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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 Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their 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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Drunella cornuta (Large Blue-Winged Olive) Mayfly Nymph Pictures

Ruler view of a Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from Paradise Creek in Pennsylvania The smallest ruler marks are 1 mm.
Ventral view of a Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from Paradise Creek in Pennsylvania
Dorsal view of a Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from Paradise Creek in Pennsylvania
Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from Paradise Creek in Pennsylvania

This mayfly was collected from Paradise Creek in Pennsylvania on May 29th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.


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Drunella cornuta (Large Blue-Winged Olive) Mayfly Nymph Pictures

Collection details
Location: Paradise Creek, Pennsylvania
Date: May 29th, 2007
Added to site: June 4th, 2007
Author: Troutnut
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