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Photo#1142073
Desert gall on Quercus turbinella (Holly Oak) - Disholcaspis

Desert gall on Quercus turbinella (Holly Oak) - Disholcaspis
Red Rock Canyon National Conservation Area, Las Vegas, Clark County, Nevada, USA
June 11, 2015
Pretty big, but not measured. About thumbnail size, or bigger maybe?

Disholcaspis??? http://bugguide.net/node/view/27075

Tree/bush IDed as likely Quercus turbinella (Holly Oak)
https://www.facebook.com/groups/156706504394635/961951450536799/?notif_t=group_comment
http://www.swcoloradowildflowers.com/Tree%20Enlarged%20Photo%20Pages/quercus%20turbinella.htm

Images of this individual: tag all
Desert gall on Quercus turbinella (Holly Oak) - Disholcaspis Desert gall on Quercus turbinella (Holly Oak) - Disholcaspis Desert gall on Quercus turbinella (Holly Oak) - Disholcaspis Desert gall on Quercus turbinella (Holly Oak) - Disholcaspis

Moved
Moved from Gall Wasps.

likely Disholcaspis gall
Your gall does look similar to Disholcaspis galls. I've only had the occasion once, briefly, to see Q. turbinella, in the New York Mountains in the eastern Mojave (not too far from where you were). So I'm not that familiar with the galls that occur on them. I didn't see this gall in the New York Mtns (doesn't mean it's not there though).

Weld's Cynipid Galls of the Southwest (1) lists 3 described Disholcaspis species (rubens, spissa, edura) on turbinella, and also an undescribed Disholcaspis. There are no descriptions of the galls (would have to dig up the species descriptions to find those), but there are not-so-great drawings of the galls. None of them look quite like yours but I'm not positive none of those are your gall. There's also a chance that this could be D. simulata, even though it's not listed in Weld -- I'm a little doubtful, but maybe. A view of the larval chamber (like this) would provide more information.

Weld lists 4 other detachable stem galls on Q. turbinella, all of which seem pretty different from your gall.

Hopefully someday I'll get a chance to spend more time around Quercus turbinella, and maybe can get a better sense of what galls they have.

Thanks for sharing this on BugGuide, and for including information about what species of oak this is on.

Moved
Moved from Unidentified Galls.

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