“Acellular” designation for organisms

“Acellular” designation for organisms

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Why do some biologists refer to single-celled organisms such as Amoeba and Paramecium as acellular (i.e., without cells) rather than unicellular (i.e., one cell)?

From Wikipedia:

Some biologists refer to wholly syncytial organisms as "acellular" because their bodies contain multiple nuclei which are not separated by cell walls.

As Albano pointed out, "cell walls" should probably be "cell membranes".

Paramecium and some types of amoeba like the Chaos genus have multiple nuclei so they fall under this definition.