nMonerula(Biol) A germ in that stage of development in which its form is simply that of a non-nucleated mass of protoplasm. It precedes the one-celled germ. So called from its likeness to a moner.
Century Dictionary and Cyclopedia
nmonerulaIn embryology, a name given by Haeckel to a supposed non-nucleated stage of an impregnated ovum, when it has the form-value of a simple cytode, or moner. It is supposed that the nucleated ovum, immediately upon fecundation by spermatozoa, undergoes retrogressive metamorphosis, loses its nucleus, and becomes a mere mass of protoplasm; that then a new nucleus is formed, in the formation of which the spermatic protoplasm takes part; and that thereupon the ovum resumes its form-value of a nucleated cell as a cytula, having been a monerula in the interval between the loss of the original nucleus and the acquisition of the new one. The word is one of a series, other members of which are cytula, morula, blastula, and gastrula.