infusorian

This has been shown by the careful experiments of Maupas, who had observed 215 generations of an infusorian without sexual union.

The Infusorian can be called potentially immortal, because of this method of reproduction.

In fact, the infusorian simply swallows whatever happens to hit his mouth.

Now the single-celled Infusorian is in many respects comparable with the single-celled germ of the higher animals.