How To Use Amniote In A Sentence
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Understanding of the earliest amniotes has been a central pursuit of vertebrate paleontologists over the past century.
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Lip thing: One of the SVP presentations this year found that, in living amniotes, lips, cheeks, and epidermal tooth coverings space out according to number of foramina in the premax/max/dentaries.
Life's Time Capsule: me, 3D and Plateosaurus...
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The oldest known amniotes - close to the ancestry of all reptiles, birds, and mammals - appeared in the early Pennsylvanian, about 310 million years ago.
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Mammary glands evolved in the mammalian lineage after mammals and frogs split from their amniote ancestor.
About 'What Darwin Got Wrong'
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The amniotes in turn have two main groups: the synapsids (including mammals) and the sauropsids (including reptiles and their fossil relatives).
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The trait of temporal fenestration has been used extensively in phylogenetic studies of amniotes, but unfortunately, it is not a reliable guide to their evolution.
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A random cell motility gradient downstream of FGF controls elongation of an amniote embryo Nature, 466 7303, 248-252 DOI: 10.1038/nature09151
Randomly growing an embryo. It can work. - The Panda's Thumb
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In extant amniotes, however, the VN organ is situated too close to the midline to leave a mark on the maxilla, as is the anlagen of the organ in crocodilian and avian embryos.
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Birds are also clearly diapsids and if every living amniote that isnt a mammal is a diapsid then birds are diapsid reptiles too.
Drawing a Line in the Academic Sand - The Panda's Thumb
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Among the important changes of the vertebrate organisation that marked the rise of the first Amniotes from salamandrine Amphibia during this period the following three are especially noteworthy: the entire disappearance of the water-breathing gills and the conversion of the gill-arches into other organs, the formation of the allantois or primitive urinary sac, and the development of the amnion.
The Evolution of Man — Volume 2
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It has been independently lost or reduced in several amniote lineages, however, including crocodilians, birds, tuataras, iguanian lizards, cetaceans, and catarrhine primates.
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Vertebral counts in modern amniotes, amphibians, and fish, can vary due to environment or change with growth.
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Müller & Tsuji, Impedance-Matching Hearing in Paleozoic Reptiles: Evidence of Advanced Sensory Perception at an Early Stage of Amniote Evolution, PLoS ONE 2007.
A Decade Spanning Single Exchange
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Land amniotes continued to diversify, and by the middle Pennsylvanian had split into several taxa, two of which would go on to dominate the Mesozoic and Cenozoic: the diapsids and the synapsids.
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Amniotes are characterized by the presence of an amniote egg, that is an egg with a hard outer covering that could be laid on land and that contained a membrane, the amnion, that surrounded the embryo in a fluid-filled sac.
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Tetrapods, whose closest living relatives are lungfish, have two main groups: amphibians and amniotes.
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Hydrostats are characterized by a central volume of pressurized incompressible fluid surrounded by a membrane in tension; all amniote intromittent organs include a central space surrounded by a tensile membrane.
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At a very early stage we notice in the embryo of man and the other amniotes, at each side of the head, the remarkable and important structures which we call the gill-arches and gill-clefts (Figures
The Evolution of Man — Volume 1
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For instance the limitation of digit number to a maximum of five among recent amniotes cannot be explained by a developmental constraint per se since polydactyl limbs appear quite frequently.
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Several recent studies have examined the interrelationships of tetrapods in global analyses and are crucial to considerations of the origins of locomotory features in amniotes.
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Since amniote intromittent organs are hydrostatic, it follows that the wall of their erectile structures must be reinforced with inextensible fibers to prevent aneurysms.
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The astragalus of diadectids is identical to those of late Paleozoic terrestrial amniotes in structure and relationship to neighboring elements.
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All the amniotes have a distinctive embryonic membrane known as the amnion
The Evolution of Man — Volume 1
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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
The Panda's Thumb: Development Archives
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Mammals are also amniotes, but they differ from reptiles in the structure of their skulls (especially the regions associated with chewing and hearing).
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This suggestion is based on the observation that locomotion was the primitive function of the hypaxial muscles that are responsible for costal ventilation in modern amniotes.
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The sequence from the early amniotes to the early mammals is the most fully documented of the major transitions in vertebrate evolution.
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The amniotes are a monophyletic group of vertebrates, comprising reptiles, birds, and mammals, that develops in its embryonic life the envelope called amnion.
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In amniotes, the embryo develops in a blastodisk atop a large yolk mass.
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The ancestral amniotes were small animals, superficially resembling primitive, insectivorous lizards.
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The ancestral amniotes were small animals, superficially resembling primitive, insectivorous lizards.
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Impedance matching of the tympanic middle ear occurred very early in amniote evolution.
A Decade Spanning Single Exchange