Pikaia

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Pikaia

paleontology

Learn about this topic in these articles:

evolution of chordates

In cephalochordate: Evolution and paleontology
A good possibility is Pikaia, a fossil discovered in the Burgess Shale (Middle Cambrian, about 530 million years old). Pikaia has myotomes and what looks like a notochord, indicating that it is a chordate, but only its shape suggests that it is a lancelet rather than a fish.
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