from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of a group of vertebrates that have an amnion during embryonic development, including reptiles, birds, and mammals.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of the Amniota group of vertebrates having an amnion during the development of the embryo; mammals, birds and reptiles.
from the GNU version of the Collaborative International Dictionary of English
- n. any member of the Amniota.
from The Century Dictionary and Cyclopedia
- Possessing an amnion; amniotic.
- n. A member of the Amniota.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any member of the Amniota
Impedance matching of the tympanic middle ear occurred very early in amniote evolution.
Mammary glands evolved in the mammalian lineage after mammals and frogs split from their amniote ancestor.
It was reasonable to assume that these mechanisms would account for embryo elongation, but the actual processes were unknown before the experiments of Bénazéraf and colleagues "A random cell motility gradient downstream of FGF controls elongation of an amniote embryo," Nature 8 July
A random cell motility gradient downstream of FGF controls elongation of an amniote embryo Nature, 466 7303, 248-252 DOI: 10.1038/nature09151
Primitive reptiles were able to radiate into drier habitats than amphibians because of the amniote egg with a leathery or hard shell, and because of their relatively impermeable skin with scales.
Well, I'm supposed to start with a revision of the placodonts and then, "if time allows", to bloat this into an amniote phylogeny.
ABSTRACT In this special issue on the Evo-Devo of amniote integuments, Alibardi has discussed the adaptation of the integument to the land.
Birds are also clearly diapsids and if every living amniote that isnt a mammal is a diapsid then birds are diapsid reptiles too.
I venture that im not the only one who didnt know the early amniote history, and im certain im not the only one who was puzzled by the Nat geo. cladogram.
The thin wall of these first vessels of the amniote embryo consists of flat cells (endothelia or vascular epithelia); the fluid within already contains numbers of red blood-cells; both have been developed from the gut-fibre layer.