Light (A, C) and scanning electron (B, D-I) micrographs of Centropyxis plagiostoma. (A, B) View of several specimens to illustrate variability in shape and size of the shell. (C-E) Apertural view of three specimens showing general shape and shell structure. (F) Dorsal view. (G) Lateral view. (H) Close up view of aperture to illustrate its denticulate shape. (I) Detail of dorsal side of the shell to illustrate its rough surface, covered with pieces of quartz.