A genus of single-celled protozoan organisms (ciliates) that lacks cilia in its adult form, often parasitic on other protozoans.
From Greek 'a-' (without) plus 'kinetos' (moving). The name reflects that adult acinetas are stationary, lacking the motion-providing cilia of related organisms.
Acinetas are parasites that attack other microscopic creatures—discovering them required inventing a word to describe something 'without motion,' which is philosophically backward since their hosts are also usually immobile!
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