The first stage of the division of Lecythium granulatus is as one may expect: the nucleus divides into two nuclei. The cleavage furrow indicates the splitting of the membrane. During division the cell keeps moving by means of it filopodia.

The splitting of the membrane lasts for more than an hour. The daughter cell doesn’t have a pseudostome in this stage.

Though obscured by a diatom, there was suddenly a pseudostome in the daughter cell through which filopodia emerged.

This cell seems to be dividing; both specimens have their own nucleus, but they are still connected to each other in the apertural region.