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The Middle Cambrian fossil Pikaia and the evolution of chordate swimming http://t.co/GG2D2TTp < #burgessshale #chordata #vertebrateevolution
The Middle Cambrian fossil Pikaia and the evolution of chordate swimming http://t.co/GG2D2TTp < #burgessshale #chordata #vertebrateevolution
Pikaia, explained by Lacalli http://t.co/RLwHveur #evodevo