'acinetae' originates from Greek, specifically the word 'akinetos,' where 'a-' meant 'not' and 'kinein' meant 'to move.'

'akinetos' transformed into the Latin word 'acinetae,' and eventually became the modern scientific term 'acinetae.'

Initially, it meant 'immobile,' but over time it evolved into its current meaning of 'a genus of sessile protozoans.'