Definitions
from The Century Dictionary.
- noun In embryology, that form of metagastrula (which see) which results from unequal cleavage or segmentation of the vitellus (yolk).
Etymologies
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Examples
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Nevertheless, it is not difficult to reduce the whole cenogenetic or disturbed development of this amphigastrula to the true palingenetic formation of the archigastrula of the amphioxus.
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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The latter has developed from the amphigastrula of the ganoids and dipneusts, whereas the discoid amniote gastrula has been evolved from the amphibian gastrula by the addition of food-yelk.
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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As the gastrulation proceeds a large spherical blastula is formed from this peculiar solid amphigastrula of the placental, as we saw in the case of the marsupial.
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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Essentially different from the wide-mouthed discoid gastrula of most of the selachii is the narrow-mouthed discoid gastrula (or epigastrula) of the amniotes, the reptiles, birds, and monotremes; between the two -- as an intermediate stage -- we have the amphigastrula of the amphibia.
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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