Light (A, B) and scanning electron (C-I) micrographs of Cyphoderia amphoralis. (A) View of many specimens to illustrate variability in shape and size of the shell. (B) View of live specimen showing numerous granules, filling the cytoplasm and thin filopodia. (C, D) Lateral view of two specimens to show general shape and regular arrangement of shell-plates. (E, F) Latero-apertural views. (G) Lateral view of apertural region showing characteristic imbricated shell-plates and thin collar of organic cement around aperture. (H) Close up view of aperture to illustrate its broadly oval shape and arrangement of apertural-plates. (I) Detail of shell surface to show regular arrangement of overlapping shell-plates.