Arizona Oak Galls, Part 4

Here is yet another type of gall found on the underside of oak leaves in Madera Canyon.


Seven weeks after I collected these, two parasitoids emerged.


The one above is another male Torymus (Torymidae), which may or may not be the same as the one in my last post.  The one below is a male Brasema (Eupelmidae), and according to Gary Gibson, probably can’t be identified beyond that–both because it is a male and because the genus is in serious need of revision.

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Nearly four months later, two adult cynipids emerged.

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In the meantime another male Torymus had emerged.  Another month passed, and a female T. tubicola emerged.


Finally, after another 3+ months, I noticed a different, tiny cynipid in the vial.


I believe it came from the little cup-shaped gall that was also on the leaf.  Apparently I hadn’t noticed that gall before, or didn’t think it was viable.


It is evidently different from gall #2, being fuzzy and lacking the “saucer.”


I think the host might be Quercus grisea rather than Q. arizonica in this case?

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About Charley Eiseman

I am a freelance naturalist, endlessly fascinated by the interconnections of all the living and nonliving things around me. I am the lead author of Tracks & Sign of Insects and Other Invertebrates (Stackpole Books, 2010), and continue to collect photographs and information on this subject. These days I am especially drawn to galls, leaf mines, and other plant-insect interactions.
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2 Responses to Arizona Oak Galls, Part 4

  1. Josh C'deBaca says:

    Again I’m pretty late to this and you may already know this, but the adult you got from the cup-shaped gall is an inquiline likely in the family Synergini. The gall looks like Phylloteras cupella, and the inducers for that species would all be wingless females, similar to Acraspis. Great pics of all of this stuff!

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