Diverse shapes and sizes, but usually robust, sometimes flattened, often with tubercles or spines; always with 3 tails; wholly dorsal gills (never on Ab2) which slightly overlap and undute sequentially.
3 tails; pronounced angle on fore margin of hind wings; short unattached intercalary veins on outer margin of FW.
Tarsal claws w/denticles; gills start on abdominal segment 4, all similar in size; gills on ab. seg. 4 not (or partially) covering succeeding pairs, paired dorsal tubercles present on ab. segs.; all femora similar; all tails similar.
Body medium olive; wings medium gray; length: 6 mm.; 3 tails; emergences Aug 1 - Sep 10.
State of Washington distribution is based on: Mayflies (Ephemeroptera) of the far western United States (Part I: Washington)
by M. D. Meyer & W. P. McCafferty,
and augmented by A DNA Barcode Library for North American Ephemeroptera: etc. by Webb, Jacobus, Funk, et. al.
Created: 08/16/2013 Last modified: 12/07/2014