Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
That would be Chimarra, most likely C. aterrima, but it could also be either C. obscura or C. socia. Based on that neat black egg mass visible in the ventral view photo, it would also appear that it's a female.
Although I have no handy key, there are good emergences of Chimarra in most of the medium-to-large Pocono streams in May. It is routine to see them clinging to the underside of low-hanging branches or woody debris along the streams.
Creno on Dec 22, 2007December 22nd, 2007, 9:07 am EST
Folks - This one is indeed a difficult one. I would not conclude Micrasema because the photo shows too many spurs. And I would not conclude Philopotamid because of several characters, including the egg mass Litobrancha noted. How about Theliopsyche, a rarely collected Lepidostomatid? At least Theliopsyche has the furry spurs located as in the photos and a long basal antennal segment.
Creno on Dec 31, 2007December 31st, 2007, 2:43 am EST
Folks - while I still think this is probably Theliopsyche, there was a brief mention of egg masses in this topic. I just ran into a nice specimen of Apatania incerta with the round egg mass still attached. I was going to attach a photo but couldn't figure out how to do it.
Are there instructions/procedures for attaching critter photos or is it not allowed?
Taxon on Dec 31, 2007December 31st, 2007, 4:37 am EST
The (unassisted) manner of posting a photo is inserting the following markup language, except use braces rather than curly braces:
Of course, this requires that the photo already be hosted on a server.
Alternatively, if one emails photos to Jason, he will host them on this server, and create a posting for you including the accompanying email verbiage. However, since starting grad school, his response would probably be somewhat slower.
Taxon on Dec 31, 2007December 31st, 2007, 9:25 am EST
Folks - while I still think this is probably Theliopsyche, there was a brief mention of egg masses in this topic. I just ran into a nice specimen of Apatania incerta with the round egg mass still attached.