Amniotic animals (Amniote) is a group of four-legged vertebrates, including monotremes (mammals and reptiles like breast-feeding) and lizard-shaped class (reptiles, dinosaurs, birds). Animal eggs by the amniotic membrane, viviparous reproduction, etc., to protect the embryo from the multilayer film. The difference between animals and amphibians amniotic membrane is to protect the embryo membrane, and the lack of larvae to adult stage of deformation. Amniotic membrane is the first animal Casineria kiddi, living in 340 million years ago, such a small lizard. Their eggs can be in an environment away from the water, so that animal migration into the amniotic membrane drier environment. Amniotic eggs, animal waste and emissions of air can be exchanged, so that the amniotic egg and animals to larger trends. Amniotic membrane distributed in the global animal, and become the dominant land animals. The oldest known monotreme is Protoclepsydrops, living in 320 million years ago, while the oldest reptiles may be the original ancient lizard Division (Protorothyrididae) window of the ancient dragon, mid-century life in Pennsylvania, about 3 112 million years ago to 300 million 600 million years ago.
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Definition and characteristics
Which is defined as the vast layers of the embryo to develop film, including: amnion, chorion, urine membrane. Directly grow into embryonic limbs with thick layers of epithelial terrestrial forms, rather than as a tadpole amphibian larvae that first and then completely changed the way the body. In amniotic animals, two changes to the skin epithelium by embryonic thyroid hormones to cause, rather than completely deformed. The unique characteristics of animal embryo amniotic eggs caused by specialization to survive in a drier environment, there is a large volume of egg yolk. There are three main groups amniotic animals, by the structure of the skull and temporal Ru eye to identify the number of holes. No bow animals (turtle) no hole, single-arch type (mammals and their close relatives) have a hole, most of the double-bow class (most of the reptiles, dinosaurs, birds) have two holes. Fossilized remains of animals used amniotic they are at least two pairs of sacral ribs, and knees on the talus to confirm
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No. 3
Amniotic animals (Amniote) is a group of four-legged vertebrates, including monotremes (mammals and reptiles like breast-feeding) and lizard-shaped class (reptiles, dinosaurs, birds). Animal eggs by the amniotic membrane, viviparous reproduction, etc., to protect the embryo from the multilayer film. The difference between animals and amphibians amniotic membrane is to protect the embryo membrane, and the lack of larvae to adult stage of deformation. Amniotic membrane is the first animal Casineria kiddi, living in 340 million years ago, such a small lizard. Their eggs can be in an environment away from the water, so that animal migration into the amniotic membrane drier environment. Amniotic eggs, animal waste and emissions of air can be exchanged, so that the amniotic egg and animals to larger trends. Amniotic membrane distributed in the global animal, and become the dominant land animals. The oldest known monotreme is Protoclepsydrops, living in 320 million years ago, while the oldest reptiles may be the original ancient lizard Division (Protorothyrididae) window of the ancient dragon, mid-century life in Pennsylvania, about 3 112 million years ago to 300 million 600 million years ago. Reptilia Amphibia is further adapted on the basis of terrestrial life, completely free from dependence on the aquatic environment, which is the real life to adapt to changes in temperature and terrestrial vertebrates. Reptilia not only into the structure of the body to adapt to the terrestrial, but also different from the reproduction of amphibians: on land to lay eggs, hatch in the land; in embryonic development, resulting in the amniotic, allantoic and other embryonic membranes, the embryo may be out of water and dry environment on land development. This is the birds and mammals and higher shared features, the Reptilia, Aves and Mammalia referred to as amniotic animals. Classification Reptile animal-shaped animal Reptiliomorpha amnion Amniota Casineria (an early amniotic animal) combined Bow Gang Synapsida - like breast-feeding lizard-shaped reptile mammal Mammalia Gang Sauropsida - Reptiles Batropetes no reptiles Eureptilia Kong Yagang Anapsida really big nose Long Branch Captorhinidae original ancient lizard Section Protorothyrididae forest lizard Hylonomus dual Kong Yagang Diapsida Aves Aves
Sauropsida