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.

Stream photos

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Setvena wahkeena (Wahkeena Springfly) Stonefly Nymph Setvena wahkeena (Wahkeena Springfly) Stonefly Nymph

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.

7 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.

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Stonefly Species Haploperla brevis (Sallflies)

Where & when

In 72 records from GBIF, adults of this species have mostly been collected during May (35%), June (33%), July (13%), April (10%), and August (7%).

In 18 records from GBIF, this species has been collected at elevations ranging from 49 to 4663 ft, with an average (median) of 2342 ft.

Species Range

source

Map of specific collection sites

Physical description

Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.

Adult

Described in Banks (1895) as Choraperla brevis

6 mm. Greenish yellow. Head a little broader than thorax, antenna with basal third yellowish beyond black. Prothorax with a fuscous stripe on each side margin, once and one-half as long as broad, barely broader in front, angles rounded, scarcely rugose; tarsi slightly fuscous. Wings nearly hyaline, with greenish veins, crossveins at end of discal cells disjointed, the upper fork of radial sector is not as long as the pedicel beyond these crossveins (in one specimen it is just as long), three crossveins between vein Cu₁ and vein Cu₂.

Start a Discussion of Haploperla brevis

References

Banks, N. 1895. New Neuropteroid Insects. Transactions of the American Entomological Society 22(3): 313-316.