morula-stage

Updated: May 1, 2025

As Hatschek afterwards found , the segmentation-cells only remain equal up to the morula-stage, the spherical body of which consists of thirty-two cells. Then, as always happens in unequal segmentation, the more sluggish vegetal cells are outstripped in the cleavage.

Ernst Heinrich Philipp August Haeckel - The Evolution of Man — Volume 2