Light (A, B) and scanning electron (C-I) micrographs of Cyclopyxis eurystoma. (A-C) View of many specimens to illustrate variability in shape and size of the shell. (D) Apertural view showing general shape. (E) Dorsal view. (F) Lateral view. (G) Close up view of aperture. (H) Close up view of smooth apertural surface. (I) Detail of aboral side of the shell to illustrate its rough surface, covered with large pieces of quartz.