With today's magic foil and scud back materials providing the exoskeleton of insects and crustaceans, the Nyerges Shrimp imitation shows that none of today's materials are even required to make a good pattern.
Hook:: Mustad 9672 size 8-12 (or equivalent)
Body: Olive Chenille
Legs: Brown hackle
The hackle is wrapped over the body & then clipped off on the top & sides to suggest shrimp legs.
This fly was developed by Gil Nyerges. A very simple fly to tie and very good anywhere shrimp are present.
Reference: Popular Fly Patterns by Terry Hellekson