Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana

Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Middle Fork Snoqualmie

From the Middle Fork Snoqualmie River in Washington

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

This seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.

7 Recently Added Photos

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.

ID on this little olive?

Female Attenella margarita (Little Western Blue-Winged Olive) Mayfly Dun

6 Pictures

Lateral view of a Female Attenella margarita (Ephemerellidae) (Little Western Blue-Winged Olive) Mayfly Dun from Willowemoc Creek in New York

I found this dun unusually late in the year for anything in the Ephemerellidae family in the East. It's also small for that family.

Collected September 3, 2006 from Willowemoc Creek in New York

Added by Troutnut on October 3, 2006

Collected September 3, 2006 from Willowemoc Creek in New York and added by Troutnut on October 3, 2006

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Oct 3, 2006October 3rd, 2006, 3:15 pm EDT

My Ephemerellidae keys are pretty much garbage when it comes to identifying female duns. I'm wondering if anybody has any insight on this one based on personal experience.

There can't be all that many tiny olive Ephemerellids hatching in September. My tentative guess would be Serratella.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Oct 3, 2006October 3rd, 2006, 6:41 pm EDT

Jason-

I'm reasonably confident that it's Attenella margarita.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Oct 4, 2006October 4th, 2006, 6:08 am EDT

OK, I'll move it there for now. What makes you sure?

I looked through all the scientific papers I have on the likely species again and can't find anything useful. I really wish they described the females and the duns more often.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Oct 4, 2006October 4th, 2006, 9:23 am EDT

Jason-

Take a look at Fauceglia p. 67. It’s the best photo I’ve found of a Attenella female dun. Incidentally, I hadn’t yet discovered that photo when I offered the earlier opinion, but that reinforced my opinion.

In any event, there are a number of factors, which taken together, convinced me:
- dorsal pointed finger-like meso-thoractic projection
- hind wing costal projection
- body coloration
- size
- early Sep. emergence
- presence in NY

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com