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.

The North Fork Couer d'Alene River in Idaho

Stream photos

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Amphizoa Beetle Larva Amphizoa Beetle Larva

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington

This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).

5 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.

Perhaps Platycentropus

Lepidostoma (Little Brown Sedge) Caddisfly Larva

10 Pictures

Case view of a Lepidostoma (Lepidostomatidae) (Little Brown Sedge) Caddisfly Larva from Mongaup Creek in New York

This one got a little bit damaged in the abdomen when I extracted it from its case. That's a delicate job.

Collected May 5, 2007 from Mongaup Creek in New York

Added by Troutnut on May 18, 2007

Collected May 5, 2007 from Mongaup Creek in New York and added by Troutnut on May 18, 2007

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on May 18, 2007May 18th, 2007, 10:04 am EDT

Based on the case, I would think Platycentropus. Can you see if it has prosternal horns extending beyond the head capsule to mentum of labium? See Merrit p. 375 Figure 18.191.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on May 18, 2007May 18th, 2007, 11:25 am EDT

It doesn't. The prosternal horns only reach to the back of the head. It took about 10 minutes screwing around under a microscope to even see the prosternal horns (the whole thing is about half a centimeter long and the legs really wanted to be in the way). But I finally got a good view, and they are short, so that rules ot Platycentropus. The case seemed like a good match, though.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist