno
Leucrocuta maculipennis
Leucrocuta maculipennis
Leucrocuta minerva
Leucrocuta minerva
Leucrocuta petersi
Leucrocuta petersi
Leucrocuta thetis
Leucrocuta thetis
Leucrocuta umbratica
Leucrocuta umbratica
Leucrocuta walshi
Leucrocuta walshi
Maccaffertium carlsoni
Maccaffertium carlsoni
Maccaffertium exiguum
Maccaffertium exiguum
Maccaffertium ithaca
Maccaffertium ithaca
Maccaffertium luteum
Maccaffertium luteum
Maccaffertium mediopunctatum
Maccaffertium mediopunctatum
Maccaffertium meririvulanum
Maccaffertium meririvulanum
Maccaffertium mexicanum
Maccaffertium mexicanum
Maccaffertium modestum
Maccaffertium modestum
Maccaffertium pudicum
Maccaffertium pudicum
Maccaffertium pulchellum
Maccaffertium pulchellum
Maccaffertium terminatum
Maccaffertium terminatum
March Brown Mayfly
Maccaffertium vicarium
Nixe horrida
Nixe horrida
Nixe inconspicua
Nixe inconspicua
Nixe lucidipennis
Nixe lucidipennis
Nixe rusticalis
Nixe rusticalis
Raptoheptagenia cruentata
Raptoheptagenia cruentata
Rhithrogena anomala
Rhithrogena anomala
Rhithrogena brunneotincta
Rhithrogena brunneotincta
Rhithrogena flavianula
Rhithrogena flavianula
Rhithrogena hageni
Rhithrogena hageni
Rhithrogena impersonata
Rhithrogena impersonata
Rhithrogena manifesta
Rhithrogena manifesta
Spinadis simplex
Spinadis simplex
Stenacron candidum
Stenacron candidum
Stenacron carolina
Stenacron carolina
Stenacron floridense 0
Stenacron floridense
Stenacron gildersleevei
Stenacron gildersleevei
Stenacron minnetonka
Stenacron minnetonka
Stenacron pallidum
Stenacron pallidum