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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Posts: 24
Isidro on Mar 3, 2008March 3rd, 2008, 6:57 pm EST
I don't know how in Earth I gave this identification, years ago, to this very common mayfly in my zone. Maybe looking a book I've found one similar with this name. But unfortunately, there are any adult picture of Choroterpes in the web. Leptophlebiidae is sure, and females are very difficut to see, while the males (turbinate eyes) are very common into my city (Zaragoza, NE Spain). Posterior wings are very small, and costal zone very dark. Wingspan is about 15 mm. Two cerci.
The rivers of the zone are big, deep, contaminated and slow.

Thanks a lot.
Konchu's profile picture
Site Editor

Posts: 498
Konchu on Mar 4, 2008March 4th, 2008, 2:59 pm EST
The eyes are hard to see from my machine, but could this be a baetid? Why do you assume Leptophlebiidae?
Posts: 24
Isidro on Mar 4, 2008March 4th, 2008, 7:15 pm EST
Thanks Konchu. Maybe it's a baetid, but due to elongate wings, turbinate eyes, posterior wings present... I thinked that was identical to Leptophlebiidae. Now I need a genus -and, if it's possible, species- level identification ;-)
Posts: 24
Isidro on Mar 10, 2008March 10th, 2008, 3:53 am EDT
Anybody.... ? :-(
Troutnut's profile picture
Bellevue, WA

Posts: 2758
Troutnut on Mar 11, 2008March 11th, 2008, 4:41 pm EDT
It looks like a Baetid to me, too. The features you listed aren't incompatible with that ID. As for species and genus, I doubt we can be of much help. Even a series of high-quality closeups like I've got on this site often isn't sufficient to figure out genus and species for Baetid mayflies, even well-known American species.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Posts: 24
Isidro on Mar 11, 2008March 11th, 2008, 10:43 pm EDT
Many thanks Jason. Then, is not a Choroterpes but a Baetid... It's a pity that the ID was impossible...
Posts: 24
Isidro on May 18, 2008May 18th, 2008, 12:57 am EDT
There is a lost answer??? taxon answered the last, in the forum says "6 answers", but I entrer and see my answer the last and only 5 answers...
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on May 18, 2008May 18th, 2008, 2:23 pm EDT

Not a lost answer, just a deleted answer. Taxon had just run across a photo of dun with a fore wing which was similar to the one in your photo, and impulsively posted a comment, but promptly changed his mind and deleted it. Incidentally, the photo was in the book Trout Fly Recognition by John Goddard, and the photo was labeled Leptophlebia vespertina female dun.
Best regards,
Roger Rohrbeck

Posts: 14
And on Jun 4, 2008June 4th, 2008, 10:40 am EDT
Hello Isidro,

Choroterpes (like all Leptophlebiidae) has always 3 cerci


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