Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Spiny Crawler Mayfly - Ephemerella dorothea - male

Spiny Crawler Mayfly - Ephemerella dorothea - Male
Pack Forest (near Eatonville), Pierce County, Washington, USA
July 10, 2009
See other images from the 2009 BugGuide Gathering here: gathering_2009

Moved from Mayflies.


Thanks for the background cloth weave comparison and additional specimen photos. Based on the weave, I was able to very roughly estimate the body length at ~8 mm. Based on the high resolution photos, which allowed much better examination of the wing venation and the genitalia, I believe this male imago to be Ephemerella, probably E. dorothea infrequens.

Other photos? Body length?
Hmm. Well, it's definitely a male imago. Do you have any other (or higher resolution) photos of it? Would also help to have an estimate of body length based on the weave dimensions of your background cloth plus a bit of geometry.