Acineta (ass-in-eat-a) is one of the more common suctoria - a very unusual type of ciliate. Suctoria lack cilia in the trophic form, - and you can only tell that they are ciliates when they divide and produce small ciliated cells. Suctoria are distinguished by having arms with expanded tips. Each of these is a mouth and used to capture food. Acineta cells are enclosed in a lorica with a stalk. The large homogeneous structure in the cell is the macronucleus. Differential interference contrast.