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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
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.

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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Paragnetina media (Embossed Stonefly) Stonefly Nymph Pictures

Paragnetina media (Perlidae) (Embossed Stonefly) Stonefly Nymph from Cascadilla Creek in New York
Dorsal view of a Paragnetina media (Perlidae) (Embossed Stonefly) Stonefly Nymph from Cascadilla Creek in New York
Ventral view of a Paragnetina media (Perlidae) (Embossed Stonefly) Stonefly Nymph from Cascadilla Creek in New York

This stonefly was collected from Cascadilla Creek in New York on March 13th, 2005 and added to Troutnut.com by Troutnut on April 5th, 2006.

Discussions of this Nymph

Probably an immature Paragnetina media
2 replies
Posted by GONZO on Oct 4, 2006
Last reply on Jan 19, 2010 by Dkak
The row of spinules, absence of anal gills, and overall hairiness are all consistent with immature P. media. (The mature nymphs are cleaner, darker, and less hairy.)

I would also suggest altering the Paragnetina page to say that media is very important in both the East and Midwest. (media is probably the most widespread and commonly encountered large member of the Perlidae in the East. Due to its tolerance and adaptability it is often found in streams that have few other stonefly species.) The "accepted" (Stark, et al.) common names are Embossed Stone for media and Beautiful Stone for immarginata.

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Paragnetina media (Embossed Stonefly) Stonefly Nymph Pictures

Collection details
Location: Cascadilla Creek, New York
Date: March 13th, 2005
Added to site: April 5th, 2006
Author: Troutnut
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