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.
This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
Zoogeographical: Zoogeographicals regions are large (continent-scale or larger) geographic regions within which animal communities are more similar and closely related than they are among different regions.
This other word references the same concept: zoogeographic.