Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
Discoidal cell: The discoidal cell (denoted dc) is a distinctive cell in caddisfly wings, formed by the forks of the radial sector being closed apically by the sectorial crossvein.
These other words reference the same concept: dc, cell dc, dc cell.