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There is remarkable variety of form and color within this prolific genus of fast-water mayflies. Different species are found across the country, and several cause good hatches. Fly anglers are likely to encounter the lesser species on occasion, too.
The best Epeorus hatch in the East is Epeorus pleuralis, the famous Quill Gordon, the first abundant large mayfly hatch of the year. Epeorus vitreus comes a little later and is important in both the East and Midwest.
In the West, Epeorus longimanus dominates in fast, high-altitude streams, while Epeorus albertae inhabits slower and lower waters. Read more...
There are 37 more specimens...
| Troutnut | May 3rd, 2007, 10:39 am | |
The Admin Fairbanks, AKPosts: 2021 | There has been some discussion here before about Epeorus identification, especially the distance between the eyes of the adult males, which is one identifying characteristic. The keys say that the distance should be "less than the width of the median ocellus," but I have collected a few male duns that didn't quite fit that requirement. We figured they were Epeorus anyway, so it's not a big deal, but a new specimen I collected sheds a bit of light on the question. I collected a dun whose eyes were also a bit far apart, which you can see here: http://www.troutnut.com/specimen/681 Then it molted into a spinner: http://www.troutnut.com/specimen/682 The spinner's eyes were really almost touching, well within the description of the genus. So that answers our question: the duns may have a little wider spread and the gap will close up in the spinners. | |
| Jason Neuswanger The Troutnut | ||
| Title | Replies | Last Reply |
| Re: Thoughts on this Heptageniid's ID? In Male Epeorus vitreus Mayfly Dun by Troutnut | 1 | Oct 28, 2008 by GONZO |
| Re: if bass and carp are o.k., what about tarpon and permit? In the Photography Board by Gutcutter | 4 | Feb 24, 2010 by Gutcutter |
| Re: What genus is this Heptageniid? In Female Rhithrogena Mayfly Spinner by Troutnut | 4 | Feb 1, 2009 by Taxon |
| Re: A mystery late-season Epeorus In Male Epeorus frisoni Mayfly Dun by Troutnut | 4 | Oct 5, 2006 by GONZO |
| Re: confusing local names+ In Ephemerella needhami Mayfly Dun by Gutcutter | 4 | Dec 22, 2009 by Oldredbarn |
| Re: Stumper In the Identify This! Board by JOHNW | 8 | Jul 28, 2007 by Martinlf |
| Re: Big Spinner In the Identify This! Board by Al514 | 3 | Jun 18, 2007 by Konchu |
| Re: Maybe Epeorus In Male Nixe inconspicua Mayfly Dun by Troutnut | 16 | Sep 22, 2011 by Oldredbarn |
| Re: Spinner ID? In General Discussion by Martinlf | 3 | Apr 29, 2007 by GONZO |
| Up-to-date with the latest mayfly species In General Discussion by Troutnut | 0 |
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