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Overview of Amniotes
Amniotic Egg
- Named for the Amniotic egg
- Four specialized extraembryonic membranes
- Amnion: compartment of fluid that surrounds embryo
- Also protects embryo from physical damage
- Chorion, Yolk Sack, Allantolis: help in gas exchange, nutrients and waste storage
- Embryos no longer needed aquatic habitat to develop
- Similar to seed evolution in plants
- Early eggs had shells
- Lost in many other species
- Use rib cage to ventilate lungs
- More efficient than amphibians
- Loss of gas exchange through the skin
Practice: Overview of Amniotes
What part of the amniotic egg bathes the embryo in protective fluid?
Practice: Amniotes
Which of the following are true of amniotes? (select all that apply)
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