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The Arthropod Story Table of Contents   

Ancient chordates

In 1999, researchers discovered fossil chordates in rocks in China that are 10 million years older than Pikaia! Chordates have been around for a long time — since at least the very early Cambrian. Some chordates evolved skulls and a bony spinal column, becoming the lineage known as vertebrates — of which humans are a small part.



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Pikaia: A chordate

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Hallucigenia


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