EN
Two strains from Russia, one collected in Stary Peterhof, St. Petersburg and the second one in Irkutsk near Lake Baikal, both bearing two types of endosymbiont - Caedibacter sp. in the cytoplasm and Holospora caryophila in the macronucleus, were identified as Paramecium biaurelia. The strain originating from Hanoi, Vietnam was determined as Paramecium primaurelia, this strain has no endosymbionts.