Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Discussion of 2018 gathering

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington

TaxonomyBrowseInfoImagesLinksBooksData
Photo#1450110
Big Mayfly - Isonychia

Big Mayfly - Isonychia
Carlotta/Van Duzen River, Humboldt County, County, California, USA
October 1, 2017
Size: 28 mm not counting tails
These are some of the largest mayflies I've ever seen. There were a great many exuviae on the rocks and shore in selected locations of the river.

Images of this individual: tag all
Big Mayfly - Isonychia Big Mayfly - Isonychia

Moved
Moved from Mayflies.

Isonychia velma
These are Isonychia velma nymphs and an adult.

Moved
Moved from ID Request.

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.