Cell lineages from an agamete to the 7-cell stage were almost identical among species (bar 1).
The fully formed embryo consists of three types of cells: peripheral cells, one syncytial cell, and an axial cell, which contains two agametes (Figs.
The fully formed vermiform embryo of Conocyema polymorpha consists of 14 peripheral cells and one axial cell, which contains one or two agametes (Fig.