11. Amniotes were more suited to the new conditions.12. Thus, the term mesonephros is usually reserved for the embryonic kidney of amniotes . 13. The transverse processes of mammals are homologous to the cervical ribs of other amniotes . 14. The first fully terrestrial vertebrates were amniotes . 15. Together with turtles, the tuatara has the most primitive hearing organs among the amniotes . 16. Turtles are classified as amniotes , along with other reptiles, birds, and mammals. 17. These embryonic membranes and the lack of a larval stage distinguish amniotes from tetrapod amphibians. 18. Post cranial remains of amniotes can be identified from their astragalus bone in the ankle. 19. Sauropsids evolved from basal amniotes stock approximately 320 million years ago in the Paleozoic Era. 20. The phylogenetic position of mesosaurs influences the current understanding of how amniotes evolved temporal fenestrae.
