amniote
Noun
Meaning
any member of the Amniota
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Description Size comparison of male S. punctatus and human The tuatara is considered the most unspecialised living amniote ; the brain and mode of locomotion resemble those of amphibians and the heart is more primitive than that of any other reptile.
Environmental sex determination preceded the genetically determined systems of birds and mammals; it is thought that a temperature-dependent amniote was the common ancestor of amniotes with sex chromosomes.