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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Small Minnow Mayflies (Baetidae) » Baetis » Baetis flavistriga
Photo#1631296
Callibaetis? - Baetis flavistriga
Copyright © 2019 Ken Schneider

Callibaetis? - Baetis flavistriga
Leesville Road, 3.7 road miles E of Bear Valley Rd, Colusa County, California, USA
January 30, 2019
Size: ca 10 mm
Beat from Gray Pine. No river or pond within a few hundred meters, as best I could tell.
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Contributed by Ken Schneider on 30 January, 2019 - 7:15pm
Last updated 9 June, 2019 - 10:20am

Moved
Moved from Baetis bicaudatus.
… Roger Rohrbeck, 9 June, 2019 - 10:20am login or register to post comments

Moved
Moved from Mayflies.
… Roger Rohrbeck, 31 January, 2019 - 1:02am login or register to post comments

Baetis bicaudatus
Hi Ken,

Not Callibaetis, as the hind wings are not the the right shape for that genus. I believe this male imago to be Baetis bicaudatus.

Incidentally, mayfly body length is measured from the front of the head to the end of the abdomen, and doesn't include the length of the tails. Given the thread count of your beat cloth as listed in your profile (3.3 threads per millimeter), I would estimate the body length of this mayfly to be ~4.5 mm.
… Roger Rohrbeck, 31 January, 2019 - 12:49am login or register to post comments

 
Thanks -
very much, Roger - a new one for me! Yes, I am aware of what to measure - I usually initially compare the length of the bug (minus tails or legs) to the width of my finger, which is how I got to 10 mm. This one was a bit harder with the curled abdomen, so I may have been pretty far off, sorry! Interestingly, when I try to count threads on this image and compare to body length, I'm still getting something like 8 mm, so there is clearly some room for error or subjectivity with pics like this...

Edit - my black light sheet has 3.3 threads per mm, but my beat sheet (this image) has 2.0 threads per mm.
… Ken Schneider, 31 January, 2019 - 9:11am login or register to post comments

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