Header image
Enter a name
Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

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.

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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.

Caddisfly Family Thremmatidae

This caddisfly family is important in the fall. Neophylax may be important nationwide, but Oligophlebodes is only known to provide fishable action in the West.

Where & when

In 189 records from GBIF, adults of this family have mostly been collected during October (34%), September (23%), August (15%), July (12%), and June (9%).

In 136 records from GBIF, this family has been collected at elevations ranging from 30 to 11191 ft, with an average (median) of 1880 ft.

Family Range

Specimens of the Caddisfly Family Thremmatidae

1 Female Adult
3 Larvae

2 Underwater Pictures of Thremmatidae Caddisflies:


Start a Discussion of Thremmatidae

References

Caddisfly Family Thremmatidae

Taxonomy
Family Range
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy