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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.

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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Male Agnetina capitata (Golden Stone) Stonefly Adult Pictures

This stonefly emerged in my aquarium, and unfortunately I severely damaged its wings just trying to catch it. It's still an interesting specimen, especially since I was able to also photograph the nymphal shuck it emerged from. I was surprised by just how light it was shortly after emerging. I photographed it a couple days later when it had darkened considerably; it was a pale, almost pastel yellow at first.

Male Agnetina capitata (Perlidae) (Golden Stone) Stonefly Adult from Aquarium in New York
Male Agnetina capitata (Perlidae) (Golden Stone) Stonefly Adult from Aquarium in New York
Lateral view of a Male Agnetina capitata (Perlidae) (Golden Stone) Stonefly Adult from Aquarium in New York
Male Agnetina capitata (Perlidae) (Golden Stone) Stonefly Adult from Aquarium in New York
Male Agnetina capitata (Perlidae) (Golden Stone) Stonefly Adult from Aquarium in New York
Male Agnetina capitata (Perlidae) (Golden Stone) Stonefly Adult from Aquarium in New York
Male Agnetina capitata (Perlidae) (Golden Stone) Stonefly Adult from Aquarium in New York
I forgot to photograph it on the ruler, so I did it a couple days later, but the fly had died and shriveled a little bit by then.

Ruler view of a Male Agnetina capitata (Perlidae) (Golden Stone) Stonefly Adult from Aquarium in New York The smallest ruler marks are 1 mm.
Male Agnetina capitata (Perlidae) (Golden Stone) Stonefly Adult from Aquarium in New York

This stonefly was collected from Aquarium in New York on May 1st, 2007 and added to Troutnut.com by Troutnut on May 3rd, 2007.

Discussions of this Adult

Agnetina capitata
6 replies
Posted by DOS on Mar 28, 2009
Last reply on Mar 29, 2009 by GONZO
I had plans to meet a few friends tonight at a local sports bar to watch the UFC fights, but as I got out of the shower, I found that a industrious capitata had hatched in my aquarium and managed to escape its mesh canopy and was mockingly buzzing the lights in my steamy bathroom. Well, several hours later and a six pack of Saranac Black and Tan, I'm still at home and have a question. On page 37 of Schwibert's Nymphs Volume II, he diagnoses the adult at 28mm. My specimen falls more than 10mm short. Is it possible I have misidentified this specimen or is it a simple case of size variation?










Agnetina
Posted by GONZO on May 15, 2007
Last reply on May 15, 2007 by GONZO
Agnetina--probably capitata.

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Male Agnetina capitata (Golden Stone) Stonefly Adult Pictures

Collection details
Location: Aquarium, New York
Date: May 1st, 2007
Added to site: May 3rd, 2007
Author: Troutnut
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