Light (A-C) and scanning electron (D-I) micrographs of Longinebela tubulosa. (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, E) Broad lateral view to show general shape and arrangement of shell-plates. (F) Apertural view. (G) Broad lateral view of apertural region. (H) Close up view of aperture to show aperture outline and thin apertural collar. (I) Detail of shell surface showing shape and arrangement of shell-plates.