Optionally wrap 8-10 turns of lead-free wire over the front half of the shank for weight, then start olive thread. Tie in a short stub of olive marabou at the bend as a tail.
Tie in the rib, then dub a fat, robust abdomen over the rear two-thirds. Dragonfly nymphs have a broad, stout body, so build it fuller and slightly flattened compared with a mayfly nymph.
Counter-wrap the rib forward in 5-6 evenly spaced turns to segment the abdomen, and tie off.
Tie in a mottled turkey (or Thin Skin) wing case at the front of the abdomen, pointing back. If using eyes, tie a small pair of mono/dumbbell eyes at the head to suggest the nymph's prominent eyes.
Dub a wide, buggy thorax; add 2-3 legs of partridge or rubber to each side to represent the nymph's powerful sprawling legs.
Pull the wing case over the thorax, tie it down behind the eye, whip finish and cement. Pick out the thorax dubbing so it looks alive.