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Mayfly Genus Heptagenia

Taxonomic Navigation -?-
Species in HeptageniaNumber of SpecimensNumber of Pictures
Heptagenia adaequata22
Heptagenia culacantha24
Heptagenia diabasia00
Heptagenia elegantulaPale Evening Dun16
Heptagenia pullaGolden Dun213
Heptagenia solitariaGinger Quill38

6 species aren't included.
Pictures Below

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

  • The behavior and habitat of Heptagenia.

Pictures of 11 Mayfly Specimens in the Genus Heptagenia:

Specimen Page:12
Heptagenia solitaria (Ginger Quill) Mayfly AdultHeptagenia solitaria (Ginger Quill) Mayfly Adult View 4 PicturesThis species is common in the Flathead River below Kerr Day. The river here is fairly warm with a cobble and boulder bottom with heavy periphyton at times. This species is not common elsewhere in western Montana.
Collected July 4, 2005 from the Flathead River-lower in Montana
Added to by Bnewell on June 28, 2011
Male Heptagenia culacantha Mayfly SpinnerMale Heptagenia culacantha  Mayfly Spinner View 1 PicturesThis photo was provided by guide Eric Naguski along with the following comments, "I took this photo just upstream of Three Mile Island on the east shore of the Susquehanna River just below where the Swatara Creek enters. The Susquehanna is not an easy river to sample for bugs in my opinion. It is very large and pushes a lot of water. Especially in the spring when you would collect mature culacantha nymphs. And I don't believe that there are a ton of these Heptageniids around. Also the people who are doing most of the sampling like myself are doing so for water quality monitoring work so they only take the specimens down to genus-level taxonomy".
Collected October 22, 2011 from the Susquehanna River in Pennsylvania
Added to by Entoman on February 10, 2012
Heptagenia pulla (Golden Dun) Mayfly NymphHeptagenia pulla (Golden Dun) Mayfly Nymph View 11 PicturesThis specimen is interesting because Heptagenia pulla has not been reported from Washington or neighboring states (Saskatchewan is the closest), yet the distinctive key characteristics are clear.

It keys to the genus Heptagenia because the tarsal claw (Tarsal claw: The claws at the tip of the tarsus, on an insect's "foot.") has a single basal (Basal: close to the base; root or beginning) tooth, and the gills on segment 7 have fibrils.

For the species key:
1. The left mandible (Mandible: The paired jaws of an insect which are used for grabbing food, located immediately behind the labrum.) is planate (fairly straight-edged) whereas the right mandible (Mandible: The paired jaws of an insect which are used for grabbing food, located immediately behind the labrum.) is angulate (has one sharp turn on the edge).
2. The labrum (Labrum: The platelike structure forming the roof of the mouth of insects; the upper lip.) is much wider than long.
3. There's a thin light-colored streak lateral (Lateral: To the side.) to the eye on the head.
Collected April 9, 2021 from the Yakima River in Washington
Added to by Troutnut on April 12, 2021
Male Heptagenia culacantha Mayfly DunMale Heptagenia culacantha  Mayfly Dun View 3 PicturesHyun Kounne generously provided photos of the striking, hard-to-find Heptagenia culacantha from the mainstem Delaware River. She mentioned it was one of maybe half a dozen she saw on the water that day.
Collected June 3, 2017 from the Delaware River in New York
Added to by Troutnut on December 5, 2019
Male Heptagenia adaequata Mayfly SpinnerMale Heptagenia adaequata  Mayfly Spinner View 0 PicturesCollected near the Columbia River at Pasco, WA.
Collected July 22, 2012 from the Columbia River in Washington
Added to by Bnewell on July 26, 2012
Specimen Page:12
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