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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

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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
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.
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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Caddisfly Genus Ceratopsyche (Spotted Sedges)

This genus has been proposed off and on for years. For reasons beyond the scope of this hatch page to explain, it briefly had most of the important species of the most important genus Hydropsyche in its fold. They have all been moved back and the name Ceratopsyche is no longer valid.

Where & when

In 674 records from GBIF, adults of this genus have mostly been collected during June (30%), July (21%), August (17%), May (16%), and September (7%).

In 385 records from GBIF, this genus has been collected at elevations ranging from 3 to 10007 ft, with an average (median) of 1781 ft.

Discussions of Ceratopsyche

What flies to imitate
12 replies
Posted by Goose on Sep 19, 2006
Last reply on Mar 21, 2010 by Martinlf
Jason: What species', in common angler language, are represented in this genus? I'm trying to determine which ones I should spend my time on imitating them. Are they October Caddis, Grannom Caddis, etc. Are those afore mentioned sedges? I would like to know the names so I can tie them the correct size and colors. Just trying to learn. Thanks

Start a Discussion of Ceratopsyche


Caddisfly Genus Ceratopsyche (Spotted Sedges)

Species in Ceratopsyche
Ceratopsyche morosa
Species in Ceratopsyche: Ceratopsyche morosa
22 species (Ceratopsyche aenigma, Ceratopsyche alhedra, Ceratopsyche amblis, Ceratopsyche andersoni, Ceratopsyche centra, Ceratopsyche cheilonis, Ceratopsyche cora, Ceratopsyche dorata, Ceratopsyche etnieri, Ceratopsyche intrica, Ceratopsyche macleodi, Ceratopsyche oslari, Ceratopsyche piatrix, Ceratopsyche protis, Ceratopsyche slossonae, Ceratopsyche sparna, Ceratopsyche tana, Ceratopsyche vanaca, Ceratopsyche venada, Ceratopsyche ventura, Ceratopsyche vexa, and Ceratopsyche walkeri) aren't included.
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