The Discovery
In 2014, museum members uncovered unusual fossils along a seaside cliff in the Argentine pampas. The bones remained unidentified for years until Eric del Campo, an undergraduate student who later became a paleontologist at the Argentine Museum of Natural Sciences in Buenos Aires, reexamined them. His analysis confirmed the bones belonged to a new saber-toothed species named Pampaluctor calibar. The finding was detailed in a study published in Alcheringa: An Australasian Journal of Palaeontology.
What Scientists Found
The predator was identified as a sparassodont closely linked to thylacosmilids, a group previously believed to have died out three to four million years ago. Weighing approximately 220 pounds and reaching the size of a small horse, Pampaluctor calibar stands as one of the largest mammalian predators ever documented in South America. The exact numerical age of the fossil specimen is not specified in the source; please check the official notice.
Although researchers have not recovered a complete skeleton, the fossilized bones reveal a thick neck, muscular front legs, a tail used for balance, and a short, broad snout with large saber-like teeth. Rather than chasing prey, it functioned as a powerful ambush hunter that relied on physical force to wrestle and overpower animals. Its name reflects these physical traits and local history: "luctor" means to wrestle, while "calibar" honors a 19th-century regional gaucho known for finding lost people and hunting evildoers.
Why It Matters
This discovery reshapes existing theories about prehistoric South America. Researchers previously assumed that native predators were rapidly replaced when northern animals arrived after North and South America fully joined. However, Pampaluctor calibar demonstrates that native South American predators survived longer than anticipated and interacted alongside the new northern arrivals.
Pampaluctor belongs to a group of carnivorous metatherian mammals related to modern marsupials. Other sparassodont species identified from the continent include:
- Borhyaena: A large, wolf-like hunter.
- Paraborhyaena: A bear-sized, saber-toothed creature that represents the largest sparassodont.
- Thylacosmilus: A feline-like animal featuring a pouch and saber teeth.
- Hathliacynida
Source: prehistoric animals new study - BingNews · Published October 23, 2026 · Photo by Julia Fiander on Unsplash