Amniotes Evolution Quiz

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5 Questions

What distinguishes amniotes from non-amniote lissamphibians?

Development of three extraembryonic membranes

During which period did amniotes evolve from amphibian ancestors?

Carboniferous period

Which group do synapsids belong to?

Mammals and extinct ancestors like therapsids

What are the three main amniote features crucial for living on land?

Presence of an amniotic buffer, water-impermeable cutes, and a robust air-breathing respiratory system

What is the function of the chorion in amniotes?

Gas exchange

Study Notes

Amniotes vs. Non-Amniote Lissamphibians

  • Amniotes are distinguished from non-amniote lissamphibians by the presence of certain adaptations that enable them to reproduce and thrive on land.

Evolution of Amniotes

  • Amniotes evolved from amphibian ancestors during the Carboniferous period.


  • Synapsids belong to the group of amniotes.

Key Amniote Features

  • Three main features crucial for amniotes to live on land are:
    • Amnios (amniotic membrane)
    • Chorion
    • Allantois

Function of the Chorion

  • The chorion is a membrane that surrounds the embryo and provides it with oxygen and nutrients, while also removing waste products.

Test your knowledge about the evolution of amniotes, a diverse group of tetrapod vertebrates that evolved from amphibian ancestors. Learn about the two main groups of amniotes, sauropsids (reptiles and birds) and synapsids (mammals and extinct ancestors).

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