Meet Inostrancevia: The ancient predator that roamed before dinosaurs after Earth's worst extinction

It is difficult to picture how Earth nearly died. About 250 million years ago, life on the planet was hanging by a thread. Scientists refer to this horrific period as the "Great Dying", where it became uncommon and valuable to survive. Today, recent research exposes that a formidable killer known as Inostrancevia emerged during this era of devastation.

The Permian-Triassic extinction eliminated almost 90 percent of all species. The devastating loss came after violent volcanic eruptions throughout the Siberian Traps. The eruptions fuelled lethal climate changes, ocean acidification and global loss of oxygen. Ecosystems broke down in these circumstances, paving the way for newcomers. One of them was Inostrancevia, a gruesome top predator that survived for a brief period amidst the turmoil.

Inostrancevia was one of the gorgonopsians, an order of old carnivorous therapsids. It was distinguished by its huge, saber-like canines and robust, massive body. Its leathery skin probably looked similar to that of today's elephants or rhinoceroses. It weighed up to 400 kilograms and reached almost four metres in length, ruling its environment with very few natural competitors. Inostrancevia primarily fed on dicynodonts and pareiasaurs, herbivorous reptiles with tusks, to place itself at the top of the food chain.

Previously, Inostrancevia fossils were restricted to Russia. Things changed with discoveries reported in 2010 and 2011. Two incomplete skeletons were discovered by palaeontologists in South Africa's Karoo Basin. The NMQR 4000 and NMQR 3707 fossils contained nearly complete skulls and other parts. The implications of the discoveries are that Inostrancevia traveled over 7,000 miles on Pangaea, the ancient supercontinent, to occupy vacant predator niches caused by extinction in the southern districts.