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 Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
Brachycentrus is one of the most important caddisfly genera in America. Microsema is smaller and rarely, if ever, significant. Amiocentrus aspilus can be an important Western hatch.
Taxon on Oct 30, 2009October 30th, 2009, 4:24 am EDT
Ken-
That would indeed be nice, but I don't believe one exists. In my experience, genus names of caddisflies (as opposed to mayflies) are rarely used in spoken discussion among fly fishers, probably for that very reason. Incidentally, the only source (of which I'm aware) for the phonetic pronunciation of Ephemerella suggests it to be ef-fem-er-ella.