| 单词 | ammonoid |
| 释义 | ammonoid noun[C] uk/ˈæm.ə.nɔɪd/us/ˈæm.ə.nɔɪd/anammonite 菊石（见ammonite）Palaeontology & fossils
ammonoid| American Dictionaryammonoid noun[C] us/ˈæm·əˌnɔɪd/earth science anammonite Examplesofammonoidammonoid The zone is 170 m thick, and ammonoids and other fossils occur as imprints in mudstones and as shell-rich layers in sandy turbidites. From theCambridge English Corpus The diversity of theammonoidassemblage in this zone has increased to five genera and about 15 species. From theCambridge English Corpus Quite detailed correlations are not possible yet, but one can clearly see a westward diachronism in the first occurrence of someammonoidgenera. From theCambridge English Corpus Abundant concretions at several levels contain well-preserved ammonoids, bivalves and occasional fish. From theCambridge English Corpus Moreover, in the study of a highly diversified group such as the ammonoids, we believe that making too many generalizations can be risky. From theCambridge English Corpus This zone is widely distributed, 20-150 m thick, and contains the most diverseammonoidassemblage with seven genera. From theCambridge English Corpus The number ofammonoidgenera is greatly reduced to four, combined with a gradual shallowing-upward trend in the succession. From theCambridge English Corpus Brachiopods, cephalopods (ammonoids and one nautiloid) and bivalves are rare. From theCambridge English Corpus Plasticity of developmental timing as the underlying cause of high speciation rates in ammonoids. From theCambridge English Corpus However, the preservation of the collected material is too poor and the total number of ammonoids from single beds is too scarce to allow such a revision to be undertaken. From theCambridge English Corpus They are an extinct group ofammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids. From Wikipedia  This example is from Wikipedia and may be reused under a CC BY-SA license.They are an extinct group ofammonoid, which are shelled cephalopods related to squids, belemnites, octopodes, and cuttlefish, and more distantly to the nautiloids. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.They are an extinct group ofammonoid, which are shelled cephalopods related to squids, belemnites, octopuses and cuttlefish, and more distantly to the nautiloids. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.It is the outermost or last chamber in the shell of a nautiloid orammonoid. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.In the seas, a novel major group ofammonoidcephalopods called clymeniids appeared, underwent tremendous diversification and spread worldwide, then just as suddenly went extinct. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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