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Estimated distribution of family origination during the different key periods. The bottom line shows the number of families in each period as follows: Symphyta/Apocrita non-Aculeata/Aculeata. Silhouettes after Goulet and Huber, except Megachilidae from http://phylopic.org/ (license at https://creativecommons.org/publicdomain/zero/1.0/). ATR, Angiosperm Terrestrial Revolution; MMPR, Mid-Mesozoic Parasitoid Revolution. See also Figure S1, Table S1, and Data S2 and S3.

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