The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
Tibial spur: One of a small number of spurs (long, thick spikes) sticking out from the tibia distinctly further than the more numerous, smaller spikes or setae. The number of tibial spurs is often used an identifying characteristic for adult caddisflies, expressed as a list such as 1, 2, 2 denoting the number of spurs on the tibiae of the foreleg, middle leg, and hind leg, respectively.
This other word references the same concept: tibial spurs.
