1) Craniate 2) Higher vertebrates 3) Vertebrate 
• (n. pl.) That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals.
Am`ni·o'ta noun plural [ New Latin See Amnion .] (Zoology) That group of vertebrates which develops in its embryonic life the envelope called the amnion . It comprises the reptiles, the birds, and the mammals. 
Type: Term Pronunciation: am′nē-ō′tă Definitions: 1. A group of vertebrates the embryos of which are enclosed in an amnion; it includes all the reptiles, birds, and mammals.
[n] - higher vertebrates (reptiles
noun higher vertebrates (reptiles, birds and mammals) possessing an amnion during development