Peritromus (pair-ee-trome-us) is a flattened heterotrich ciliate with an extensive adoral zone of membranelles curving around the anterior lateral margin of the cell to the cytostome (mouth) located about midway down the cell and on the ventral side. With two large dark macronuclei. Slightly contractile. Eats diatoms, other algae, detritus. Phase contrast.
