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Home » Guide » Arthropods (Arthropoda) » Unidentified Tracks, Sign, and Other Mysteries » Unidentified Leaf Mines
Photo#1220905
Young alder sawfly mine?
Copyright © 2016 Christopher Adam

Young alder sawfly mine?
Herring Cove, Campobello Is, Charlotte County, New Brunswick, Canada
August 15, 2015
A young mine of Fenusa dohrnii - European Alder Leafminer on alder, Alnus incana?

Images of this individual: tag all
Young alder sawfly mine? Young alder sawfly mine?
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Contributed by Christopher Adam on 8 May, 2016 - 8:02pm

This one is strange...
It doesn't look like Fenusa dohrnii, but also doesn't seem to match anything else that has been found on alder.
… Charley Eiseman, 9 May, 2016 - 7:32pm login or register to post comments

 
Check the right-hand image ..
HERE. This might be a young mine.
… Christopher Adam, 6 October, 2016 - 5:57pm login or register to post comments

 
The problem with this mine...
is the frass. It seems to be a secondary mine, which the larva initiated by chewing in through the upper epidermis, leaving a little bit of frass on top of the leaf as it did so. Nothing in the tribe Fenusini is able to do this. Maybe it's an illusion, but also notice how the frass in the Fenusa dohrnii mines is in discrete, oblong pellets, whereas in this mine it's mostly in a compact mass.
… Charley Eiseman, 30 October, 2016 - 1:34pm login or register to post comments

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