Definitions

from The Century Dictionary and Cyclopedia

  • n. In embryology, a disk-gastrula; that special form of metagastrula or kinogenetic gastrula which results from discoidal egg-cleavage, or discoidal segmentation of the vitellus.

Etymologies

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Examples

  • From the discogastrula of the former was evolved the distinctive epigastrula of the latter.

    The Evolution of Man — Volume 1

  • In contrast to the two chief forms of gastrula we considered previously, we give the name of discoid gastrula (discogastrula, Figure 1.54) to this third principal type.

    The Evolution of Man — Volume 1

  • Richard Semon in 1894, there could be little doubt, in view of the great size of their food-yelk, that their ovum-segmentation was discoid, and led to the formation of a sickle-mouthed discogastrula, as in the case of the reptiles and birds.

    The Evolution of Man — Volume 1

  • We shall return to this discogastrula in Chapter 1.9.

    The Evolution of Man — Volume 1

  • (From Duval.) ud primitive gut, vl, hl fore and hind lips of the primitive mouth; ak, ik outer and inner germinal layers; vr fore-border of the discogastrula.)

    The Evolution of Man — Volume 1

  • Discoid gastrula (discogastrula) of a bony fish. e ectoderm, i entoderm, w border-swelling or primitive mouth, n albuminous globule of the nutritive yelk, f fat-globule of same, c external membrane (ovolemma), d partition between entoderm and ectoderm (earlier the segmentation-cavity).)

    The Evolution of Man — Volume 1

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