Ediacaran metazoan embryos?

Animal embryo-like fossils from the Ediacaran Doushantuo Formation, South China, have been interpreted as the earliest metazoan fossils, significantly predating the radiation of biomineralizing animals and macroscopic bilaterians during the Ediacaran–Cambrian transition. This article discusses the fossilization process of these … Continue reading

Human Evolution Out of Africa: The Role of Refugia and Climate Change

Although an African origin of the modern human species is generally accepted, the evolutionary processes involved in the speciation, geographical spread, and eventual extinction of archaic humans outside of Africa are much debated. An additional complexity has been the recent … Continue reading