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The fossilized skull of a 455-million-year-old fish reveals an anatomy that's completely new to the study of vertebrates, bridging a knowledge gap of 100 million years.
A study of an ancient fish fossil has provided fresh insights into the evolution of vertebrates’ skulls. The 455-million-year-old skull fossil belonged to a jawless fish called Eriptychius americanus.
X-rays of an ancient jawless fish shows earliest-known example of internal cartilage skull, unlike that of any other known vertebrate.