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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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Male Epeorus (Little Maryatt) Mayfly Dun Pictures

This Epeorus dun managed to emerge successfully even though it had apparently long several legs at some point and only partially grown them back.

Ruler view of a Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York The smallest ruler marks are 1 mm.
Lateral view of a Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York
Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York
Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York
Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York
Dorsal view of a Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York
Ventral view of a Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York

This mayfly was collected from the West Branch of the Delaware River in New York on May 15th, 2007 and added to Troutnut.com by Troutnut on May 18th, 2007.


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Male Epeorus (Little Maryatt) Mayfly Dun Pictures

Collection details
Location: West Branch of the Delaware River, New York
Date: May 15th, 2007
Added to site: May 18th, 2007
Author: Troutnut
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