Light (A, C) and scanning electron (B, D-I) micrographs of Difflugia lanceolata. (A, B) View of many specimens to illustrate variability in shape and size of the shell. (C) View of live specimen to illustrate a single long endolobopodia. (D-F) View of three specimens to show variability of shell shape. (G) Apertural view showing aperture outline and thin organic collar. (H) Portion of shell to show arrangement of siliceous particles to give a smooth surface. (I) Detail of organic cement network.