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Mayfly Family Heptageniidae (March Browns, Cahills, Quill Gordons)

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» Family Heptageniidae (March Browns, Cahills, Quill Gordons)
Genus in HeptageniidaeNumber of SpecimensNumber of Pictures
CinygmaWestern Light Cahills12
CinygmulaDark Red Quills20103
EcdyonurusWestern Ginger Quills11
EpeorusLittle Maryatts46260
Heptagenia930
Ironodes13
Leucrocuta1158
MaccaffertiumMarch Browns and Cahills59270
Nixe113
Rhithrogena2185
StenacronLight Cahills847
Stenonema16

4 genera aren't included.
Common Name
Pictures Below

This is page 2 of specimens of Heptageniidae. Visit the main Heptageniidae page for:

  • The behavior and habitat of Heptageniidae.
  • 11 underwater pictures of Heptageniidae.

Pictures of 188 Mayfly Specimens in the Family Heptageniidae:

Specimen Page:1234...20
Male Rhithrogena virilis Mayfly SpinnerMale Rhithrogena virilis  Mayfly Spinner View 12 PicturesI'm fairly sure this is a specimen of Rhithrogena virilis based on closeup examination of the reproductive anatomy under the microscope (not shown in photos). The other other species of Rhithrogena this large is Rhithrogena flavianula, but the key in Needham's Biology of Mayflies mentions annulation in the abdomen (visible in some images on bugguide.net) more distinct than that on this specimen.

The body and front wing were both about 15.5 mm long, while the cerci (Cercus: The left and right "tails" of an insect are known as the cerci or caudal cerci. The middle tail of a three-tailed insect is not.) were 40 mm long.
Collected July 5, 2017 from the South Fork Sauk River in Washington
Added to Troutnut.com by Troutnut on July 6, 2017
Male Nixe inconspicua Mayfly DunMale Nixe inconspicua  Mayfly Dun View 13 PicturesThis pretty little dun was part of a sparse midsummer evening hatch on a large Catskill river.

I could not identify it by following a species key step by step, but I tentatively keyed it to the genus Nixe, and based on distribution maps and physical descriptions the most likely species is Nixe inconspicua.
Collected July 13, 2005 from the East Branch of the Delaware River in New York
Added to Troutnut.com by Troutnut on April 14, 2006
Male Epeorus (Little Maryatts) Mayfly DunMale Epeorus (Little Maryatts) Mayfly Dun View 12 PicturesI hoped this dun would molt into a spinner for a positive ID, but it didn't. My best guess is Epeorus dulciana, but that's only because that's the smallest western Epeorus species, and this specimen is smaller than any of the others, with a body length of 5.3 mm (although it would be longer as a spinner) and a wing length of 8.5 mm.

It was collected at the same time as a similar-sized female dun.
Collected July 5, 2017 from the South Fork Sauk River in Washington
Added to Troutnut.com by Troutnut on July 6, 2017
Male Cinygmula (Dark Red Quills) Mayfly SpinnerMale Cinygmula (Dark Red Quills) Mayfly Spinner View 11 PicturesI'm unsure of the ID on this one; keys put it closest to Cinygmula reticulata, but I'm very doubtful of the species and not positive on the genus. Epeorus is another possibility, but I don't know which species it would be.

This one was collected in association with a female dun probably of the same species.
Collected July 1, 2017 from the South Fork Stillaguamish River in Washington
Added to Troutnut.com by Troutnut on July 2, 2017
Cinygmula subaequalis (Small Gordon Quill) Mayfly NymphCinygmula subaequalis (Small Gordon Quill) Mayfly Nymph View 10 PicturesThis nymph is missing a few gills, but is otherwise in good shape. It was the only one of its species which turned up in my sample.
Collected May 29, 2007 from Paradise Creek in Pennsylvania
Added to Troutnut.com by Troutnut on June 4, 2007
Male Maccaffertium vicarium (March Brown) Mayfly DunMale Maccaffertium vicarium (March Brown) Mayfly Dun View 10 PicturesI collected this mayfly on the same trip as a female of the same species. After these photos it molted into a spinner. This is the form of Maccaffertium vicarium which anglers call the "Gray Fox."
Collected May 28, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 24, 2006
Female Maccaffertium ithaca (Light Cahill) Mayfly DunFemale Maccaffertium ithaca (Light Cahill) Mayfly Dun View 10 PicturesThis female looks very much like a male I collected a few hundred miles away a few days later, so I'm guessing it's the same species, which I believe is Maccaffertium mediopunctatum.
Collected May 23, 2007 from the Little Juniata River in Pennsylvania
Added to Troutnut.com by Troutnut on June 4, 2007
Cinygmula ramaleyi (Small Western Gordon Quill) Mayfly NymphCinygmula ramaleyi (Small Western Gordon Quill) Mayfly Nymph View 9 PicturesThis nymph is almost definitely the same species as this dun, which hatched from a nearly identical nymph from the same collection.
Collected July 10, 2011 from Nome Creek in Alaska
Added to Troutnut.com by Troutnut on July 13, 2011
Specimen Page:1234...20
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