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  1. Pikaia - Wikipedia

  2. Facts and Figures About Pikaia - ThoughtCo

  3. 皮卡蟲 - 维基百科,自由的百科全书

  4. 皮卡虫 - 百度百科

  5. The Middle Cambrian fossil Pikaia and the evolution of chordate ...

  6. A new interpretation of Pikaia reveals the origins of the chordate …

  7. Worm-like fossil a 'distant cousin' of humans | CBC News

  8. The Cambrian fossil Pikaia , and the origin of chordate somites

  9. (PDF) The Middle Cambrian fossil Pikaia and the origin

  10. Human's oldest ancestor found - University of Cambridge