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Specimen Discussion

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Teamrenna	June 12th, 2008, 12:19 pm
Posts: 2	Edit: Post removed
GONZO	June 12th, 2008, 7:25 pm
Site Editor "Bear Swamp," PA Posts: 1681	Teamrenna, Your comments confused me at first, until I realized that your perspective seems to be from a different part of the world. Neither Siphonoperla burmeisteri nor Xanthoperla apicalis is found in North America. (This specimen was collected from a small stream in New York, USA.) ...all Isoperla species are much bigger.... Perhaps that is true where you live, but some North American Isoperla are well within the size range indicated by the photo (+/-14mm from head to wingtips). As best I can sort it out, everything appears to be consistent with a perlodid ID. What structures do you see that suggest Chloroperlidae?
Teamrenna	September 4th, 2008, 1:00 pm
Posts: 2	My bad Gonzo. I concluded to fast. Its of course a female Isoperla. I must have been blind or something when i posted my first comment. Pay attention to the slight notch in this specimens subgenital plate (posterior, as seen in one of the pohots. What does your taxonomic keys say? In my region (Norway),adult isoperla (grammatica, obscura and difformis) females can be separated by this feature. This specimen has a difformis-like subgenital plate by the way.
GONZO	September 9th, 2008, 1:32 pm
Site Editor "Bear Swamp," PA Posts: 1681	My bad Gonzo. Not a problem, Teamrenna. I always enjoy hearing from fly fishers and aquatic insect enthusiasts from other parts of the world. (And I dream of visiting your stunningly beautiful country some day!) What does your taxonomic keys say? I wish it were that easy. Unfortunately, if a comprehensive species-level key to all stages/sexes of North American Isoperla exists, I'm not aware of it. Many of the existing keys are either out of date or lead to a statement that says that females must be associated with males for identification. Part of the problem is that we have nearly 60 North American species assigned to this genus, and some adults are described mostly by distinctions in male genitalia. There are about 19 Isoperla species in my home state of Pennsylvania, with a few unnamed as yet. In general appearance, this specimen looks much like Isoperla cotta. However, given the number of similar-looking species and the degree of variation among them, I still wouldn't hazard a guess about the species. Incomplete distribution records further compound our identification problems. For example, Isoperla cotta is not listed in the distribution records that I have seen for New York State, but I know that specimens identified and photographed by Dr. Whitney Cranshaw were collected there. Best, Lloyd (Gonzo)

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