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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 Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
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 Malenka tina (Tiny Winter Black) Stonefly Adult Pictures

This is the smallest stonefly I've ever collected, with a body only 5.5 mm long.

Although not in-focus in my pictures, its first tarsal segment is similar in length to the third, while the second is much shorter. This helps with family-level identification.

Examining this specimen under a microscope shows a membranous lobe on the dorsal base of the cerci, which is the key characteristic in Merritt & Cummins (4th ed.) to place the genus definitively as Malenka.

Following the species key in Jewett Jr's Stoneflies of the Pacific Northwest, the species appears to be Malenka tina. My dissecting microscope seems to show sternite 9 ending in a rounded knob, which distinguishes it from Malenka bifurcata, but the detail is hard to work out.

Also worth noting is that Montana appears to have this species, whereas birfucata is not know there: http://fieldguide.mt.gov/displaySpecies.aspx?family=Nemouridae

Lateral view of a Male Malenka tina (Nemouridae) (Tiny Winter Black) Stonefly Adult from the Madison River in Montana
Male Malenka tina (Nemouridae) (Tiny Winter Black) Stonefly Adult from the Madison River in Montana
Male Malenka tina (Nemouridae) (Tiny Winter Black) Stonefly Adult from the Madison River in Montana
Dorsal view of a Male Malenka tina (Nemouridae) (Tiny Winter Black) Stonefly Adult from the Madison River in Montana
Ventral view of a Male Malenka tina (Nemouridae) (Tiny Winter Black) Stonefly Adult from the Madison River in Montana
Ruler view of a Male Malenka tina (Nemouridae) (Tiny Winter Black) Stonefly Adult from the Madison River in Montana The smallest ruler marks are 1 mm.
Male Malenka tina (Nemouridae) (Tiny Winter Black) Stonefly Adult from the Madison River in Montana

This stonefly was collected from the Madison River in Montana on July 1st, 2019 and added to Troutnut.com by Troutnut on July 18th, 2019.


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Male Malenka tina (Tiny Winter Black) Stonefly Adult Pictures

Collection details
Location: Madison River, Montana
Date: July 1st, 2019
Added to site: July 18th, 2019
Author: Troutnut
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