250 million years back, it was covered in forests and rivers, and the temperature rarely dipped below freezing. It was likewise home to diverse wildlife, including early relatives of the dinosaurs. Researchers have quite recently found the newest member from that family—an iguana-sized reptile whose name signifies “Antarctic king.”
“This new animal was an archosaur, an early relative of crocodiles and dinosaurs,” says Brandon Peecook, a Field Museum researcher and lead author of a paper in the Journal of Vertebrate Paleontology describing the new species. “On its own, it just looks a little like a lizard, but evolutionarily, it’s one of the first members of that big group. It tells us how dinosaurs and their closest relatives evolved and spread.”
The fossil skeleton is inadequate, however paleontologists still have a decent vibe for the creature, named Antarctanax shackletoni (the former means “Antarctic king,” the latter is a nod to polar explorer Ernest Shackleton). In view of its similitudes to other fossil creatures, Peecook and his coauthors (Roger Smith of the University of Witwatersrand and the Iziko South African Museum and Christian Sidor of the Burke Museum and University of Washington) induce that Antarctanax was a carnivore that hunted bugs, early mammal relatives, and amphibians.
The most intriguing thing about Antarctanax, however, is the place it lived, and when. “The more we find out about prehistoric Antarctica, the weirder it is,” says Peecook, who is also affiliated with the Burke Museum. “We thought that Antarctic animals would be similar to the ones that were living in southern Africa, since those landmasses were joined back then. But we’re finding that Antarctica’s wildlife is surprisingly unique.”
Around two million years previously Antarctanax lived—the blink of an eye in geologic time—Earth experienced its greatest ever mass extinction. Environmental change, brought about by volcanic emissions, murdered 90% of all creature life. The years immediately after that eradication occasion were an evolutionary free-for-all—with the slate cleaned off by the mass annihilation, new groups of creatures competed to fill the gaps. The archosaurs, including dinosaurs, were one of the groups that experienced enormous growth. “Before the mass extinction, archosaurs were only found around the Equator, but after it, they were everywhere,” says Peecook. “And Antarctica had a combination of these brand-new animals and stragglers of animals that were already extinct in most places—what paleontologists call ‘dead clades walking.’ You’ve got tomorrow’s animals and yesterday’s animals, cohabiting in a cool place.”
The way that researchers have found Antarctanax helps reinforce the possibility that Antarctica was a position of fast development and diversification after the mass extinction. “The more different kinds of animals we find, the more we learn about the pattern of archosaurs taking over after the mass extinction,” notes Peecook.
“Antarctica is one of those places on Earth, like the bottom of the sea, where we’re still in the very early stages of exploration,” says Peecook. “Antarctanax is our little part of discovering the history of Antarctica.”
