Linda Bower sent me these pictures of some cool galls on hackberry leaves. The little spike on top was very distinctive. I think they are Hackberry Thorn Galls produced by a midge, Celticecis spiniformis. As is true of many galls, the midge is rarely photographed or identified and they are known by their gall. In the case of hackberry leaf galls, there are lots of different shapes and I was lucky that this one is so unique with the little horn on top.
|View from above - Hershey Kisses? - LB|
|Bisected gall and larva - LB|
* Charley Eiseman has a set of photographs showing the wide range of unique shapes of Celticecis sp. galls in Bugtracks.wordpress.com.
** The North American Gall Midges (Diptera: Cecidomyiidae) of Hackberries (Cannabaceae: Celtis spp.)by Raymond J. Gagné and John C. Moser at Darwin.ansp.org