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In the zygote resulting from pairing two nuclei soon fuse into one; but this again divides into two; an embryonic shell is secreted, and this is the microspheric type, which is multinuclear from the first.

The multinuclear body generally assumes a definite shape, often that of a sausage.

How the creature does this is unknown, but Mark Fricker of Oxford University, who is one of Dr Tero’s colleagues, speculates that the forces generated by protoplasm pulsating back-and-forth through the multinuclear cell are interpreted and used to determine which routes to reinforce, and which connections to trim.

The cells are single but multinuclear.

It was formerly taught that the plasmodium is unicellular, but more recent investigation has shown that the plasmodial protoplasm is not only multinuclear but karyokinetic; its cells divide and redivide, as do the reproductive cells of plants and animals generally.