Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Stream photos

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Epeorus albertae (Pink Lady) Mayfly Nymph Epeorus albertae (Pink Lady) Mayfly Nymph

Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington

This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.

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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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Taenionema atlanticum (Atlantic Willowfly) Stonefly Nymph Pictures

Ventral view of a Taenionema atlanticum (Taeniopterygidae) (Willowfly) Stonefly Nymph from Mystery Creek #62 in New York

Dorsal view of a Taenionema atlanticum (Taeniopterygidae) (Willowfly) Stonefly Nymph from Mystery Creek #62 in New York

Taenionema atlanticum (Taeniopterygidae) (Willowfly) Stonefly Nymph from Mystery Creek #62 in New York

Ruler view of a Taenionema atlanticum (Taeniopterygidae) (Willowfly) Stonefly Nymph from Mystery Creek #62 in New York The smallest ruler marks are 1 mm.

This stonefly was collected from Mystery Creek #62 in New York on April 1st, 2007 and added to Troutnut.com by Troutnut on April 3rd, 2007.

Discussions of this Nymph

Podmosta identification...

6 replies

Posted by PeterO on Apr 25, 2007

Last reply on Apr 25, 2007 by Troutnut

This is actually a specimen of the family Taeniopterygidae, probably Taenionema atlanticum. Notice the large sternal plate at the apex of the abdomen. This plate is used in drumming behavior. Adult Taeniopterygids mimic the sounds of male Ruffed Grouse in an attempt to draw in female grouse to parasitize. They attach themselves at the base of the beak and feed until gorged. They then mate, smoke a cigarette, lay some eggs, and die. On a serious note, all Taeniopterygids except species of Taeniopteryx, have the drumming plate. Nemourids are lacking this feature. There is a difference in the second tarsal segment as well. Happy Bugging!

PeterO

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