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Description of Carpediemonas membraniferaCells are elliptical or obovate and 3 to 6 microns long with a longitudinal ventral groove, which extends most of cell length. When squashed, the cell is pliable. Two flagella unequal in length emerge from the anterior distal part of the cell; the anterior flagellum bent over backwards is as long as the cell and beats stiffly. The acronematic posterior flagellum is about 2.5 - 4 times cell length, beats actively in the ventral depression and usually lies in the depression. The cells usually move by skidding with the anterior flagellum beating with a stiff paddling motion. The cells consume bacteria.