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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.

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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.

Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on Jul 22, 2006July 22nd, 2006, 6:13 am EDT
It's fairly common knowledge that many Baetis mayflies crawl underwater to lay their eggs. What's strange is that most authors don't seem very surprised by this. As best I can tell from all my recent reading and note-taking, Baetis is the only genus of mayflies which displays this behavior. That seems remarkable.

Does anybody know of any other mayflies that do this? Have I missed something?
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Jul 22, 2006July 22nd, 2006, 10:00 am EDT
Jason-

As far as I know, Baetis is the only mayfly genus reported to display that oviposition behavior.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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