Light (A, B) and scanning electron (C-I) micrographs of Difflugia hiraethogii. (A, B) View of several specimens to illustrate variability in shape and size of the shell. (C, D) Broad lateral view of two individuals illustrating pyriform shape and distinct short neck. (E) Lateral view to show compression of the shell. (F) Apertural view (G) Close up view of aperture showing its irregular outline and surrounding angular particles of quartz. (H) Portion of shell to show arrangement of flattish particles to give a smooth surface. (I) Detail of organic cement network.