Studies on the distribution of the Paramecium aurelia species complex of Poland

Species of the Paramecium aurelia complex occurred in the studied regions of the Carpathians and the Sudetes Mts with varying frequency. P. novaurelia appeared most often, P. biaurelia occurred less frequently but was also very characteristic, both species prevailed over P. primaurelia. P. tetraurelia and P. triaurelia were very rare.