(rah-fid-ee-off-riss) is a centrohelid heliozoon. Like other centrohelids, it has thin untapering arms, which have prominent extrusomes. The arms are supported by microtubular axonemes which terminate on a central granule (centroplast) which can just about be seen here. Distinguished from other genera because the cell is enclosed in a layer of loosely adhering boat-shaped scales with thickened margins. Differential interference contrast.