deuterostome
Americannoun
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Embryology. a mouth that develops separately from the blastopore.
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Taxonomy. any member of the phyla (Chordata, Hemichordata, Echinodermata, Chaetognatha) in which the anus appears first, developing at or near the blastopore, cleavage is radial and indeterminate, and the mesoderm and coelom form from outgrowths of the primitive gut.
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Any of a major group of animals defined by its embryonic development, in which the first opening in the embryo becomes the anus. At this stage in their development, the later specialized function of any given embryonic cell has not yet been determined. Deuterostomes are one of the two groups of animals that have true body cavities (coeloms), and are believed to share a common ancestor. They include the echinoderms, chaetognaths, hemichordates, and chordates.
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Compare protostome
Etymology
Origin of deuterostome
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Example Sentences
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But strangely, the new deuterostome fossils seem to have no anus, presumably using the mouth for evacuation.
From New York Times ● Jan. 30, 2017
Green boxes around the names indicate genes with pan-metazoan/bilaterian ancestry and without accelerated sequence change in the deuterostome lineage.
From Nature ● Nov. 17, 2015
Since extant invertebrate deuterostomes use this apparatus for efficient suspension and/or deposit feeding, the early Cambrian or Precambrian deuterostome ancestor probably also shared this lifestyle.
From Nature ● Nov. 17, 2015
The body plan of the deuterostome at this stage looks very similar to that of the protostome, but the blastopore becomes the anus, and the second opening becomes the mouth.
From Textbooks ● Jan. 1, 2015
As the deuterostome develops, the mesoderm pinches off and fuses, forming a second body cavity.
From Textbooks ● Jan. 1, 2015
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