Chordate evolution - PowerPoint PPT Presentation

Chapter 25 Animal Evolution – The Chordates Sections 1-5

Chapter 25 Animal Evolution – The Chordates Sections 1-5. 25.1 Transitions Written in Stone. Transitional fossils provide evidence of the evolution of birds from dinosaur ancestors Archaeopteryx , an ancient winged dinosaur with feathers Confuciusornis , a bird with claws on its wings

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26.2 Chordate Evolution

26.2 Chordate Evolution. Embryo evidence suggests earliest chordates were related to echinoderms!. Pikaia - early chordate - has notochord, no bones (also called M ylokunmingia ). Cartilage - strong connective tissue more flexible than bone (came before bone)

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