| 词汇 | phylum |
| 释义 | phylum noun[ C ] biology specializeduk /ˈfaɪ.ləm/ us /ˈfaɪ.ləm/ a main division in a taxonomic (= scientific naming and organization system) relating to animals: （动物分类的）门 Members of the largest and most diverse phylum of animals (Arthropoda), have segmented bodies and an external skeleton.动物界中数量和种类最多的一个门（节肢动物门）的成员躯体分节，有外骨骼。 Species & genders breed clade class cliff edge femaleness genera genus he holotype intergeneric male multi-species order paramecium same-gender she speciesism strain suborder subspecies phylum | American Dictionaryphylum noun[ C ] us/ˈfɑɪ·ləm/ biology one of the groups into which animals are divided, mainly based on the shape of the animal's body and the way that the body is arranged Examples of phylumphylum Origin of the metazoan phyla: molecular clocks confirm palaeontological estimates. Whereas they are consistent in the classification of lower level taxa, the major divisions of the phylum differ according to the characters used. However, while there are many universal themes underlying fertilisation biology, there are also interesting differences between phyla and even between species. The editors studiously avoid any further mention of ' stocks ', ' phyla ', or ' superfamilies ' of any kind. Operant processes are known to occur in several phyla, suggesting that their origin reaches deeply into the history of life on earth. What it conspicuously doesn't do, however, is say anything too explicit about the origin of phyla. One area of particular interest at the moment in metazoan phylogeny is the status of a number of so-called minor phyla. The free-living planaria tissue section was used as a negative control, because this organism belonged to the same phylum. Eggs may in some cases be partially or totally activated by spermatozoa from a different species or, indeed, phylum. Even at the level of family or phylum, progress is painfully slow. Over the years, we noticed that he was working his way through smaller species and then down the phyla of the animal and insect kingdoms. The model systems reported on for dormancy research from other kingdoms included the tardigrades (or waterbears), a fascinating phylum of approximately 750 species. Since the sampling method used here mitigates the effects on the sample of the postulation of large phyla, this criticism hardly affects the constitution of our sample. Hence, phylum-level conclusions on function should be drawn cautiously. A century and a half on, the mystery of mysteries may have inflated to the origin of phyla, but the approach remains very much the same. 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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