According to Whittaker’s five kingdom classification, the Chlorella and Chlamydomonas are kept along with Amoeba and Paramoecium under
According to Whittaker's five kingdom classification Kingdom Protista has brought together Chlamydomonas, Chlorella (earlier placed in algae within plants and both having cell walls) with Paramoecium and Amoeba (which were earlier placed in the animal kingdom which lack cell wall).