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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Heptagenioidea » Brushlegged Mayflies (Isonychiidae) » Isonychia
Photo#748420
Large brown imago mayfly - Isonychia
Copyright © 2013 Colin (Sandy) Pittendrigh

Large brown imago mayfly - Isonychia
Bozeman, Gallatin County, Montana, USA
May 1, 2008
Size: 5/8" long or 16mm
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Contributed by Colin (Sandy) Pittendrigh on 3 March, 2013 - 6:09pm
Last updated 4 March, 2013 - 2:40am

Thank you Roger. How do you
Thank you Roger.
How do you know it's female? With many (Baetis and Ephemerella Dorothea) the males have bulbous rusty red eyes, among other differences. Would the male Isonychia have larger redder eyes too?
… Colin (Sandy) Pittendrigh, 4 March, 2013 - 7:38am login or register to post comments

 
Mayfly imago sex differentiation
Mayfly imagoes can usually be differentiated by sex based on a combination of eye size/shape, presence/absence of claspers, foreleg length, and general body proportion. Male imagoes usually have larger eyes, claspers, longer forelegs, and a somewhat less stout body than their female counterparts.

In Isonychia, the male imago has a more a globular eye shape, than its female counterpart, which has a flatter (less-rounded) eye shape. Hope this satisfactorily answers your questions.
… Roger Rohrbeck, 4 March, 2013 - 10:28am login or register to post comments

Moved
Moved from Brushlegged Mayflies.
… Roger Rohrbeck, 4 March, 2013 - 2:40am login or register to post comments

Moved
Moved from Mayflies.
… Roger Rohrbeck, 4 March, 2013 - 2:39am login or register to post comments

Isonychia
Hi Sandy-

I believe this female imago to be of genus Isonychia.
… Roger Rohrbeck, 4 March, 2013 - 2:38am login or register to post comments

Moved for expert attention
Moved from ID Request.
… Ken Wolgemuth, 3 March, 2013 - 6:43pm login or register to post comments

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