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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

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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Male Tallaperla maria (Common Roachfly) Stonefly Adult Pictures

The adult stoneflies of this family look surprisingly normal given the strange shape of the nymphs. I tried to identify it beyond family level 15 years after collecting it, based on my photos, which are not ideal. It's difficult even to tell the gender for sure because I don't have a good picture of the terminalia, but the body size suggests it's a male, and the species ranges suggest either Peltoperla arcuata or a male Tallaperla maria. One distinctive feature of the original description of this species is that the antennae are paler for a short distance beyond the first two thick, dark segments. That can be seen on this specimen and on a specimen on BugGuide identified as Tallaperla maria.

Body length (red) 8 mm, forewing length (blue) 10.5 mm

Ruler view of a Male Tallaperla maria (Peltoperlidae) (Roachfly) Stonefly Adult from Mystery Creek #42 in Pennsylvania The smallest ruler marks are 1 mm.
Lateral view of a Male Tallaperla maria (Peltoperlidae) (Roachfly) Stonefly Adult from Mystery Creek #42 in Pennsylvania
Dorsal view of a Male Tallaperla maria (Peltoperlidae) (Roachfly) Stonefly Adult from Mystery Creek #42 in Pennsylvania
Male Tallaperla maria (Peltoperlidae) (Roachfly) Stonefly Adult from Mystery Creek #42 in Pennsylvania
Ventral view of a Male Tallaperla maria (Peltoperlidae) (Roachfly) Stonefly Adult from Mystery Creek #42 in Pennsylvania
Male Tallaperla maria (Peltoperlidae) (Roachfly) Stonefly Adult from Mystery Creek #42 in Pennsylvania

This stonefly was collected from Mystery Creek #42 in Pennsylvania on May 28th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.


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Male Tallaperla maria (Common Roachfly) Stonefly Adult Pictures

Collection details
Location: Mystery Creek #42, Pennsylvania
Date: May 28th, 2007
Added to site: June 4th, 2007
Author: Troutnut
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