| Abstract: | In 1976 to 1981 Testacea were followed in the epilithion of the lotic stretch of running waters of different degrees of saprobity. 225 samples were processed altogether; 56 taxa and 1859 individuals were found in them. For the individual degrees of saprobity the index of species diversity (H') was calculated as well as the index of saprobity (S). Most taxa and individuals were found in the beta-mesosaprobic degree. The following may be considered characteristic species for the oligosaprobic degree: Centropyxis sylvatica and Cyphoderia ampulla. For the beta-mesosaprobic degree they are Centropyxis aculeata, Euglypha acanthophora and Trinema lineare. Other species cannot be considered to be realiable indicators. |
