Definitions
from The Century Dictionary.
- noun The archenteron, or gastrocœle of an embryo in the gastrula stage.
- noun In entomology, the anterior edge of the abdomen: a term used by acarologists.
Etymologies
Sorry, no etymologies found.
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Examples
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In this form, he says, the progaster is already developed, and its wall is differentiated for the first time into an animal or dermal layer (ectoblast), and into a vegetative or intestinal layer (hypoblast).
The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality Rudolf Schmid
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The cavity which is produced in the foetus by this curving is, in each case, the primitive gut (progaster), and its opening the primitive mouth (prostoma).
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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This is the primitive gut-cavity or the gastric cavity of the gastrula, progaster or archenteron.
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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The first and oldest organ of all these metazoa is the primitive gut (or progaster) and its opening, the primitive mouth
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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As in all the other animals that form an archigastrula, the whole body is nothing but a simple gastric sac or stomach; its internal cavity is the primitive gut (progaster or archenteron, Figure 1.38 g, 1.35 d), and its aperture the primitive mouth (prostoma or blastoporus, o).
The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876
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I give the name of primitive gut (progaster) and primitive mouth
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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In this intermediate stage there are two cavities in the embryo -- the original cavity (blastocoel) which is disappearing, and the primitive gut-cavity (progaster) which is forming.
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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