Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES - PowerPoint PPT Presentation

Lecture 6 animal evolution the vertebrates
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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES. Amniotes . The first invertebrates to adapt to dry habitats. The only vertebrates that produce eggs with four membranes: these membranes conserve water; protect the developing embryo before hatching or being born. Have dry, tough or scaly skin.

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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

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Lecture 6 animal evolution the vertebrates

Lecture 6ANIMAL EVOLUTION: THE VERTEBRATES


Amniotes

Amniotes

  • The first invertebrates to adapt to dry habitats.

  • The only vertebrates that produce eggs with four membranes:

    • these membranes conserve water; protect the developing embryo before hatching or being born.

  • Have dry, tough or scaly skin.

  • Active lifestyles


Two major groups of amniotes

Two Major Groups of Amniotes

  • Synapsids (the early branches)

    • mammals and their extinct relatives

  • Sauropsids

    • reptiles and birds.


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