Header image
Enter a name
Blue-winged Olives

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.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Nyctiophylax affinis (Dinky Light Summer Sedge) Caddisfly Adult Pictures

This specimen is certainly Nyctiophylax and most likely Nyctiophylax affinis. I don't know my caddisfly parts well enough to definitively follow the Nyctiophylax key in Morse (1972), but that source states that affinis is the predominant Midwestern species, being widespread and common in the region where I found this one. The anatomy of this one seems to match those at least as well as the other two potential options based on range, Nyctiophylax uncus and Nyctiophylax banksi.

This caddisfly was collected from the Teal River in Wisconsin on June 8th, 2021 and added to Troutnut.com by Troutnut on June 9th, 2021.

Start a Discussion of Adult


  • Morse, JC. 1972. The genus Nyctiophylax in North America. Journal of the Kansas Entomological Society 42(2): 172-181.

Nyctiophylax affinis (Dinky Light Summer Sedge) Caddisfly Adult Pictures

Collection details
Location: Teal River, Wisconsin
Date: June 8th, 2021
Added to site: June 9th, 2021
Author: Troutnut
Troutnut.com is copyright © 2004-2023 (email Jason). privacy policy