Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Information, insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa


TaxonomyBrowseInfoImagesLinksBooksData
Photo#267875
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
I was fortunate to observe the phenomenon of a goldenrod gall fly in the act of emerging; a bizarre but extremely fascinating event. This series shows the ptilinum, a structure that characterizes all Schizophora. The ptilinum is an air sac that is pumped out by the emerging fly to pop the cap off the puparium (and the escape portal of the gall, in the case of these flies). Once eclosure is complete, the ptilinum is deflated, leaving behind a scar, better known as the ptilinal suture. In this image, the specimen is upside-down.

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

Eurosta
Great picture series, Stephen!

 
Thanks Matt!
It's nice to hear from you! Steve's gall fly images inspired me to shoot this series, especially after he discussed this phenomenon during the insect diversity course.

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.