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

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

Mayfly on water tank - Siphlonurus

Mayfly on water tank - Siphlonurus
6 miles NW Lyons, Boulder County, Colorado, USA
April 30, 2007
Size: BL ~16 mm
This mayfly was photographed here in the foothills at about 6400' at the end of April. It was resting on a large water tank several hundred feet uphill from a small creek. Wing venation is very different from Baetidae. Any help with its ID is greatly appreciated.

Moved from Siphloplecton.

Hi Lynn-

Being somewhat uneasy with my initial placement, partly due to the unlikelihood of finding Siphloplecton in Colorado, I consulted Dr. Luke M. Jacobus (Mayfly Central, Steward) concerning the placement.

After reviewing his short list of possibilities, which included my initial placement, I have spent considerable additional time studying your photo, and have now come to believe this male imago to be of genus Siphlonurus, several species of which are found in Colorado.

Thank you so much for the extra effort in trying to ID this mayfly. I do appreciate it. This one is special since it is one of only two adult mayflies we have found on our property.

You are entirely welcome. However, the genus name is Siphlonurus.

Whoops! I've changed my spel
Whoops! I've changed my spelling.

Moved from Mayflies.

Hi Lynn-

I believe this mayfly male imago to be of genus Siphloplecton, which to the best of my knowledge has not previously been reported to reside in Colorado. Its closest states of (previously) reported residency are Iowa and Illinois. Really quite amazing!

Thanks so much for this ID. The Siphloplecton is amazing! Sounds like it may be a stray. We've have a couple of stray butterflies here, but they came from the south, not the east.

Not strays
Unlike butterflies, mayflies are in their winged life forms for only a few days, and spend most of that time in the shade of streamside vegetation, as they are unable to either drink or eat, so they don't really have time to stray.

Not strays
I knew they were short-lived, but I didn't know they did not eat nor drink. I'm looking forward to learning much more about this order.

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