asexually; by binary fission.
step1: micronucleus divides by meiosis
step2: micronucleus divides, has 4 cells, each cell with haploid chromosome number
step3: 3 micronuclei will disintegrate, remaining will divide through mitosis-then has 2 micronuclei each haploid
step4:2 paramecia join at oral groove and exchange a micronucleus--2 micronuclei join and macronucleus disintegrates and new micro forms from macro