This is the possum nymph I tie, a guide in New Zealand showed one to me years ago, and I have been using them since then, they work great for me, they may have a name, but he just called it a possum nymph, he told me that was all a possum was good for. I use a tungsten head 1/8" on a #10 nymph hook, the tail is made of possum guard hairs, the body is the soft underfur, I usually rib it with copper wire, and the collar is just more guard hairs, I put them in a dubbing loop, twist and palmer them just behind the bead, I sometimes put 5 or 6 turns of .020 lead wire just behind the bead, some of those holes are small but the current is pretty quick.
http://s171.photobucket.com/albums/u294/ti...rent=possum.jpg