Drawing

Description:

Ploeotia corrugata Larsen and Patterson, 1990. Cells are 8 to 20 microns long (mostly 13 to 15 microns) and 6 to 12 microns wide. Cell outline is elliptical to rhomboid. The cells are dorsally convex and ventrally flattened. There are seven ridges on the dorsal side: two of which appear as a marginal rim. The right half of the cell is slightly thicker than the left, with a slight ridge down the middle of the ventral side against which the recurrent flagellum lies. The posterior end of the cell is indented. With two flagella of unequal length, the anterior flagellum is about the same length as the cell, beats rapidly from side to side with an irregular wave motion when the cell glides. The posterior flagellum is about 1.5 to 2.2 times the length of the cell and tapers slightly towards the posterior end of the cell. The reservoir is on the left ventral side of the cell and the hook-shaped ingestion organelle with two rods extends from the right anterior of cell to the left posterior. The cells move by smooth gliding.