A 280-million-year-old salamander-like apex predator, Gaiasia jennyae, has been unearthed in Namibia, shedding light on the early evolution of land animals, a freshly minted article in the Nature Science journal revealed.
Measuring about 2.5 meters with a large, toilet seat-shaped head and interlocking fangs, Gaiasia was the dominant predator in its ecosystem and one of the largest land predators of its time. It is the "largest digited stem tetrapod known at present," according to the article.
Named after the Gai-As Formation and a world-renowned paleontologist Jenny Clack, the fossils found include skull fragments and a nearly complete spine, indicating a powerful bite for capturing large prey.
The significance of this discovery lies in its location, as most early land animal fossils have previously been found in the ancient equatorial wetlands of what would become Europe and North America. At the time, Namibia was much further south, part of the southern supercontinent of Gondwana.
"Our discovery and identification of a giant stem tetrapod [...] greatly expands our understanding of the morphology, ecology, and biogeography of the initial diversification of tetrapods," the paper said.
While equatorial regions were becoming forested, Namibia’s cooler swamps, possibly near ice patches and glaciers, housed these large predators. This discovery reveals that such predators thrived in harsh climates, in contrast to the evolutionary paths taken by animals in warmer regions that eventually led to mammals, reptiles, and amphibians.