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.

A small spring creek in Wisconsin. A little brook trout stream tumbles over boulders

Stream photos

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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.

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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.

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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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