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Photo#196730
Baetidae - Callibaetis fluctuans

Baetidae - Callibaetis fluctuans
Marlton, Burlington County, New Jersey, USA
May 7, 2008
Came to the light at night. Is this maybe Callibaetis? But also looks similar to this one http://www.troutnut.com/specimen/664 Any ideas?

Images of this individual: tag all
Baetidae - Callibaetis fluctuans Baetidae - Callibaetis fluctuans

Callibaetis fluctuans
Hi John-

I believe this male subimago to be Callibaetis fluctuans.

Moved

Moved
Moved from Mayflies.

Baetid
Most, but not all Callibaetis display a distinct speckled pattern on their wings and fine spots on their abdomen. In addition, the pattern of cross-veins seems too sparse for this to be that genus, although I wouldn't completely rule it out because the costal angulation of the minute hindwing is blunt or obtuse. Size might be helpful, if you can remember the size with some degree of accuracy.

Many (most?) baetids are very difficult to take genus with a photo, let alone to species. The species you found on Troutnut is common, transcontinental, and is one of the earliest mayflies to emerge in the East. Despite that, Jason probably keyed it out just to be sure. Even though tricaudatus is often multi-brooded (more than one generation per year), I really doubt that's what your specimen is. Notice the sharp costal angulation on the hindwing in Jason's specimen.

 
ID
How do you feel about Cloeon dipterum for this one? Look pretty close?

 
Yes, except...
that I'm pretty sure that's a tiny hindwing at the base of the forewing. :)

 
Image
Added another to show base better. Looks like you are correct?

 
Yes...
it shows a tiny hindwing with a blunt costal angulation. That might help to get this one to genus at some point. I did find three or four others that probably are C. dipterum.

 
Thanks
I appreciate all of the help (and the great information). It really is nice to learn about these guys. Unfortunately size is unknown. I got the one shot and it was gone, and I would rather not guess and further confuse the issue.

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