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GONZO | May 19th, 2007, 4:01 pm | |
Site Editor "Bear Swamp," PAPosts: 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. | |
Title | Replies | Last Reply |
Re: proteus, biloba, and comstocki In Pteronarcys biloba Stonefly Nymph by Beardius | 1 | Oct 28, 2008 by GONZO |
Re: Some pics from a NC stream In the Identify This! Board by RyanBednar | 3 | Apr 26, 2010 by RyanBednar |
Re: Latin Redux In General Discussion by Martinlf | 10 | Feb 12, 2007 by CaseyP |
Re: little black stoneflies In the Stonefly Family Capniidae by CaseyP | 5 | Nov 29, 2012 by Entoman |
Re: Northern Ontario Canada, Stonefly question. In General Discussion by Snowsquatch | 4 | Sep 4, 2012 by Entoman |
Re: Fly Box Redesign In General Discussion by Wesjohns8 | 12 | Mar 12, 2019 by Jmd123 |
Correction In Pteronarcys proteus Stonefly Nymph by GONZO | 0 | |
Re: pternonarcys In Pteronarcys dorsata Stonefly Nymph by Flyfisher11 | 1 | Feb 26, 2022 by Wiflyfisher |
Re: Grayling fishing and bug collecting at Nome Creek In Site Updates by Troutnut | 65 | Jul 20, 2011 by Entoman |
Re: Pteronarcys californica nymph In the Photography Board by Millcreek | 2 | Jun 14, 2016 by Millcreek |