Light (A, C) and scanning electron (B, D-I) micrographs of Difflugia pyriformis. (A, B) View of many specimens to illustrate variability in shape and size of the shell. (C) View of live specimen to illustrate a single long endolobopodia and granular cytoplasm with symbiotic zoochlorelae. (D, E) Lateral views of two individuals to show general shape. (F) Apertural view. (G) Close up view of aperture showing its circular outline and surrounding small particles of quartz. (H) Portion of shell to show arrangement of particles and rough surface of the shell. (I) Detail of organic cement network.