Light (A, C) and scanning electron (B, D-I) micrographs of Centropyxis orbicularis. (A-B) View of several specimens to illustrate variability in shape and size of the shell. (C, D) Apertural view showing general shape and shell structure. (E) Dorsal view. (F) Lateral view. (G) Close up view of aperture to illustrate its oval or elliptical shape and smooth surface around the aperture. (H) Detail of smooth apertural surface. (I) Detail of dorsal side of the shell to illustrate its rough surface, covered mainly with flattish particles.