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15.13: Introduction to Amniotes

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    44736
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    What you’ll learn to do: Identify characteristics of amniotes

    Amniotes are a clade of tetrapod vertebrates comprising the reptiles, birds, and mammals. Amniotes are characterized by having an egg equipped with an amnion, an adaptation to lay eggs on land or retain the fertilized egg within the mother.

    Amniote embryos, whether laid as eggs or carried by the female, are protected and aided by several extensive membranes. In eutherian mammals (such as humans), these membranes include the amniotic sac that surrounds the fetus. These embryonic membranes and the lack of a larval stage distinguish amniotes from tetrapod amphibians.

    Contributors and Attributions

    CC licensed content, Original
    • Introduction to Amniotes. Authored by: Shelli Carter and Lumen Learning. Provided by: Lumen Learning. License: CC BY: Attribution
    CC licensed content, Shared previously

    15.13: Introduction to Amniotes is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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