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Wasp with abdomen laterally compressed. Googling "wasp laterally compressed" gave me Platygastroidea. Correct and can we go further?

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Hi Magnus, it's superfamily Chalcidoidea, Eurytomidae, almost sure Eurytoma sp. female.

Best regards, Marc

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Thank you! I guess it is difficult to identify to species level.

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Magnus, as far as you have the specimen pinned, it should not be a big issue to determine to species level. Eurytoma is not that complicated.
But I can't do it on pic, maybe you have to send it to a specialist, if you need the species name.