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.

Stream photos

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Holocentropus Caddisfly Larva Holocentropus Caddisfly Larva

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.

11 Recently Added Photos

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.

Female Helopicus subvarians (Springfly) Stonefly Adult Pictures

I caught this female during her egg-laying flight.

Ruler view of a Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York The smallest ruler marks are 1 mm.

Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York

Lateral view of a Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York

Ventral view of a Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York

Dorsal view of a Female Helopicus subvarians (Perlodidae) (Springfly) Stonefly Adult from the West Branch of the Delaware River in New York

This stonefly was collected from the West Branch of the Delaware River in New York on June 7th, 2007 and added to Troutnut.com by Troutnut on June 8th, 2007.

Discussions of this Adult

Gorgeous photos!

13 replies

Posted by Jmd123 on Aug 26, 2009

Last reply on Jan 28, 2011 by Entoman

What a beautiful insect! You know, I feel sorry for all of those people who hate and fear six-legged creatures - they have no idea what wonders and treasures they are missing. Of course, my M.S. in entomology may bias my opinion...

Jonathon

Cool Perlid

3 replies

Posted by Troutnut on Jun 8, 2007

Last reply on Apr 7, 2010 by GONZO

The dark abdomen on this one is pretty striking. Does anyone know what species this is?

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