Ephoron Leukon? - Ephoron leukon

Moved

Moved from Mayflies.

… Roger Rohrbeck, 18 January, 2016 - 8:09pm

Ephoron album vs. Ephoron leukon

These species (in their nymphal lifestage) can be differentiated based on both the number of spines on their tusks, and whether or not their gills have trachea. Mayflies (The Angler And The Trout) by Fred L. Arbona Jr. indicates that Ephoron album have have 15-25 spines on each tusk, and to not have trachea in their gills, whereas Ephoron leukon have 28-39 spines on each tusk, and do have trachea in their gills.

Unfortunately, I do not feel qualified to make a species determination for you, but will observe that, although Ephoron album yet to be reported from MN, its species distribution is trans-continental, so it is reasonably likely to reside there as well. Hope this helps.

… Roger Rohrbeck, 18 January, 2016 - 12:16am

Gill Trachea

I uploaded an image of the gills. If, you would like to see them.

Thanks for the info :)

… Lane Baguss, 18 January, 2016 - 3:48pm

Gill trachea

Hi Lane-

Thanks for uploading the photo showing a blowup of the gills. The purple streaks on the gills are the treachea, so it appears that this nymph is Ephoron leukon as you originally suggested.

… Roger Rohrbeck, 18 January, 2016 - 8:06pm

Moved

Moved from ID Request.

… Ken Wolgemuth, 17 January, 2016 - 9:16pm