Light (A) and scanning electron (B-I) micrographs of Centropyxis ecornis. (A, B) View of several specimens to illustrate variability in shape and size of the shell. (C, D) Apertural view of two specimens showing general shape and shell structure. (E) Dorsal view. (F) Lateral view. (G) Close up view of aperture to show its irregular outline. (H) Detail of smooth apertural surface. (I) Detail of dorsal side of the shell to illustrate its rough surface, covered with sand grains.