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.
Entoman on Feb 21, 2014February 21st, 2014, 9:11 pm EST
That helps Mack. Those were most likely pupae in their early development and thus retained a lot of larval color. By the time they emerge they have largely (usually) taken on the color of the adults, though in some cases more vibrant. The word pupa is often erroneously used by us anglers to describe what are technically pharate adults (pharates that have eclosed from the pupal cuticle and exited their shelters). This is why there is so much confusion about color. A species seined from the drift in the process of emergence can look quite different in color from its brothers pried from a rock earlier in the cycle.
Though I can't think of an orange pharate adult or "emergent pupa" in that size range (they are usually either very tiny or very large), there are several possibilities for it in early development. The saddle-case makers of the Glossosomatidae, smaller tube case making Limnephiloidea like the Apataniidae smoky sedges and even the philopotamid finger-net caddis like the Chimarra example above could possibly be orange hued as larvae and early stage pupae. Coloration can vary quite a bit depending on habitat and strain and samples are thin. Try to get some pictures this Summer.
I'm trying, Roger...;)
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Entoman on Feb 22, 2014February 22nd, 2014, 10:14 pm EST
Yes, I got that.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Entoman on Feb 24, 2014February 24th, 2014, 5:11 pm EST
The lack of larval cases excludes all but the philopotomids, at least from my list of possibilities. Perhaps they are the less common Dolophilodes (Winter Caddis). That would explain the relative lack of Pupae during your early Summer sampling. They do emerge a little in the Summer, but are mostly Fall/Winter emergers. Another possibility is Wormaldia (Little Fall Stream Caddis). Though even less common, they are more likely to be found in the smaller upland streams you frequent than the other two. What has me wondering more than the color you are reporting is their size. A size 16 is outsized for these genera according to most reports. Without a look at the critter, discussions of what it may or may not be is pretty speculative.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman