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.
...Jim (Slattery) was also responsible for creating the famous Stimulator, although he rarely receives credit for it.
Interesting.. There must be quite a back-story to this. I must admit that many knowledgeable anglers don't give much credit for this pattern to Mr. Kaufmann, anyway. It's a little hard to argue that hook substitutions and less dense hackle over head dubbing constitute a different pattern. It's nothing more than a variation of the Improved Sofa Pillow that preceded it by at least a decade, perhaps more.
Attributing fly authorship and material application technique is a tricky business. For example, the Bird's Nest mentioned in this thread is generally acknowledged as a very unique fly from the creative vise of Cal Bird. But is it? His hair collar in front of the hackle was used by Polly Rosborough years before (Fleidermouse, Casual Dress). Where did Polly get the idea? Where does Poul Jorgenson fit in the mix? Is there some European that has the technique in print that vastly pre-dates them all? Not that I discount the possibility that these great tiers developed their techniques independently from whole cloth. Heck, I've come up with stuff countless times over the years only to find out later that somebody else got there first.:) Nor are dates easy to ascribe for precedent as creation dates and ascent to popularity (or showing up in print) are unique to each situation and highly variable.
It's been said that we all stand on the shoulders that precede us and that very little is truly new under the sun. Regardless, it's the individual souls subtle and unique individual imprint put on their "creations" that makes them original in all the universe. Nothing has been exactly like them before or will be again. Close perhaps, but not the same. To me, this is a key attribute that makes it art...
"Nothing new under the sun." That's for sure! The Improved Sofa Pillow ended up the "Mattress Thrasher" along the Au Sable, which is a variation of the Stimulator etc...We just don't palmer a hackle through the abdomen so the fly 's body rests on the water. We leave out the tail as well. A great fly in different versions to rattle up Brown's when the stoneflies are about. http://www.danica.com/flytier/swilliams/swilliams.htm
The link takes you to Steve Willian's page on Hans' web site. Toggle down to Yellow-Bellied Mattress Thrasher. Steve Williams has been hanging around the Au Sable since the 70's sometime and this is his version. Change the size and color to match the natural and bam!
Creative minds often think alike. In art, many times, artists base their art on previous works.
I would think your fly resembles a midge pupae. It looks quite small.
I know why. I fished a small, shallow lake recently, and had fabulous fishing, and big rainbows virtually every cast for two hours! I could stand up, and see cruising fish in my driftboat, while the float tubers, and pontooners could not. I'd holler to them when fish would cruise their way. When I could not see fish when the breeze came up, I could shotgun cast 360 degrees very easily standing up in my boat.
How about the parachute style?