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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Combmouthed Minnow Mayflies (Ameletidae) » Ameletus
Photo#900747
Mayfly - Ameletus
Copyright © 2014 Pat Cassidy

Mayfly - Ameletus
Pilot Rock, Umatilla County, Oregon, USA
March 14, 2014
Size: 15mm body

Images of this individual: tag all
Mayfly - Ameletus Mayfly - Ameletus Mayfly - Ameletus
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Contributed by Pat Cassidy on 14 March, 2014 - 11:37am
Last updated 15 March, 2014 - 1:04pm

Moved
Moved from Rhithrogena.
… Roger Rohrbeck, 15 March, 2014 - 1:04pm login or register to post comments

Moved
Moved from Mayflies.
… Roger Rohrbeck, 15 March, 2014 - 2:10am login or register to post comments

Rhithrogena
Hi Pat-

I believe this male subimago to be of genus Rhithrogena.
… Roger Rohrbeck, 15 March, 2014 - 2:08am login or register to post comments

 
Thanks Roger
Could this be a March Brown Mayfly (Rhithrogena Morrisoni)? The March Brown mayfly is the first large mayfly hatch of the year according to some sport fishing sites.
… Pat Cassidy, 15 March, 2014 - 7:37am login or register to post comments

 
OR Rhithrogena species
Pat-

Six Rhithrogena species are known from Oregon, two of which are known from Umatilla County, those being R. morrisoni and R. undulata. However, that certainly doesn't guarantee that your mayfly is even one of those two species.

Incidentally, none of the six would be expected to approach the body length of 15 mm, which you reported. A maximum body length of 7 - 10 mm (as measured from the front of the head to the end of the abdomen, not including the length of the tails) would to be more likely.
… Roger Rohrbeck, 15 March, 2014 - 9:04am login or register to post comments

 
Just to be sure
I measured the length just as you stated, so the search continues.
I still have the Mayfly and just measured it again.
Thanks.
… Pat Cassidy, 15 March, 2014 - 9:13am login or register to post comments

 
Ameletus
Pat-

Oops, I should have dug a bit deeper. It's actually a male subimago of genus Ameletus, which has a common name of Brown Dun, and possibly (but not necessarily) A. vernalis.
… Roger Rohrbeck, 15 March, 2014 - 1:02pm login or register to post comments

Moved
Moved from ID Request.
… v belov, 14 March, 2014 - 11:45am login or register to post comments

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