(embryol) the opening of the archenteron in the gastrula that develops into the anus of some animals
a blastula, especially a blastocyst. Historical Examples The Whence and the Whither of Man John Mason Tyler The Whence and the Whither of Man John Mason Tyler The Works of Francis Maitland Balfour, Volume II (of 4) Francis Maitland Balfour The Biological Problem of To-day Oscar Hertwig The Works of Francis Maitland Balfour, Volume II […]
a fungal spore that arises by budding. noun (botany) a spore formed by budding, as in certain fungi
the central rodlike portion of a gonangium, upon which buds that develop into medusae are formed.
the early developmental stage of an animal, following the morula stage and consisting of a single, spherical layer of cells enclosing a hollow, central cavity. Historical Examples The Riddle of the Universe at the close of the nineteenth century Ernst Haeckel The World’s Greatest Books – Volume 15 – Science Various The Science and Philosophy […]