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vertebrata    
脊椎动物门

脊椎动物门

Vertebrata
n 1: fishes; amphibians; reptiles; birds; mammals [synonym:
{Vertebrata}, {subphylum Vertebrata}, {Craniata},
{subphylum Craniata}]


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  • Vertebrate | Definition, Characteristics, Examples, Classification . . .
    Vertebrate, any animal of the subphylum Vertebrata They have backbones and are also characterized by a muscular system consisting primarily of bilaterally paired masses and a central nervous system partly enclosed within the backbone Its members include fishes, amphibians, reptiles, birds, and mammals
  • Vertebrate - Evolution, Paleontology, Anatomy | Britannica
    Vertebrate - Evolution, Paleontology, Anatomy: The ancestral vertebrate (protovertebrate) has been sought for more than 100 years, but since the protovertebrate was probably small and soft-bodied it is unlikely a fossilized form will be found in a recognizable condition In the classification presented here subphylum Vertebrata is divided into eight classes
  • Anatomy of a vertebrate | Britannica
    vertebrate, Any animal of the chordate subphylum Vertebrata, which includes the fishes, amphibians, reptiles, birds, and mammals
  • Animal reproductive system - Vertebrates, Fertilization, Reproduction . . .
    Animal reproductive system - Vertebrates, Fertilization, Reproduction: The reproductive organs of vertebrates consist of gonads and associated ducts and glands In addition, some vertebrates, including some of the more primitive fishes, have organs for sperm transfer or ovipository (egg-laying) organs Gonads produce the gametes and hormones essential for reproduction Associated ducts and
  • vertebrate - Students | Britannica Kids | Homework Help
    Animals with backbones are called vertebrates They comprise one of the best-known groups of animals and include fishes, amphibians, reptiles, birds, and mammals, including…
  • Vertebrate - Tetrapods, Anatomy, Adaptations | Britannica
    Vertebrate - Tetrapods, Anatomy, Adaptations: Tetrapods live primarily on land and are similar in habit Members include amphibians, reptiles, birds, and mammals Features include the notochord, dorsal nerve tube, and pharyngeal slits Support and protection are provided by the exoskeleton, when present, and the endoskeleton Vertebrate tissue development is unique in its complexity
  • Circulatory system - Heart, Blood Vessels, Oxygen | Britannica
    Circulatory system - Heart, Blood Vessels, Oxygen: All vertebrates have circulatory systems based on a common plan, and so vertebrate systems show much less variety than do those of invertebrates Although it is impossible to trace the evolution of the circulatory system by using fossils (because blood vessels do not fossilize as do bones and teeth), it is possible to theorize on its evolution
  • Skeleton - Bones, Joints, Muscles | Britannica
    Skeleton - Bones, Joints, Muscles: In vertebrates the adult skeleton is usually formed of bone or cartilage—living substances that grow with the animal, in contrast to the many types of invertebrate skeleton that do not grow or are dead secretions, deposits, or crystals The internal position of bones and their central position in limbs provide firm support for small and large animals
  • Chordate | Definition, Characteristics, Facts | Britannica
    Chordate, any member of the phylum Chordata, which includes the vertebrates, the most highly evolved animals, as well as two other subphyla—the tunicates and cephalochordates Some classifications also include the phylum Hemichordata with the chordates
  • Vertebrate - Nervous System, Sensory Organs | Britannica
    Vertebrate - Nervous System, Sensory Organs: The dorsal position, tubular structure, and epidermal origin of the central nervous system are definitive of the chordates Vertebrates have distinctive digestive, excretory, and respiratory systems They have a closed circulatory system, and their endocrine system is characterized by its separate organs





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