Troutnut.com Fly Fishing for Trout Home
User Password
or register.
Scientific name search:

Mayfly Genus Rhithrogena

Taxonomic Navigation -?-
Species in RhithrogenaNumber of SpecimensNumber of Pictures
Rhithrogena futilisWestern Gordon Quill00
Rhithrogena hageniWestern Black Quill00
Rhithrogena impersonataDark Red Quill319
Rhithrogena jejunaDark Red Quill00
Rhithrogena manifesta00
Rhithrogena morrisoniWestern March Brown416
Rhithrogena robusta25
Rhithrogena undulataSmall Western Red Quill00
Rhithrogena virilis529

14 species aren't included.
Pictures Below

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

  • The behavior and habitat of Rhithrogena.

Pictures of 25 Mayfly Specimens in the Genus Rhithrogena:

Specimen Page:1234
Rhithrogena impersonata (Dark Red Quill) Mayfly NymphRhithrogena impersonata (Dark Red Quill) Mayfly Nymph View 6 PicturesThis was the only Rhithrogena specimen in a large sample of nymphs from a small Catskill stream. It looks virtually identical to Rhithrogena impersonata specimens collected in the Midwest, but I didn't get to check the distinguishing features under a microscope.
Collected April 19, 2006 from Mongaup Creek in New York
Added to Troutnut.com by Troutnut on April 21, 2006
Rhithrogena morrisoni (Western March Brown) Mayfly NymphRhithrogena morrisoni (Western March Brown) Mayfly Nymph View 4 PicturesSize - (excluding tails) - 12 mm
Status at time of photo - preserved, but photographed within days of capture.

W. C. Day, Aquatic Insects of California differentiates morrisoni nymphs by submedian pale dots on tergites (
One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.
One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.
Tergite: The top (dorsal) part of a single segment on an insect's abdomen when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.
)
8 & 9, which look to be in evidence. This is one of the "super-hatches" on this river that can be prolific March through April.

Entoman
Collected March 3, 2011 from the Lower Yuba River in California
Added to Troutnut.com by Entoman on November 1, 2011
Rhithrogena virilis Mayfly NymphRhithrogena virilis  Mayfly Nymph View 2 PicturesBefore I reared this specimen the nymphs were unknown. See Western North American Naturalist for the paper on the description of this species' nymph.
Collected April 4, 2007 from the Big Thompson River in Montana
Added to Troutnut.com by Bnewell on June 26, 2011
Male Rhithrogena Mayfly DunMale Rhithrogena  Mayfly Dun View 2 Pictures
Collected May 27, 2005 from the Vermillion River in Montana
Added to Troutnut.com by Bnewell on June 28, 2011
Male Rhithrogena Mayfly SpinnerMale Rhithrogena  Mayfly Spinner View 11 PicturesThis male was collected at the same time as this female and is likely the same species.
Collected July 1, 2019 from the Madison River in Montana
Added to Troutnut.com by Troutnut on July 18, 2019
Rhithrogena Mayfly NymphRhithrogena  Mayfly Nymph View 1 Pictures
Collected May 12, 2005 from Hungry Horse Creek in Montana
Added to Troutnut.com by Bnewell on June 28, 2011
Rhithrogena Mayfly NymphRhithrogena  Mayfly Nymph View 1 PicturesBased on the lack of coloration and the two bars on the last tergite (
One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.
One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.
Tergite: The top (dorsal) part of a single segment on an insect's abdomen when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.
)
this may be Rhithrogena virilis.
Collected May 12, 2005 from Hungry Horse Creek in Montana
Added to Troutnut.com by Bnewell on June 28, 2011
Rhithrogena Mayfly NymphRhithrogena  Mayfly Nymph View 1 PicturesNote the unusual red coloration of these Rhithrogena nymphs.
Collected July 17, 2008 from Rock Creek in Montana
Added to Troutnut.com by Bnewell on June 26, 2011
Specimen Page:1234
Top 10 Fly Hatches
Top Gift Shop Designs
Top Insect Specimens
Miscellaneous Sites