The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
Fish weren't taking anything. Well, except for a little inchworm pattern that's kept me from a skunking many times
No, there are no aquatic millipeds in N America or anywhere else in the world. This is because they lack a structure, a gill, to extract oxygen from water; their respiratory system is specially adapted for extracting oxygen from air, just like ours as humans is. However, there are many millipeds, like Oxidus gracilis in your photos, that can SURVIVE under water for surprising lengths of time, and I’m not sure why but perhaps it is because an air bubble gets trapped around their spiracles, as in some diving beetles. Once the oxygen in that air bubble is depleted, however, the milliped/beetle must replenish it with more air or drown.
Hope this is helpful.
Rowland M. Shelley, Ph. D.
Curator of Terrestrial Invertebrates
North Carolina State Museum of Natural Sciences
Kurt, I don't think the inchworm was imitating the millipedes...
No, there are no aquatic millipeds in N America or anywhere else in the world.