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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 Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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 Stenonema modestum (Cream Cahill) Mayfly Dun Pictures

Lateral view of a Male Stenonema modestum (Heptageniidae) (Cream Cahill) Mayfly Dun from the Teal River in Wisconsin
Male Stenonema modestum (Heptageniidae) (Cream Cahill) Mayfly Dun from the Teal River in Wisconsin
Dorsal view of a Male Stenonema modestum (Heptageniidae) (Cream Cahill) Mayfly Dun from the Teal River in Wisconsin
Ventral view of a Male Stenonema modestum (Heptageniidae) (Cream Cahill) Mayfly Dun from the Teal River in Wisconsin
Male Stenonema modestum (Heptageniidae) (Cream Cahill) Mayfly Dun from the Teal River in Wisconsin
Male Stenonema modestum (Heptageniidae) (Cream Cahill) Mayfly Dun from the Teal River in Wisconsin

This mayfly was collected from the Teal River in Wisconsin on June 4th, 2005 and added to Troutnut.com by Troutnut on May 24th, 2006.

Discussions of this Dun

Not Stenacron
2 replies
Posted by GONZO on Nov 26, 2006
Last reply on Dec 14, 2012 by Brookyman
Hi Jason-

While scanning the Stenacron specimens in response to Jeff's question, I came across this one. It does not appear to be Stenacron. It lacks the dark pigmentation (spot) between R1 and R2 that is distinctive of this genus. Clearly, it is a member of the Heptageniidae, but I haven't found a definitive clue to indicate which one it might be. Perhaps someone else will detect something more conclusive.

Start a Discussion of Dun

Male Stenonema modestum (Cream Cahill) Mayfly Dun Pictures

Collection details
Location: Teal River, Wisconsin
Date: June 4th, 2005
Added to site: May 24th, 2006
Author: Troutnut
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