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

Blue-winged Olives
Baetis

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.

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Psychodidae True Fly Larva Psychodidae True Fly Larva

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington

This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.

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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.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Mayfly: Choroterpes picteti?

Isidro
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.
Regards,
Isidro

Konchu

Site Editor
Indiana

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?

Isidro
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 ;-)

Isidro
Posts: 24

Isidro on Mar 10, 2008March 10th, 2008, 3:53 am EDT

Anybody.... ? :-(

Troutnut

Administrator
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

Isidro
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...

Isidro
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

Site Editor
Plano, TX

Posts: 1311

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

Isidro-

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
www.FlyfishingEntomology.com

And
Europe

Posts: 14

And on Jun 4, 2008June 4th, 2008, 10:40 am EDT

Hello Isidro,

Choroterpes (like all Leptophlebiidae) has always 3 cerci

Greetings
Andrea