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Photo#267878
Space Alien - Goldenrod Gall Fly emergence - Eurosta solidaginis - female

Space Alien - Goldenrod Gall Fly emergence - Eurosta solidaginis - Female
Guelph, Wellington, Ontario, Canada
April 20, 2009
Size: 8.0 mm
Emerged fly. The ptilinum has now been deflated and withdrawn into the head, leaving behind the conspicuous, bare suture between the eyes.

Images of this individual: tag all
Space Alien - Goldenrod Gall Fly emergence - Eurosta solidaginis - female Space Alien - Goldenrod Gall Fly emergence - Eurosta solidaginis - female Space Alien - Goldenrod Gall Fly emergence - Eurosta solidaginis - female Space Alien - Goldenrod Gall Fly emergence - Eurosta solidaginis - female

Yes, excellent.
But how did you manage to catch it, to be there at the exact right time to see it? Is there some hint you watched for? Did you set the jar next to your computer and there was some sort of quiet noise that alerted you to the happenings? I'd really like to see this.

 
Good timing...
I made sure to collect a large number of galls. I kept the box on my desk; then, when one or two flies appeared, I began to check regularly. Somehow, one day I just managed to catch this individual in its brief emergence act.

 
Ah ha,
you paid attention!
I'm going to try that. Next year.
Thanks.

Excellent
Shots of Mr. Potatohead and the result.

Absolutely fascinating...
...series of images, Stephen. Wow! Really wonderfully captured. Thank you for posting these.

[EDIT: Do you have an image of the gall itself to accompany these photos?]

 
Thank you!
Hi Harsi, thanks for the comments. I don't have an image of the gall, but it pretty much has the appearance of any other wintered goldenrod gall (like Patrick Coin's photos). No holes before emergence of adult, but the larva excavates an escape tunnel prior to pupation (well, that image is the closest I have to the original gall).

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