Conodont tooth

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A 300-million-year-old tooth, from the extinct conodont Gondolella. This specimen, which is coated in gold, is the size of a pinhead (1.5 mm). Conodonts were small eel-like creatures with jaws unlike those of any modern animal. They died out about 200 million years ago. Image: David Jones and Mark Purnell, Univ. of Leicester.

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