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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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Odonata-Zygoptera (Damselfly) Insect Adult Pictures

Lateral view of a Odonata-Zygoptera (Damselfly) Insect Adult from the Madison River in Montana
Odonata-Zygoptera (Damselfly) Insect Adult from the Madison River in Montana
Odonata-Zygoptera (Damselfly) Insect Adult from the Madison River in Montana
Dorsal view of a Odonata-Zygoptera (Damselfly) Insect Adult from the Madison River in Montana
Odonata-Zygoptera (Damselfly) Insect Adult from the Madison River in Montana
Ruler view of a Odonata-Zygoptera (Damselfly) Insect Adult from the Madison River in Montana The smallest ruler marks are 1 mm.
Odonata-Zygoptera (Damselfly) Insect Adult from the Madison River in Montana
Ventral view of a Odonata-Zygoptera (Damselfly) Insect Adult from the Madison River in Montana

This insect was collected from the Madison River in Montana on June 30th, 2019 and added to Troutnut.com by Troutnut on July 17th, 2019.


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Odonata-Zygoptera (Damselfly) Insect Adult Pictures

Collection details
Location: Madison River, Montana
Date: June 30th, 2019
Added to site: July 17th, 2019
Author: Troutnut
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