Drawing

Description:

Petalomonas excavata Skuja, 1939. Cells oval and a little flattened. Left side strongly convex, right side less convex. Cells 30-35 x 22-25 microns, 16-18 microns thick with a large median dorsal groove. Flagellum about cell length or slightly longer. Cell surface smooth, and cytoplasma hyaline filled with grains. Nucleus below the center or a little to the left side. Moves with a rather slow gliding.