Amniotes
Definition
Amniotes are a clade of tetrapod vertebrates that have an amniotic egg, which allows them to reproduce on land. This group includes reptiles, birds, and mammals.
5 Must Know Facts For Your Next Test
- Amniotes are characterized by having an amniotic egg with specialized membranes that protect the embryo.
- The amniotic egg is divided into several parts: the amnion, chorion, yolk sac, and allantois.
- Amniotes include three major groups: reptiles (including birds) and mammals.
- The development of the amniotic egg allowed vertebrates to lay eggs on land without the risk of desiccation.
- Amniotes are distinguished from amphibians, which typically need water for their reproduction.
Review Questions
- What are the key characteristics that define amniotes?
- Name three major groups included in the amniote clade.
- How does the amniotic egg benefit terrestrial reproduction?
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Related terms
Tetrapods: Vertebrates with four limbs or limb-like appendages.
Amnion: A membrane that forms a protective sac around the embryo in an amniotic egg.
Chorion: The outermost membrane surrounding an embryo in an amniotic egg.
