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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.
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Neophylax (Autumn Mottled Sedge) Caddisfly Larva Pictures

See the forum comments for notes on the identification of this specimen.

Case view of a Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York
Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York
Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York
Lateral view of a Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York
Dorsal view of a Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York
Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York
Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York
Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York
Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York
Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York
Ruler view of a Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York The smallest ruler marks are 1 mm.
Neophylax (Thremmatidae) (Autumn Mottled Sedge) Caddisfly Larva from Cayuta Creek in New York

This caddisfly was collected from Cayuta Creek in New York on April 14th, 2007 and added to Troutnut.com by Troutnut on April 22nd, 2007.

Discussions of this Larva

Glossosomatidae
1 replies
Posted by DMM on Apr 22, 2007
Last reply on Apr 23, 2007 by DMM
This is a uenoid. I know the genus, but I can't think of it now...sorry, I'll try to remember to look it up if no one else knows it.

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References

Neophylax (Autumn Mottled Sedge) Caddisfly Larva Pictures

Collection details
Location: Cayuta Creek, New York
Date: April 14th, 2007
Added to site: April 22nd, 2007
Author: Troutnut
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