1. multicellular animals having cells differentiated into tissues and organs and usually a digestive cavity and nervous system
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How To Use Metazoa In A Sentence

  • The typical embryonic form of the metazoa, as it is presented for a time by this simple structure of the two-layered body, is called the gastrula; it is to be conceived as the hereditary reproduction of some primitive common ancestor of the metazoa, which we call the gastraea. The Evolution of Man — Volume 1
  • To understand the origins of complexity in metazoan body plans, then, we must find where these tissues came from; that is, how epithelia and mesenchyme arose.
  • On the basis of this information it has been proposed that the earliest metazoans were probably wormlike organisms, similar to the larvae of modern cnidarians and developed from flagellate protists.
  • One widely-mooted suggestion is that planktotrophic larvae, typified by the annelidan trochophore and echinoid pluteus, existed long before the metazoan radiations evident in the Cambrian fossil record.
  • Surprisingly complex T-box gene complement in diploblastic metazoans As Expected
  • The ancestral metazoan gene structure gives the most parsimonious derivation of its descendant genes.
  • These genetic techniques will clarify the evolutionary and phylogenetic importance of segmentation in metazoan evolution.
  • The ovum is now what has been called a gastrula; and it is of importance to observe that probably all the Metazoa pass through this stage. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions
  • Fossils of the Twitya Formation are generally presumed to be cnidarians, or at least metazoans of cnidarian grade.
  • They are just the simplest, barest kind of metazoan we can find now. Mysterious Trichoplax - The Panda's Thumb
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