Palaeospondylus as reconstructed by synchrotron radiation x-ray computed tomography. Credit: RIKEN
Palaeospondylus was a small fish-like vertebrate, about 5 cm long, which had an eel-like body and lived in the Devonian period about 390 million years ago. Although fossils are abundant, its small size and the poor quality of cranial reconstructions—by both CT scan and wax models—have made placing it on thedifficult ever since its discovery in 1890. It's been thought to share features with both jawed and jawless fish and its body has presented evolutionary scientists as a mystery.
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