I have to correct my mistakes when I find them. This little Perlodid stonefly that I found in the Moormans on the 12/30/11 was not a Diploperla Perlodid -- as I so boldly proclaimed without doing any microscope study -- it was a Remenus Perlodid. Another first for the season.
Remenus is a Perlodid genus that I found in only two places last year: first at Buck Mt. Creek on 5/31, and then the very next day, 6/1, in a tributary to the Moormans. So, here's what they look like when they grow up.
5/31, Buck Mt. Creek:
6/1, tributary to the Moormans:
If you go back to the entry I posted on 5/31, you'll see that the key feature that distinguishes the genus Remenus from other Perlodid genera is the lacinia: it has only one tooth -- no other spines or hairs. And here's what I saw in microscope today when I took a close look at this nymph.
(I thought at first I had broken a second tooth off -- but no: the other lacinia was exactly the same.)
Perlodid stonefly, genus Remenus. And, the only species that is known for sure in North Carolina is Remenus bilobatus, TV = 0.9 (NCDWQ).
Sloppy work on my part. Sure looked like Diploperla, but clearly, we can't base ID on our "hunches". That also means, that I do not know the genus of the other Perlodid I found -- the one that had just recently molted and was almost transparent.