I decided to check out the upper Doyles River this morning -- up at Brown's Cove -- though I expected to find very little. Up there the river is small and clean, and in the winter and spring it hosts high quality insects. But would I find much of anything there in the summer? Well, surprise, I found a lot of small minnow mayflies. I've been "lookin' in all the wrong places."
1. In the photo at the top of the page, a beautiful male Acentrella nadineae. Beautiful pattern on the thorax/wing pads.
2. A smallish Baetis flavistriga, the first one I've seen so far this summer -- but I never see very many.
For species ID, we look at the marks on the terga: "two large submedian kidney shaped spots on abdominal terga." (Beaty, "The Ephemeroptera of North Carolina," p. 6) These. (Note that two of the cerci are missing.)
________________
3. Also at the upper Doyles site, a tiny Baetis intercalaris nymph.
If you look closely, you can see the parentheses marks on the terga -- () -- that distinguish this species. Also, there is banding on the cerci at both the base and the middle.
On my way back into town, I decided to stop at my lower Doyles site, just one mile shy of White Hall. I was hoping to find another Serratella spiny crawler. No luck with that, but I did find two additional small minnow species.
4. Acentrella turbida. Note the broad thorax vs. that of A. nadineae. (And the gills do not look the same.)
5. And then I found this male Plauditus dubius nymph.
But I also found this tiny, tiny nymph.
What on earth is that one you say? I sure didn't know until I got home and uploaded my photos. Then I noted the following features: 1) the tails are banded medially, and 2) there are median spots on tergites 2 and 6, and 3) tergites 5-7 are slightly darker than the rest.
That makes it a "female" Plauditus dubius!
________________
Off to the Rapidan River tomorrow where I'm bound to see lots of nice things -- though it's hard to beat this nymph for beauty.
No comments:
Post a Comment