 The change in pigment of the plastids is due to photoactivity, the change of low light to high light causes the plastids to turn green when there is no prey.The cryptophyte nucleomorph found in "M. rubrum" is lost in "D. caudata".The final plastids of "D. caudata" appeared stellate and had clustered pyrenoids terminally positioned, their thylakoid membranes are placed in pairs.