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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Baetis (Blue-Winged Olive) Mayfly Nymph Pictures

Ruler view of a Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #62 in New York The smallest ruler marks are 1 mm.
Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #62 in New York
Dorsal view of a Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #62 in New York
Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #62 in New York
Lateral view of a Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #62 in New York

This mayfly 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

Diphetor
5 replies
Posted by Earlfishman on Apr 11, 2007
Last reply on Apr 13, 2007 by Troutnut
Jason,

I really enjoy your site, you've got some great photos and some really good info. I just wanted to let you know that this mayfly looks like it might actually be a Baetis sp., not a Diphetor hageni. Diphetor's antenna would be much closer together at the base and there would definitely be no gill on ab seg. 1. I can't give you a sure ID without photos of the front of the head and the mouth parts.

Keep up the good work.

Earl

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Baetis (Blue-Winged Olive) Mayfly Nymph Pictures

Collection details
Location: Mystery Creek #62, New York
Date: April 1st, 2007
Added to site: April 3rd, 2007
Author: Troutnut
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