In my sampling sites Purren pond and Simmelried I find Metopus laminarius frequently and regularly. It is one of the largest species of the genus Metopus. Kahl gives a range of 200–260 µm for the body length and distinguishes a variety “minor” (s. right drawing above) with a length of about 150 µm. In my population I could find specimens with lengths between 170 – 320 µm. The body size seems to depend strongly on the number of food vacuoles in the body. Well fed specimens were larger. Therefore, in my opinion, the variety “minor” is not justified, since it is only a sign of nutritional status. As described by Kahl, the food vacuoles of Metopus laminarius are mainly filled with pink rhodobacteria (s. fig. 2b). The cytoplasm often appeared faintly yellowish. The anterior end is flattened and twisted in a spiral running in clockwise direction. The adoral zone follows this spiral and lowers ventrally into the mouth opening (s. fig. 3a). The long caudal cilia, described and drawn by Kahl, are hard to see. Only in one specimen I could document them (s. figs. 2 a and 2 c). In other specimens I sometimes could not see them at all. Possibly they are shed quickly. Metopus laminarius lacks a fringe of extrusomes under the pellicle, but it appears finely granulated (s. fig. 5).