| Summary: | The aims of the present study, which was part of our comprehensive investigation of rock grasslands of Hungary, were to explore the enchytraeid fauna of Sas-hegy Nature Conservation Area, and to get knowledge on some ecological cha¬racteristics of this family. Ten enchytraeid species of five genera were found during the investigations; one of them, Achaeta antefolliculata proved to be new to science. The fact that the species Fridericia maculatiformis and Fridericia tubulosa proved to be dominant in the opened rock grasslands of Hungary might lead to a conclusion that they are the most characteristics species of these kind of habitats. The investigations of rock grasslands of Sas-hegy and other Hungarian hills, e.g. Szent György Hill, Nagy Szénás Hill and Villányi Mountains, show that the enchytraeid fauna of these localities are affected by the actual status of microhabitats (organic matter content, soil moisture, plant covering).
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