Light (A, C) and scanning electron (B, D-I) micrographs of Zivkovicia spectabilis. (A, B) View of many specimens to illustrate variability in shape and size of the shell. (C) View of live specimen showing long endolobopodia. (D, E) Lateral view of two individuals to show a general shape. (F) Apertural view. (G) Close up view of internal openings. (H) Portion of shell to show arrangement of quartz particles and rough surface. (I) Detail of organic cement network.