Light (A, C) and scanning electron (B, D-I) micrographs of Plagiopyxis declivis. (A-C) View of several specimens to illustrate variability in shape and size of the shell. (D) Apertural view showing general shape. (E) Dorsal view (F, G) Lateral views. (H) Close up view of aperture showing its shape as a narrow slit and smooth apertural surface. (I) Detail of dorsal side of the shell to illustrate its rough surface, covered with pieces of quartz.