| 单词 | amniote |
| 例句 | Dinosaurs, birds, reptiles and even mammals are known as amniotes, a branch of the vertebrate family tree that evolved approximately 300 million years ago, Wiemann said. Chicken and egg question goes back to ancient times, but there’s a simple answer 2020-03-24T04:00:00Z These embryonic membranes and the lack of a larval stage distinguish amniotes from tetrapod amphibians. Fundamentals of Biology 2015-01-01T00:00:00Z The amniotes are distinguished from amphibians by the presence of a terrestrially adapted egg protected by amniotic membranes. Concepts of Biology 2013-04-25T00:00:00Z And if this experimentation began as far back as 290 million years ago, that could shift researchers’ understanding of the rise of the amniotes. RoboFossil Reveals Locomotion of Beast from Deep Time 2019-01-17T05:00:00Z Researchers believe the creature is a “stem amniote” - an early land-dwelling animal that later evolved into modern mammals, birds and reptiles. Robot recreates the walk of a 290-million-year-old creature 2019-01-16T05:00:00Z Researchers believe the creature is a “stem amniote” — an early land-dwelling animal that later evolved into modern mammals, birds and reptiles. Robot recreates the walk of a 290-million-year-old creature 2019-01-16T05:00:00Z One of the oldest known amniotes is Casineria, which had both amphibian and reptilian characteristics. Fundamentals of Biology 2015-01-01T00:00:00Z The evolution of amniotic membranes meant that the embryos of amniotes could develop within an aquatic environment inside the egg. Concepts of Biology 2013-04-25T00:00:00Z It is known as a 'stem amniote' - an early offshoot of the lineage which led to 'amniotes', namely birds reptiles and mammals. Watch: Robot reveals how ancient reptile ancestor moved 2019-01-15T05:00:00Z It is therefore a good test case for studying the life of an animal on its way to becoming an amniote. Cinematic and scientific techniques combine to show how a long-extinct creature moved 2019-01-15T05:00:00Z Scientists believe the first amphibious animals emerged on land 350 million years ago and the first amniotes emerged around 310 million years ago. Robot recreates the walk of a 290-million-year-old creature 2019-01-16T05:00:00Z The late Paleozoic was a time of diversification of vertebrates, as amniotes emerged and became two different lines that gave rise, on one hand, to mammals, and, on the other hand, to reptiles and birds. Fundamentals of Biology 2015-01-01T00:00:00Z In the past, the most common division of amniotes has been into classes Mammalia, Reptilia, and Aves. Concepts of Biology 2013-04-25T00:00:00Z And since, as mammals, human beings are also amniotes, that, from a human point of view, is an evolutionary twofer. New fossils illuminate the route that led ultimately to human beings 2016-12-08T05:00:00Z Cinematic techniques have recreated the movements on ancient amniote.Credit: Cinematic and scientific techniques combine to show how a long-extinct creature moved 2019-01-15T05:00:00Z Hundreds of millions of years after reptiles, birds, and mammals diverged from this original amniote, we are united by the outcomes of this innovation. Scientists solve the mystery of where feathers, fur and scales come from 2016-06-24T04:00:00Z Tetrapods can be further divided into two groups: amphibians and amniotes. Fundamentals of Biology 2015-01-01T00:00:00Z This led to less dependence on a water environment for development and allowed the amniotes to invade drier areas. Concepts of Biology 2013-04-25T00:00:00Z Romer’s gap, in other words, now seems bridged—and this, in turn, bridges not only the gap in understanding of when tetrapods became terrestrial, but also that concerning when the amniotes evolved. New fossils illuminate the route that led ultimately to human beings 2016-12-08T05:00:00Z When did amniotes first adopt this mode of locomotion? Cinematic and scientific techniques combine to show how a long-extinct creature moved 2019-01-15T05:00:00Z The results also show that these sleep cycles evolved much earlier than previously thought, possibly back to the emergence of amniotes, the study says. Dinosaurs May Have Slept Like Humans, Study Shows 2016-04-29T04:00:00Z The amniotes —reptiles, birds, and mammals—are distinguished from amphibians by their terrestrially adapted egg, which is protected by amniotic membranes. Fundamentals of Biology 2015-01-01T00:00:00Z At the time, the land was ruled by amniotes - a class of four-legged, backboned animal that laid eggs protected by amniotic membranes. Lizards share sleep patterns with humans - BBC News 2016-04-29T04:00:00Z This concluded that a great evolutionary split, between the amphibians and what are known as the amniotes, probably happened during the gap. New fossils illuminate the route that led ultimately to human beings 2016-12-08T05:00:00Z That is, it is an offshoot of the evolutionary line that led to amniotes, but is not a member of the amniotes proper. Cinematic and scientific techniques combine to show how a long-extinct creature moved 2019-01-15T05:00:00Z Prof Xu Xing from the Chinese Academy of Sciences in Beijing commented: "The authors have done a nice piece of work demonstrating the shape changes among amniote eggs. " Egg shape clue to bird survival 2014-11-05T05:00:00Z The amniotic egg is the key characteristic of amniotes. Fundamentals of Biology 2015-01-01T00:00:00Z The adaptation to a terrestrial lifestyle necessitated major changes in the physiological environment of the developing embryo and fetus, resulting in the evolution and specialization of extra-embryonic membranes of the amniote mammals. The African coelacanth genome provides insights into tetrapod evolution 2013-04-17T17:21:37.460Z This phylogenetic distribution has led some authors to conclude that these organs were present in amniote common ancestors. Terrifying sex organs of male turtles 2012-06-09T14:45:00.217Z There may be lots of reasons why males provide parental care in amniotes. Did dinosaurs and pterosaurs practise mutual sexual selection? 2012-01-05T15:45:07.957Z If correct, this analysis would represent a major advance in amniote paleobiology. [Technical Comment] Comment on ?Nocturnality in Dinosaurs Inferred from Scleral Ring and Orbit Morphology? 2011-12-22T19:25:32.243Z In amniotes that lay eggs, the shell of the egg provides protection for the developing embryo while being permeable enough to allow for the exchange of carbon dioxide and oxygen. Fundamentals of Biology 2015-01-01T00:00:00Z Figure 1: Amniote phylogeny based on protein synonymous sites showing major features of amniote evolution. The genome of the green anole lizard and a comparative analysis with birds and mammals 2011-09-28T17:21:44.667Z "One can't possibly expect to comprehend the whole of amniote biology by comparison to the chicken," she says. Lizard Genome Unveiled 2011-08-31T21:15:00.243Z The genealogical tree of the amniote group is clearly indicated in its chief lines by their paleontology, comparative anatomy, and ontogeny. The Evolution of Man — Volume 2 Regardless, no theoretical or empirical justifications are provided for the assertion that Mesozoic amniote activity patterns should conform to those of extant amniotes. [Technical Comment] Comment on ?Nocturnality in Dinosaurs Inferred from Scleral Ring and Orbit Morphology? 2011-12-22T19:25:32.243Z The early amniotes diverged into two main lines soon after the first amniotes arose. Fundamentals of Biology 2015-01-01T00:00:00Z This exon is highly conserved across 29 mammals and therefore probably represents a mammalian innovation since the amniote ancestor. The genome of the green anole lizard and a comparative analysis with birds and mammals 2011-09-28T17:21:44.667Z Vertebrate biologist and palaeontologist Susan Evans at University College London agrees, but thinks that even more amniote sequences are needed. Lizard Genome Unveiled 2011-08-31T21:15:00.243Z The primitive or primordial kidneys of the amniote embryo were formerly called the "Wolffian bodies," and sometimes "Oken's bodies." The Evolution of Man — Volume 2 It is only by the historical and comparative study of these that we can understand the difficult and obscure gastrulation of the amniotes. The Evolution of Man — Volume 1 The trunk of the amniote phylogenetic tree is the ancestral amniote. Fundamentals of Biology 2015-01-01T00:00:00Z The amniote lineage divided into the ancestral lineages of mammals and reptiles ~320 million years ago. The genome of the green anole lizard and a comparative analysis with birds and mammals 2011-09-28T17:21:44.667Z Many more instances of organs, of which the beginning and end have been cut off, might be mentioned; e.g. the muscle-plate coelom of Aves, the primitive streak and the neurenteric canal of amniote blastoderms. Darwin and Modern Science Father, don't go in a hurry, and be not amniote with the maiden! The Poems of Goethe Translated in the original metres The so-called "first trace of the embryo" in the amniotes, or the embryonic shield, in the centre of the pellucid area, consists merely of an early differentiation and formation of the middle dorsal parts. The Evolution of Man — Volume 1 Figure 1: Amniote phylogeny based on protein synonymous sites showing major features of amniote evolution. The genome of the green anole lizard and a comparative analysis with birds and mammals 2011-09-28T17:21:44.667Z The genome of the lizard A. carolinensis thus fills an important gap in the coverage of amniotes, splitting the long branch between mammals and birds and allowing more robust evolutionary analysis of amniote genomes. The genome of the green anole lizard and a comparative analysis with birds and mammals 2011-09-28T17:21:44.667Z The genome sequence of A. carolinensis allows a deeper understanding of amniote evolution. The genome of the green anole lizard and a comparative analysis with birds and mammals 2011-09-28T17:21:44.667Z For instance, if we compare attentively the three successive stages of development that are represented, in twenty different amniotes we find a remarkable likeness. The Evolution of Man — Volume 1 However, as the whole group of the amniotes has been developed at a comparatively late date from the class of the amphibia, their coelomation must also be directly traceable to that of the latter. The Evolution of Man — Volume 1 Of the three vesicular appendages of the amniote embryo which we have now described the amnion has no blood-vessels at any moment of its existence. The Evolution of Man — Volume 1 Also, mobile elements are very young and diverse—more so than in any other sequenced amniote genome. The genome of the green anole lizard and a comparative analysis with birds and mammals 2011-09-28T17:21:44.667Z The bony skull in man and all the other amniotes is more highly differentiated and modified than that of the lower vertebrates, the amphibia and fishes. The Evolution of Man — Volume 1 In the amniotes the ventral wall originates in the same way as the dorsal wall. The Evolution of Man — Volume 1 In most of the amniotes the formation of concentric and radial clefts is irregular from the very first; and so also in the hen's egg. The Evolution of Man — Volume 1 It is formed on the flat embryonic shield of the amniotes from the upper plates of the parietal zone. The Evolution of Man — Volume 1 Among amniotes, genome sequences are available for mammals and birds, but not for non-avian reptiles. The genome of the green anole lizard and a comparative analysis with birds and mammals 2011-09-28T17:21:44.667Z The subsequent head of the amniote is developed from the broader and rounder fore-half of the dorsal shield. The Evolution of Man — Volume 1 The embryonic processes we are now going to consider are essentially the same in all members of the three higher classes of vertebrates which we call the amniotes. The Evolution of Man — Volume 1 When we see that as a fact twenty different amniotes of such divergent characters develop from the same embryonic form, we can easily understand that they may all descend from a common ancestor. The Evolution of Man — Volume 1 These are clearly connected with the fact that the ancestors of the viviparous mammals were oviparous amniotes like the present monotremes, and only gradually became viviparous. The Evolution of Man — Volume 1 |
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