| 释义 |
Definition of amniote in English: amniotenounˈamnɪəʊtˈamnēˌōt Zoology An animal whose embryo develops in an amnion and chorion and has an allantois; a mammal, bird, or reptile. Example sentencesExamples - The sequence from the early amniotes to the early mammals is the most fully documented of the major transitions in vertebrate evolution.
- Mammals are also amniotes, but they differ from reptiles in the structure of their skulls (especially the regions associated with chewing and hearing).
- The ancestral amniotes were small animals, superficially resembling primitive, insectivorous lizards.
- The oldest known amniotes - close to the ancestry of all reptiles, birds, and mammals - appeared in the early Pennsylvanian, about 310 million years ago.
- Vertebral counts in modern amniotes, amphibians, and fish, can vary due to environment or change with growth.
Origin Late 19th century: from modern Latin Amniota, back-formation from amniotic. Definition of amniote in US English: amniotenounˈamnēˌōt Zoology An animal whose embryo develops in an amnion and chorion and has an allantois; a mammal, bird, or reptile. Example sentencesExamples - The sequence from the early amniotes to the early mammals is the most fully documented of the major transitions in vertebrate evolution.
- The ancestral amniotes were small animals, superficially resembling primitive, insectivorous lizards.
- The oldest known amniotes - close to the ancestry of all reptiles, birds, and mammals - appeared in the early Pennsylvanian, about 310 million years ago.
- Vertebral counts in modern amniotes, amphibians, and fish, can vary due to environment or change with growth.
- Mammals are also amniotes, but they differ from reptiles in the structure of their skulls (especially the regions associated with chewing and hearing).
Origin Late 19th century: from modern Latin Amniota, back-formation from amniotic. |