Fine wire or holographic tinsel rib Silver flashabou (1 length)
Poly yarn or Antron (wing/gills) White poly yarn (small tuft)
Superfine dubbing (optional thorax) Black dubbing (tiny pinch)
How to tie it
Start the thread behind the eye and wrap a smooth, thin thread body back to the bend and forward again to the 70% mark, keeping it slim and slightly tapered.
Tie in fine silver wire or holographic tinsel at the rear and rib the body forward in 5-6 evenly spaced open turns to suggest segmentation; tie off and helicopter the excess.
Tie a very small tuft of white poly on top at the front as a short wing/gill bump, sparse, no longer than a hook eye.
Optional: dub a tiny black thorax bump in front of the wing to lock it upright.
Build a neat thread head, whip finish, and add a pinhead drop of head cement.