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.
Anastomosed: Anastomosed wing veins branch out and rejoin, often creating the appearance of irregular subdivisions in contrast to the commonly expected regular pattern of veins.
These other words reference the same concept: anastomoses, anastomose, anastomosing.