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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As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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Little Brown Sedges
Like most common names,"Little Brown Sedge" can refer to more than one taxon. They're previewed below, along with 2 specimens. For more detail click through to the scientific names.
Caddisfly Family Lepidostomatidae
These are pretty much always called Little Brown Sedges.
See Lepidostoma for details. It's the only important genus in this family.
The other one, Theliopsyche, is an uncommon Eastern small stream genus.
The other one, Theliopsyche, is an uncommon Eastern small stream genus.
These specimens are still alive, just very cold, so the colors are accurate. I put them in the freezer for a bit to settle them down and overdid it a little:)
The photo of the specimen cased is alive. The photo of the uncased larva is the same specimen taken after it was preserved in its case. Unfortunately, there was a lot of pigment transfer making the specimen look olivaceous. In life it was grayish white as shown in the first photo.
See 8 more specimens...
Caddisfly Species Lepidostoma podagrum
These are pretty much always called Little Brown Sedges.
This species can be distinguished from other Lepidostoma by its swollen & scaly foretibiae. This is an important species in some western locales and often precipitates excellent angling opportunities. See the Lepidostoma genus hatch page for information on habitat and life history.
These specimens are still alive, just very cold, so the colors are accurate. I put them in the freezer for a bit to settle them down and overdid it a little:)
The photo of the specimen cased is alive. The photo of the uncased larva is the same specimen taken after it was preserved in its case. Unfortunately, there was a lot of pigment transfer making the specimen look olivaceous. In life it was grayish white as shown in the first photo.
See 2 more specimens...
Caddisfly Species Lepidostoma pluviale
These are often called Little Brown Sedges.
This is the most important Western species of Lepidostoma, and it can be very important to fly anglers.