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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

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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  1. Lecture 6ANIMAL EVOLUTION: THE VERTEBRATES

  2. 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

  3. Two Major Groups of Amniotes • Synapsids (the early branches) • mammals and their extinct relatives • Sauropsids • reptiles and birds.

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