Troutnut.com Fly Fishing for Trout Home
User Password
or register.
Scientific name search:

> > Help with Pteronarcys species characters?

The Specimen

The Discussion

GONZOMay 19th, 2007, 4:01 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
Jason,

When I first looked at this specimen, my first instinct was to guess that it was biloba, especially coming from the upper Neversink. But, the more I compare it to the specimen I previously guessed as biloba, the more I see subtle differences. The pronotum is a different shape and the knobs or spines extend further along the abdomen. Perhaps these are variable traits or gender differences, but I'm starting to wonder about both IDs.

Of the Eastern (or transcontinental) species, I'm pretty familiar with dorsata and biloba, and I've seen a few specimens that I'm pretty sure are comstocki. These latter specimens had fearsome-looking long spines along the abdomen and I guessed at the comstocki ID mostly because its nickname is the "spiny salmonfly."

I've seen cladistic diagrams that indicate that scotti is considered to be the closest relative of biloba, but it seems to have a more southerly distribution. (That diagram also seemed to explain why Allonarcys is no longer favored as a separate genus for the Pteronarcys species with spines or knobs.)

I'm not aware of the species descriptions of proteus or pictetii. Until I saw a survey of the Delaware River basin, I assumed that the large unknobbed Pteronarcys that I had seen on the main branch were dorsata (and that's what Ernie S. said they were), but the survey lists only biloba, comstocki, and proteus.

Could someone provide some characters for these other species? It would help to resolve my current confusion and would be greatly appreciated.

Quick Reply

You have to be logged in to post on the forum. It's this easy:
Username:          Email:

Password:    Confirm Password:

I am at least 13 years old and agree to the rules.

Related Discussions

TitleRepliesLast Reply
Re: proteus, biloba, and comstocki
In Pteronarcys biloba Stonefly Nymph by Beardius
1Oct 28, 2008
by GONZO
Re: Some pics from a NC stream
In the Identify This! Board by RyanBednar
3Apr 26, 2010
by RyanBednar
Re: Latin Redux
In General Discussion by Martinlf
10Feb 12, 2007
by CaseyP
Re: little black stoneflies
In the Stonefly Family Capniidae by CaseyP
5Nov 29, 2012
by Entoman
Re: Northern Ontario Canada, Stonefly question.
In General Discussion by Snowsquatch
4Sep 4, 2012
by Entoman
Re: My setae style chart,Kurt ,Luke.
In the Identify This! Board by Brookyman
4Dec 18, 2012
by Brookyman
Correction
In Pteronarcys proteus Stonefly Nymph by GONZO
0
Re: Pteronarcys californica nymph
In the Photography Board by Millcreek
2Jun 14, 2016
by Millcreek
Re: Grayling fishing and bug collecting at Nome Creek
In Site Updates by Troutnut
65Jul 20, 2011
by Entoman
Re: Novice Entomologist here
In the Identify This! Board by 754cromero
10Feb 8, 2013
by Taxon
Most Recent Posts
Re: Little Black Stonefly pics
In the Stonefly Species Allocapnia granulata by Adirman (Martinlf replied)
Re: Gear restricted streams.
In General Discussion by Partsman (Iasgair replied)
Re: Long-time reader, never-time poster? Start here!
In General Discussion by Troutnut (Martinlf replied)
Re: Spence - where art thou?
In General Discussion by Wbranch (Martinlf replied)
Re: Fishing Rod Suggestions
In Gear Talk by Princemoga (Wbranch replied)
Re: Stonefly ID help
In the Identify This! Board by Redfisher85
Re: Anyone know anything about this reel? No badging on it
In Gear Talk by Larry4duke (Partsman replied)
Re: Farmington Delivers me my first 2018 Dry Fly Trout
In Fishing Reports by Idryfly (Martinlf replied)
Re: Air lock thingamabobbers
In Gear Talk by Adirman (Wygnar replied)
Re: Emerger pictures anyone???
In the Caddisfly Genus Chimarra by Hellgie (Gazzer replied)