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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Flies (Diptera) » "Acalyptratae" » Tephritoidea » Fruit Flies (Tephritidae) » Tephritinae » Dithrycini » Eurosta » Goldenrod Gall Fly (Eurosta solidaginis)
Photo#267878
Space Alien - Goldenrod Gall Fly emergence - Eurosta solidaginis - female
Copyright © 2009 Stephen Luk

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 The ptilinum has now been deflated and withdrawn into the head, leaving behind the conspicuous, bare suture between the eyes.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
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Contributed by Stephen Luk on 21 April, 2009 - 4:05pm

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.
… MJ Hatfield, 9 May, 2016 - 9:45am login or register to post comments

 
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.
… Stephen Luk, 9 May, 2016 - 4:01pm login or register to post comments

 
Ah ha,
you paid attention!
I'm going to try that. Next year.
Thanks.
… MJ Hatfield, 9 May, 2016 - 6:39pm login or register to post comments

Excellent
Shots of Mr. Potatohead and the result.
… Herschel Raney, 22 April, 2009 - 11:56am login or register to post comments

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?]
… Harsi S. Parker, 21 April, 2009 - 7:17pm login or register to post comments

 
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).
… Stephen Luk, 21 April, 2009 - 8:00pm login or register to post comments

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