Dino impact also wiped bees

Currently, the widely accepted theory is that an asteroid or comet struck our planet 66 million years ago (the Cretaceous-Paleogene event, or K-Pg event), the impact and its effects basically wiping out dinosaur populations. This extinction however was selective – in that it affected some groups much more than it affected others.
The main problem when studying bees is that they leave behind a smaller fossil record than dinosaurs, and therefore it’s very hard to trace patterns. The paleontologists used molecular phylogenetic analyses (evolutionary relationships) to show that one bee group, the Xylocopinae, which originated in the mid-Cretaceous was all but wiped out by the catastrophic event. Previous studies had suggested a widespread extinction among flowering plants during the Cretaceous-Paleogene extinction event, and many assumed that this plant downfall also left marks in pollinator populations, but until now, this remained a theory.