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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 Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington
This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
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 flavilinea (Flav) Mayfly Nymph Pictures

Although the identification is not certain because the nymph is not yet mature, the configuration of tubercles on this one--particularly the forefemora--seems to best match Drunella flavilinea.

Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Nymph from the Gallatin River in Montana
Dorsal view of a Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Nymph from the Gallatin River in Montana
Ventral view of a Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Nymph from the Gallatin River in Montana
Ruler view of a Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Nymph from the Gallatin River in Montana The smallest ruler marks are 1 mm.
Lateral view of a Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Nymph from the Gallatin River in Montana
Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Nymph from the Gallatin River in Montana

This mayfly was collected from the Gallatin River in Montana on July 2nd, 2019 and added to Troutnut.com by Troutnut on July 18th, 2019.


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Drunella flavilinea (Flav) Mayfly Nymph Pictures

Collection details
Location: Gallatin River, Montana
Date: July 2nd, 2019
Added to site: July 18th, 2019
Author: Troutnut
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