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Stationary mayfly - Callibaetis pictus

Stationary mayfly - Callibaetis pictus
Santa Cruz, Santa Cruz County, California, USA
June 5, 2016
Size: ~8mm excl. cerci
Mayfly has been stationary on my office wall for 24 hours now. Is this a subimago in its molting process? I suppose time will tell...

Moved from Mayflies.

Callibaetis pictus
Hi Andy-

I believe this female imago to be Callibaetis pictus.

Following mating, female imagoes of genera Callibaetis and Cloeon seek a safe place to remain stationary for five days or so, until their eggs have matured. Once their eggs are mature, the female imago flies off to land on the water, and deposit her load of eggs, which immediately start hatching.

This behavior is unique to genera Callibaetis and Cloeon, as the eggs of other mayfly genera require up to two weeks following oviposition to begin hatching.

Hope this adequately answers your question.

Thanks Roger, for the ID and
Thanks Roger, for the ID and the explanation. I actually found your website while briefly researching this subject, and was duly impressed. Thanks for your work

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