Gunnar Säve-Söderbergh

Säve-Söderbergh discovered and described Ichthyostega, a Devonian-era animal that is one of the earliest known tetrapods and a critical transitional fossil between fish and land-dwelling vertebrates. His description of Ichthyostega fundamentally shaped scientific understanding of how vertebrates colonized land.

Säve-Söderbergh led multiple fossil-hunting expeditions to East Greenland during the 1930s, where Devonian-age rock formations preserved early tetrapod remains. These expeditions were part of broader Scandinavian geological surveys of Greenland conducted during that decade.

Ichthyostega possessed both fish-like features such as gills and a finned tail, and tetrapod features including limbs with digits, making it one of the most important fossils for understanding the fish-to-land-vertebrate transition. It lived during the Late Devonian period, roughly 370 million years ago.

Säve-Söderbergh was part of the Swedish paleontological community, and his East Greenland expeditions were organized in connection with Swedish and Danish scientific survey programs. His work on early vertebrates contributed to Sweden's prominent role in 20th-century paleontology.