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Description of Postgaardi mariagerensisFixed cells examined in detail by light microscopy were 16-25 microns long (n = 15) and oval shaped with somewhat pointed ends. Two thick flagella, each about 2.5 times the length of the cell body insert in a large anterior depression. The cell is covered by longitudinally arranged rod-shaped epibiotic bacteria. In fixed material some of these bacteria can be seen peeling off from the flagellate. The nucleus is positioned somewhat anterior to the middle of the cell. The nuclear material has a lumpy appearance when viewed with Nomarski optics, suggestive of condensed chromatin. There is a prominent central nucleolus.