Not a fly - BugGuide.Net

Another possibility: Isoperla transmarina (?)

I stumbled upon what I believe is Banks' original description of Isoperla ventralis, collected from Grand Lake, NF. The size is exactly the same (11mm) and the description also seems to fit this specimen well. Isoperla ventralis is a junior synonym of Isoperla transmarina. Just a thought.

PS--I just found some images identified as transmarina for comparison: 1, 2.

… Lloyd Gonzales, 22 July, 2008 - 11:11am

could be

I photographed an Isogen. hansoni adult (posted at DiscoverLife) this summer, and it is certainly not this species based on color pattern and larger size. Based on size an Isoperla is verrry likely. I transmarina larvae are reasonably frequent in some of the streams here, so perhaps Tom or I will get lucky one of these days.

… Donald S. Chandler, 4 November, 2009 - 9:26pm

Moved

Moved from Stoneflies.

… Mardon Erbland, 20 July, 2008 - 5:54am

Perlodidae: Isogenoides hansoni

Checked the description of I. hansoni in the recent revision of this genus, and it fits your specimen well (and is very similar by the description to D. nan*seni), plus this species is known from Newfoundland.

… Donald S. Chandler, 19 July, 2008 - 10:46pm

I wish...

that I could live up to v belov's expectation and say something "authoritative" about this one, but I can't even improve upon the guess that this might be a perlid. I checked collection records for NF/LB and found no joy there. You surely must have more Plecoptera than have been recorded! I saw only one perlid listed (for NF, none for LB), and I'm pretty sure that this isn't it. None of the listed perlodids or chloroperlids rang any bells either, but I'm not familiar with of all of them.

Even though your photos are excellent, they don't show the areas that would allow for more definitive sorting. The presence of shriveled gill remnants on the sides of the thorax is one of the easier ways to determine a perlid ID, and clear detail of the anal region of the wing (that area close to the "shoulder") would help as well. However, these areas are rarely shown in a useful way in most photos of adult stoneflies. Sorry I couldn't be of more help with this one. :(

… Lloyd Gonzales, 18 July, 2008 - 11:32pm

Thank you

I've added another image that I think shows one of the areas you mentioned as important. Is this of any use?

… Mardon Erbland, 19 July, 2008 - 4:34am

look among stoneflies

Perlidae?

… v belov, 9 July, 2008 - 2:46pm

Thanks

I went through all the stone flies and couldn't find one exactly like this one. I agree that the family Perlidae looks the closest but I wasn't confident enoguh to move the images there unless you think I should.

… Mardon Erbland, 9 July, 2008 - 8:24pm

i'd recommend

...for you to wait for a more authoritative opinion -- there are people around here (Donald S. Chandler, Lloyd Gonzales) who seem to be well-versed in aquatic insects and review relevant posts every now and then; let them handle this

… v belov, 9 July, 2008 - 8:54pm