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New Stands of Species of the Paramecium aurelia Complex; is the Occurrence of Particular Species Limited by Temperature Barriers?

The occurrence of ciliates, especially the Paramecium aurelia complex, has not yet been studied in many parts of the world, or sampling was done only occasionally. Generally, the southern hemisphere still awaits investigation. In North America only the USA was studied in greater detail; the majority of species of the complex were there recorded. In Asia, more frequent sampling was performed only in Japan and Asiatic Russia. Europe was studied more carefully, however, a different number of habitats was studied in particular zones of Europe, the least in the southern zone. New stands of P. tetraurelia , P. sexaurelia, P. octaurelia, and P. novaurelia were revealed as a result of the present investigations carried out in Africa (Mozambique--P. tetraurelia, P. sexaurelia), Asia (Indonesia--P. sexaurelia), borderland of Asia and Europe (Georgia--P. octaurelia), and Europe (Macedonia--P. tetraurelia and Romania--P. novaurelia). Are climatic zones the main factor limiting the occurrence of species of the P. aurelia complex? Analysis of data on the distribution of the P. aurelia species complex in warm "tropical" zones on different continents may suggest such preferences for some species, including P. sexaurelia, P. octaurelia, P. tredecaurelia, P. quadecaurelia. The first two of these species were recorded herein in warm or "tropical" zone.