Here are some key points about ant species: Over 13,800 species: Currently, there are over 13,800 known and identified ant species. Potential for more: Scientists estimate that there could be as many as 22,000 ant species in the world. Greatest diversity in the tropics: Ants are most diverse in tropical regions. Ants are incredibly diverse and play important roles in their ecosystems. They are found on every continent except Antarctica.