Pelobiont

The pelobionts are a small group of amoebae that lack mitochondria. The most notable member is Pelomyxa, called giant amoebae because they reach sizes of up to 3 mm. They also include the flagellated amoebae Mastigamoeba , Mastigella , and Mastigina . Both pelobionts and the closely related entamoebae lack mitochondria and dictyosomes, now known to be a secondary absence. They are now included in the phylum Amoebozoa.