Definitions

from The Century Dictionary and Cyclopedia

  • n. In embryology, that form of metagastrula (which see) which results from unequal cleavage or segmentation of the vitellus (yolk).

Etymologies

Sorry, no etymologies found.

Examples

  • 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

  • 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

  • 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

  • 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

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