The occurrence and significance of moss animals (Bryozoa) in the River Someg/Szamosr

Till now very few data has been repor-ted concerning the occurrence of bryozoans in the Someg. In the,,united " Someg Plumatella emarginata var. spongiosa (Krapelin, 1887) was found. Earlier data are not known about this species in Romania. It can be found almost on every stone of the bed covering 25-30 % of their surface along a 45 km long section of the river. Considering the occurrence and the distribution of colonies at the sampling sites of Someg-Odorhei, Jicau and S6lsig, it is supposed that they play an important role in the biological purification of this mesosaprobe water