My experiment for a segmented thread body fell flat so to speak. The first layer, olive, was fine, but the over layer of black laid flat and obscured much of the green. I could twist the black thread and see if I get a finer black ribbing. Or an ultra fine wire ribbing that would provide a cleaner appearance.
SwittersB & Exploring 
As I noted to your other comment: the ‘tail’ of Zelon is the tail and the nymphal shuck.
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All fly shops will likely have Zelon or some antron product in as many as six colors. The dangling synthetic fibers represent a couple thing: the nymphal shuck or exoskeleton that the emerger/dun is attempting to exit and leave behind; and the tail.
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