Side-stepping secondary symbionts: widespread horizontal transfer across and beyond the Aphidoidea

To elucidate the co‐evolutionary relationships between phloem‐feeding insects and their secondary, or facultative, bacterial symbionts, we explore the distributions of three such microbes — provisionally named the R‐type (or PASS, or S‐sym), T‐type (or PABS), and U‐type — across a number of aphid an...

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