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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
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.

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
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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