A never-before-seen species of “hell ant” has been discovered in northeastern Brazil, making it the oldest ant fossil ever found. The ancient insect lived around 113 million years ago during the Cretaceous period and had scythe-like jaws that may have been used to seize and impale its prey. Researchers believe that this discovery challenges their assumptions about how quickly insects developed complex adaptations. The ant species, named Vulcanidris cratensis, was preserved in limestone and is thought to be closely related to other extinct hell ants found in amber fossils in Myanmar. This find is significant not only because of its age but also due to the unique features it possesses, such as upward-facing jaws that are unlike anything seen in modern ants.
Source: https://www.livescience.com/animals/extinct-species/hell-ant-with-scythe-like-jaws-may-be-oldest-ant-fossil-ever-discovered