| 词汇 | echinoderm |
| 释义 | echinoderm noun[ C ] biology specializeduk /ekˈaɪ.nəʊ.dɜːm/ us /ɪˈkaɪ.noʊ.dɝːm/ a type of sea creature with raised areas or sharp points on its skin and a body made of five equal parts arranged around the centre: 棘皮动物（一种海洋生物，表皮有凸起或棘刺，身体呈五辐对称形） Echinoderms like the starfish live on the sea floor.像海星这样的棘皮动物生活在海底。 Mark Newman/The Image Bank/GettyImages Sea creatures abalone amphipod anemone barnacle barrier reef cowrie crab cray crayfish crustacean lobster marron mollusc mussel octopus shipworm shrimp snow crab soft-shell clam squid Examples of echinodermechinoderm Constituents also include grains present in any platform or basin environment, such as echinoderm fragments and diverse lithoclasts. Exceptions there are, notably with the echinoderms and some vertebrates, but these are rather brief and the great wealth of palaeontological data is largely overlooked. The mollusc and echinoderm debris are common and ubiquitous along the clinoform. Medium-grained sandstones (protoquartzite) contain quite well-rounded quartz grains, quartzite lithoclasts, muscovite, plagioclase (rare) and bioclasts, especially echinoderm plates, cemented by calcite spar. Major events in the evolution of echinoderms viewed by the light of embryology. Another block includes shell fragments, echinoderm plates, thin-walled bivalves, iron-oxide-rich pellets, polyzoan fragments and small geopetals. On the morphology of the mitotic apparatus isolated from echinoderm eggs. Our results indicate that though post-fertilisation peroxidase release is similar in echinoderms and amphibians, it has quite opposite effects. In the echinoderms, peptides released from the jelly coat of eggs play a pivotal role as a signal for such changes. The time to reach the peak is very short in echinoderms (0.4 s) but very long in mammals (10-30 min). The more abundant skeletal grains (up to 15 % of the components) are echinoderms, bivalves and lituolids. The identification of these two distinct body wall regions permitted the establishment of new homologies pertaining to all echinoderms. Brachiopods are the volumetrically dominant component of the communities, whereas ostracodes, trilobites, echinoderms and conodonts are of much less importance. 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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