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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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Female Helopicus subvarians (Springfly) Stonefly Adult Pictures

I caught this female during her egg-laying flight.

Ruler view of a Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York The smallest ruler marks are 1 mm.
Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York
Lateral view of a Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York
Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York
Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York
Ventral view of a Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York
Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York
Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York
Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York
Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York
Dorsal view of a Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York
Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York

This stonefly was collected from the West Branch of the Delaware River in New York on June 7th, 2007 and added to Troutnut.com by Troutnut on June 8th, 2007.

Discussions of this Adult

Gorgeous photos!
13 replies
Posted by Jmd123 on Aug 26, 2009
Last reply on Jan 28, 2011 by Entoman
What a beautiful insect! You know, I feel sorry for all of those people who hate and fear six-legged creatures - they have no idea what wonders and treasures they are missing. Of course, my M.S. in entomology may bias my opinion...

Jonathon
Cool Perlid
3 replies
Posted by Troutnut on Jun 8, 2007
Last reply on Apr 7, 2010 by GONZO
The dark abdomen on this one is pretty striking. Does anyone know what species this is?

Start a Discussion of Adult

Female Helopicus subvarians (Springfly) Stonefly Adult Pictures

Collection details
Location: West Branch of the Delaware River, New York
Date: June 7th, 2007
Added to site: June 8th, 2007
Author: Troutnut
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