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The Specimen

Baetis (Blue-Winged Olives) Mayfly DunBaetis (Blue-Winged Olives) Mayfly Dun View 14 PicturesThis dun molted most of the way into a spinner (though the wings got stuck) the evening after I photographed it, so I took some more photos of the spinner.

I found a female nearby, probably of the same species.
Collected September 19, 2006 from Mystery Creek #43 in New York
Added to Troutnut.com by on October 4, 2006

The Discussion

EntomanOctober 25th, 2011, 3:39 pm
Northern CA & ID

Posts: 2604
Hi Jason,

Excepting Bob Newell's nymphs, I believe the photos on the Acerpenna genus hatch page are actually Baetis. Looking closely at the images shows characters hard to reconcile with Merritt IV couplet 37(36') for Acerpenna that reads in part as follows, "...beyond costal process anterior margin of hind wing undulate; terminal segment of male forceps approximately four times as long as wide..."

The specimens do match up with Baetis by the process of elimination as the preceding couplets and those that follow rule out other possibilities by negative determination. The characters of baetis are so variable that the keys have to be structured this way, I guess.

Regards,

Kurt
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

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