Arizona Oak Galls, Part 4

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

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Seven weeks after I collected these, two parasitoids emerged.

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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.

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

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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.

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

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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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