Here's how the bacteria stay with the beetle through its entire life cycle.
If you were to compliment a female Lagria beetle on her pupa shell, she'd probably respond,"Thanks, it has pockets!"
Although scientists have known about the pockets and the bacteria that populate the abdomen glands of beetles in the genus Lagria, it was unknown how the two were connected, or how the bacteria ended up in the beetles' abdomens in the first place. Recently, a group of researchers revealed the missing steps of this symbiotic relationship by observing what happened when an adult beetle emerged from its pupa, scanning the pupa and creating digital 3D models.
But Lagria beetles experience some extreme changes in their lives. They emerge from their eggs as wormlike larvae and then grow into immobile, egglike pupae. Inside the pupae, the beetle larvae"get rid of a lot of what they have inside [their bodies] and rebuild," Flórez said. At the end of the pupal stage, adult beetles emerge fully formed.To tackle this question, researchers covered newly pupated beetles with tiny, fluorescent plastic beads measuring just 1 micron thick.
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