Light (A, B) and scanning electron (C-I) micrographs of Centropyxis constricta. (A-C) View of many specimens to illustrate variability in shape and size of the shell. (D) Apertural view to illustrate general shape and shell structure. (E) Latero-apertural view. (F) Latero-dorsal view. (G) Close up view of aperture to show its oval shape and smooth surface around the aperture. (H) Detail of apertural side showing its smooth surface. (I) Detail of dorsal side to illustrate its rough surface, covered with small to medium sand grains.