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.

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Holocentropus Caddisfly Larva Holocentropus Caddisfly Larva

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington

This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.

11 Recently Added Photos

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.

Hesperophylax (Silver Striped Sedge) Caddisfly Larva Pictures

Based on both range maps and key characteristics, this larva is either Hesperophylax designatus, Hesperophylax alaskensis, or Hesperophylax occidentalis. However, the species key in Parker & Wiggins (1985) cannot separate these species as larvae.

Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington

Case view of a Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington

Ruler view of a Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.

Dorsal view of a Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington

Ventral view of a Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington

This caddisfly was collected from the South Fork Snoqualmie River in Washington on June 13th, 2019 and added to Troutnut.com by Troutnut on June 15th, 2019.

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References

Parker, C. R., Wiggins, G. B. 1985. The Nearctic Caddisfly Genus Hesperophylax Banks (trichoptera: Limnephilidae). Canadian Journal of Zoology 63(10): 2443-2472.