† paragastrulan.
Zoology. Obsolete. rare.
A stage in the development of the larva of certain calcareous sponges, formed by invagination of the amphiblastula.
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perigastrula1876
gastraea1877
gastrula1877
paragastrula1887
1887 W. J. Sollas in Encycl. Brit. XXII. 425/1 The two-layered sac thus produced is a paragastrula; its outer layer, known as the epiblast, gives rise to the ectoderm, the inner layer or hypoblast to the endoderm.
Derivatives
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the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > [adjective] > gastrula
paragastrular1890
pregastrular1894
1890 Cent. Dict. 4275/3 Paragastrular, of or pertaining to a paragastrula; having the character of a paragastrula.
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the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > [noun] > gastrula, etc. > formation of
gastrulation1879
paragastrulation1890
1890 Cent. Dict. 4275/3 Paragastrulation, the formation of a paragastrula by invagination of an amphiblastula.
This entry has been updated (OED Third Edition, June 2005; most recently modified version published online June 2021).
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n.1887