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"Convergent evolution of fern nectaries facilitated independent recruitment of ant-bodyguards from flowering plants" https://www.nature.com/articles/s41467-024-48646-x
Convergent evolution of fern nectaries facilitated independent recruitment of ant-bodyguards from flowering plants - Nature Communications
Some plants use nectar to attract ant bodyguards. Here, the authors use a cross-kingdom phylogenetic approach to find that ferns and angiosperms evolved nectaries in the Cretaceous, coinciding with ant evolution, and that ferns recruited ant-bodyguards from existing ant-angiosperm partnerships.