WA Mayfly Descriptions

Map

Flyfishing Entomology

WA Mayfly Description

Taxonomic Name (Common Name)	Larva (Nymph)	Subimago (Dun) Imago (Spinner)
Caenidae (Small Squaregilled Mayfly )	Head and pronota narrower than mesonota; no gills on abdominal segment one; gills on second segment large and square, visibly separate, and cover the other gills; hind wing pads usually absent; 3 tails.	Robust thorax; small abdomen; 3 tails; no hind wings.

Taxonomic Name
(Common Name)

Larva (Nymph)

Subimago (Dun)
Imago (Spinner)

Caenis
(Angler's Curse; Little White Mayfly; Little White Spinner. )

larva (nymph)

imago (spinner) - female

Caenis

Body dark brown; head w/o prominent bumps; no hind wing pads; large square gills attached to back of 2nd abdominal segment; forelegs same length as others.

Thorax brown.

Caenis amica

Caenis latipennis

Caenis youngi

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 www.FlyfishingEntomology.com