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leaf mine in cottonwood

leaf mine in cottonwood
Lake Red Rock, Knoxville, Marion County, Iowa, USA
November 10, 2013
Size: ~1 mm wide
Short linear mine in upper surface of old leaf of cottonwood (Populus deltoides) growing in rock ourcrop along lakeshore. Mine not visible on lower surface.

Images of this individual: tag all
leaf mine in cottonwood leaf mine in cottonwood

Caloptilia stigmatella?
That's my best guess at the moment, but I'm not sure.

British leafminer website
Thanks, Charley. I googled that name and found this website hat might provide diagnostic inforrmation:

This is the only species I know of that could produce mines like this; it's just unusual that they are on the upper surface and don't expand into blotches. One author did observe upper surface mines in British Columbia. If there were associated leaf rolls (or more typical mines), I would feel more comfortable going with that ID.

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