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Updated: May 1, 2025
All our later ancestors are complex organisms, or individualities of a higher order social aggregations of a plurality of cells. The earliest of these, the Moraeada, which represent the third stage in our genealogy, are very simple associations of homogeneous, indifferent cells undifferentiated colonies of social Amoebae or Infusoria.
They belong to various groups both of the Protophyta and Protozoa. To have some idea of those ancestors of our race that succeeded phylogenetically to the Moraeada, we have only to follow the further embryonic development of the morula. In this way the solid mulberry-embryo becomes a hollow sphere, the wall of which is composed of a single layer of cells.
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