Light (A, C) and scanning electron (B, D-I) micrographs of Longinebela speciosa. (A, B) View of many specimens to illustrate variability in shape and size of the shell. (C) View of live specimen showing granular cytoplasm, pseudopodia and epipodes. (D) Broad lateral view showing general shape and arrangement of shell-plates. (E) Lateral view. (F) Apertural view. (G) Narrow lateral view of apertural region to show laterally concave aperture. (H) Broad lateral view of apertural region. (I) Close up view of aperture showing aperture outline and collar of organic cement.