The origin and early evolution of ants has always been a hot topic in the scientific community. A new study by the Nanjing Institute of Geology and paleontology, Chinese Academy of Sciences, has confirmed the evolutionary history of the oldest ant population, 100 million years ago. The study was published in the latest issue of current biology. Ants are the most successful social insects and play an important role in modern terrestrial ecosystems. For a long time, it was generally believed that the morphology and ecology of early ants were relatively single. However, in 2016, Wang Bo, a researcher from Nanjing Institute of Geology and paleontology, Chinese Academy of Sciences, and French researchers discovered a group of Unicorn ants (belonging to the black emperor ant) in the Cretaceous amber. < p > < p > since then, several international research teams have found nearly 10 species of monocorne ants from Ambrosia Burmese, which has attracted extensive attention. However, the predatory and evolutionary mechanisms of these ants need to be further confirmed. < / P > < p > on this basis, after more than three years’ efforts, the research team creatively established a “morphological database of fossil ants”, covering 112 representative groups of living and extinct ants, and used big data for morphometric analysis. < / P > < p > after precise calculation, the research team finally confirmed that the ant is obviously different from other fossil and living ant groups, and the “trap jaw” predatory mechanism of up-down linkage may be used to specifically prey on different prey. Although it was very prosperous in the Middle Cretaceous about 100 million years ago, it gradually became extinct in the following 20 to 30 million years. < / P > < p > the researchers speculate that the precise coupled predator-prey system allows the unicorn to hunt alone, but it is also due to the “individual combat” lifestyle that leads to the decline of the unicorn in the competition with the modern ant population with more collective spirit and more division of labor. < / P > < p > “the living ants are all fighting in groups. They are very social and disciplined. The” solitary “unicorn does not have an advantage in the competition with the living ants, and is eventually replaced by a more advanced modern ant group.” Wang Bo said.