amniota
Noun
Meaning
That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals.
Source: Webster's dictionarySynonyms
Hypernyms
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Examples
It is just a section of the clade Amniota : the section that is left after the Mammalia and Aves have been hived off.
Mammalia and Aves are, in fact, subclades within the grand clade of the Amniota.