Seining in a spring creek not too far from home on Sunday I found abundant caddis larva, descriptions of which do not appear in LaFontaine's book or in the Orvis Caddisfly handbook, as far as I can tell. I also checked the Aquatic Insects section on this forum, but didn't come across anything like them. They appear to be free living, and the general body shape, segmented, plump, and tapered at both ends, was much like Rhyacophilidae, but the bugs I found lack any plates behind the tiny head, which is light brown and comes to point, much like the end of a sharp toothpick. There is a dark V at the tip of the point, with the widest part at the tip, looking somewhat like it might be the outline of jaws, but I lack sufficient magnification in any of my instruments to really tell. The one I brought home was 15 mm, but there were larger and smaller specimens. The dorsal side was two tone, each segment cream on the front and very dark grey on the back, giving the dorsal side a distinct dark and light banding. The ventral side was cream. It had what appear to be two hooks at the tail. It did have six legs up front, so it appears to be a caddis, not some other bug--unless some beetles have aquatic larvae that look like this, I suppose.
Does anyone have any ideas about what this might be, and more importantly, might it be a good thing to imitate for a searching pattern in this stream, or is this bug generally unavailable for trout?
I am thinking alternating bands of black and white micro chenille, or perhaps embroidery floss, might work in an imitation, Or I might try cutting a Tyvek overbody, coloring it, and binding it to a white chenille underbody with a spiral of white thread to create segments and realistic looking dorsal and ventral surfaces--but if someone knows this bug and has a pattern, I'd be most interested.
"He spread them a yard and a half. 'And every one that got away is this big.'"