Deep in the dry hills of Bulgaria's Eastern Rhodopes Mountains, two scientists have uncovered something tiny but significant: a brand-new species of harvester ant that the world has never catalogued before.
Researchers Albena Lapeva-Gjonova of Sofia University in Bulgaria and Lech Borowiec of the University of Wrocław in Poland found the ant while studying the region's wildlife. They named it Messor odrysarum — a nod to the ancient Thracian kingdom of Odrysia, which ruled those same hills more than 2,500 years ago.
"We chose the specific name to honor the ancient Thracian state of Odrysia," the researchers explained in their paper, published in the journal ZooKeys.
The new ant joins eight other known species of the Messor genus in Bulgaria. These small insects play a big role in their ecosystems: they spend their days gathering seeds and grains, acting like tiny farmers of the grasslands and oak forests where they live.
Scientists discovered Messor odrysarum living at elevations up to 647 meters (about 2,100 feet) above sea level. The ants build their nests at ground level along dirt roads, hidden among oak forests and open grasslands. The researchers even spotted seed remains near the nest entrances during late summer — evidence of their hard-working foraging habits.
To confirm this was truly a new species, the team used two methods: careful physical examination under microscopes and a DNA technique called COI barcoding, which is like reading a genetic fingerprint unique to each species.
Messor odrysarum turned out to be a smaller ant than its relatives, with a reddish tint on its cheeks and a narrower head behind the eyes. Its body is covered in longer, denser hairs than similar species in the area.
So far, this ant has only been found in Bulgaria's Eastern Rhodopes region. The researchers think it might also live across the border in parts of Greece and Turkey, but more surveys are needed to know for sure.
The discovery matters because it adds to our understanding of biodiversity — the variety of life on Earth — in a part of Europe that scientists are still learning about. Each new species described helps researchers better protect these ecosystems for the future.
The Eastern Rhodopes Mountains, with their warm, dry slopes and ancient forests, continue to reveal surprises to those who look closely enough.