The xenobee has split from the bumbleworm. Because the cave palmworm died out, and there is also the joint-winged treeworm to feed from, they moved from the caves into the open rainforest. Xenobees build hives just like their ancestors, but they can be built on any flora, not just the joint-winged treeworm.
In physical changes, the mouth can bend when sucking nectar, giving it the advantage of not having to fly in the opposite direction. The cloaca now has lip-like appendages. When copulating, they cloacally kiss each other to pass reproductive material.