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The Specimen

Baetisca laurentina (Armored Mayfly) Mayfly DunBaetisca laurentina (Armored Mayfly) Mayfly Dun View 7 Pictures
Collected June 5, 2005 from the Marengo River in Wisconsin
Added to Troutnut.com by on May 25, 2006

The Discussion

Post Reply
TaxonJune 26th, 2006, 2:22 pm
Site Editor
Royse City, TX

Posts: 1350		Jason-

Wow, believe these are the first photos I've seen of winged Baetisca. They certainly have a stout abdomen, don't they. Guess that shouldn't be a particular surprise given the shape of the nymphs, but must admit it startled me.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
TroutnutJune 26th, 2006, 8:51 pm
Administrator
Bellevue, WA

Posts: 2737		I was surprised, too, when I first collected one. I almost instantly knew it had to be Baetisca, but it was still very neat to see. Interestingly, the males are quite a bit less robust -- about half-way between the female Baetiscas and the typical sulphur spinners.

The pretty wing patterns of the duns aren't carried over into the spinners, which have unmarked hyaline wings. Since the spinners are the stage to imitate, people should take note of this difference.

Another interesting thing about Baetiscas is that the males, at least in the spinner stage, aren't as stout as the females. They're still more robust than other mayflies, but it takes a close look to notice the difference.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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