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The Specimen

Ecdyonurus criddlei (Little Slate-Winged Dun) Mayfly NymphEcdyonurus criddlei (Little Slate-Winged Dun) Mayfly Nymph View 1 PicturesThis is an interesting Heptageniid mayfly since in western Montana it is only found in cold lakes, especially those in Glacier National Park.
Collected July 31, 2007 from Kintla Lake in Montana
Added to Troutnut.com by on June 26, 2011

The Discussion

Jmw975December 11th, 2012, 8:47 am
Guelph, Ontario

Posts: 20
Hi all,
These specimens are in great shape!

the lower nymph in this photo is definitely not E. criddlei, but E. simplicoides. E. simplicioides has that distinctive color pattern with the pair of rectangular pale markings on tergum 4 and no median markings on the other terga.

The upper specimen is probably E. criddlei, but seems to have more extensive pale markings than specimens from further west.

cheers,
Jeff

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