Lystrosaurus

Lystrosaurus was a pig-sized, herbivorous dicynodont therapsid that lived during the Late Permian and Early Triassic periods. Its name, meaning 'shovel lizard,' refers to its uniquely shaped skull. Physically, it was a robust, barrel-chested animal with a short, deep skull, a horny beak for shearing vegetation, and two prominent tusks that grew continuously from its upper jaw, likely used for digging up roots and tubers. Its forelimbs were more powerful than its hindlimbs, suggesting a sprawling, semi-erect posture well-suited for digging and burrowing. Fossils indicate it was a social animal, possibly living in herds. Lystrosaurus holds a place of immense importance in paleontology as the ultimate 'disaster taxon.' It is one of the very few land animals to have survived the Permian-Triassic extinction event, also known as 'The Great Dying,' which wiped out approximately 90% of all species on Earth. In the immediate aftermath of this cataclysm, Lystrosaurus became astonishingly abundant, with its fossils comprising up to 95% of the total terrestrial vertebrate fauna in some Early Triassic fossil beds. This 'Lystrosaurus Zone' provides a clear geological marker for the extinction boundary. Its survival and subsequent proliferation are attributed to its burrowing habits, which may have protected it from the harsh surface conditions, and its generalized diet. The global distribution of Lystrosaurus fossils across South Africa, India, and Antarctica was also one of the key pieces of evidence used by Alfred Wegener to support his theory of continental drift.