Paraphysomonas butcheri Pennick and Clarke, 1972. As for all Paraphysomonas species, the cell has one long and one short flagellum. The surface of the cell is covered with two types of scales. Plate scales are elliptical or occasionally circular, 0.4-0.7 x 0.3-0.45 microns, with numerous circular perforations. Crown scales have a proximal ring connected to a distal arched ring by a number of struts. Scale only is illustrated.