INTRACELLULAR PARASITES OF UNKNOWN TAXONOMIC POSITION IN GILLS OF COMMON CARP CYPRINUS-CARPIO

In the gill filaments of common carp Cyprinus carpio fingerlings heavi ly infected with Sphaerospora molnari, intracellular parasites of unkn own taxonomic position were detected with TEM. Cells, up to 3.5 mum in size, displayed surface projections which were often microvillous in shape. One or more nuclei often in diplokaryon arrangement were seen i n sectioned cells. Except for numerous dense bodies, no cytoplasmic or ganelles were observed. The possible relation to amphizoic amoebae, ha plosporidia, microsporidia and myxosporean stages is discussed; these parasites could not be identified with any of the them.