Image: Pikaia BW
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Description: Pikaia gracilens, the earliest known vertebrate ancestor, from the Middle Cambrian of British Columbia, digital
Title: Pikaia BW
Credit: Own work
Author: Nobu Tamura (http://spinops.blogspot.com)
Usage Terms: Creative Commons Attribution 3.0
License: CC BY 3.0
License Link: http://creativecommons.org/licenses/by/3.0
Attribution Required?: Yes
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