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I've found a variety of galls on holm oak trees in Andalucia, Spain. They are very close to each other but each gall is different and on a separate tree. Are they different types of wasp, or a different reaction by the tree?
Maybe you should try a Spanish forum or entomological community like this one: http://entomologia.rediris.es/
Or go to other pages dealing with ID of world species:
Project Noah "is a tool to explore and document wildlife and a platform to harness the power of citizen scientists everywhere". http://www.projectnoah.org/
BugGuide.Net "Identification, Images, & Information For Insects, Spiders & Their Kin For the United States & Canada" http://bugguide.net/node/view/15740
What’s That Bug? "Do you have a bug you need identified? Do you want to submit an interesting photo of a bug?" http://www.whatsthatbug.com/
iSpot "Learn more about wildlife, share your interest with a friendly community and get help identifying what you have seen". http://www.ispotnature.org/