Cytula

We have now secured a number of firm standing-places in the labyrinthian course of our individual development by our study of the important embryonic forms which we have called the cytula, morula, blastula, gastrula, coelomula, and chordula. ❋ Ernst Heinrich Philipp August Haeckel (1876)

The ovum after the nucleus had been re-formed became the cytula, which was the ontogenetic counterpart of the amoeba. ❋ Unknown (N/A)

ARCHI -: (in compounds) the first or typical -- as, archi-cytula, archi-gastrula, etc. BIOGENY: the science of the genesis of life (bios). ❋ Ernst Heinrich Philipp August Haeckel (1876)

The stem-cell or cytula, formed by fecundation of the ovum, divides by repeated regular cleavage first into two (A), then four (B), then eight (C), and finally a large number of segmentation-cells (D). ❋ Ernst Heinrich Philipp August Haeckel (1876)

The amoeboid nature of the young ovum and the unicellular condition in which (as stem-cell or cytula) every human being begins its existence justify us in affirming that the earliest ancestors of the human race were simple amoeboid coils. ❋ Ernst Heinrich Philipp August Haeckel (1876)

* (* The plasson of the stem-cell or cytula may, from the anatomical point of view, be regarded as homogeneous and structureless, like that of the monera. ❋ Ernst Heinrich Philipp August Haeckel (1876)

Stem-cell of one of the echinoderms (cytula, or "first segmentation-cell" = fertilised ovum), after Hertwig. k is the nucleus or caryon.) ❋ Ernst Heinrich Philipp August Haeckel (1876)

A first cleavage of the stem-cell (cytula), B division of same into four segmentation-cells (only two visible), C the germinal disk divides into the blastoderm (b) and the periblast (p). d nutritive yelk, f fat-globule, c ovolemma, z space between the ovolemma and the ovum, filled with a clear fluid.) ❋ Ernst Heinrich Philipp August Haeckel (1876)