Light (A, B) and scanning electron (C-I) micrographs of Padaungiella tubulata. (A-C) View of many specimens to illustrate variability in shape and size of the shell. (D, E) Broad lateral view of two individuals showing general shape and arrangement of shell-plates. (F) Lateral view. (G) Latero-apertural view. (H) Broad lateral view of apertural region showing a thin collar of organic cement and convex border of the aperture. (I) Detail of shell surface showing shape and arrangement of shell-plates.