An animal whose embryo develops in an amnion and chorion and has an allantois; a mammal, bird, or reptile.
- Vertebral counts in modern amniotes, amphibians, and fish, can vary due to environment or change with growth.
- The sequence from the early amniotes to the early mammals is the most fully documented of the major transitions in vertebrate evolution.
- The ancestral amniotes were small animals, superficially resembling primitive, insectivorous lizards.
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