| 释义 |
‖ gastræa|gæˈstriːə|
[mod.L., f. Gr. γαστ(ε)ρ-, γαστήρ belly.]
1. = gastrula.
1877Huxley Anat. Inv. Anim. i. 50 In the Porifera the terminal aperture of the gastræa becomes the egestive opening of the adult animal.
2. A primitive sac-like animal, whose existence is assumed by Haeckel, consisting of two layers of cells, an ectoderm and an endoderm. gastræa theory, the theory which supposes this to have been the ancestral form of the whole animal kingdom.
1879tr. Haeckel's Evol. Man I. 9 A very ancient ancestral form is represented by the two-layered Gastræa. Ibid. 250 These are the principles of the unified or monophyletic genealogy of the animal kingdom, as they present themselves, provisionally, according to the Gastræa Theory. 1892Nation (N.Y.) 21 Apr. 309/2 The author is thoroughly permeated by the gastraea myth. |