Light (A, B) and scanning electron (C-I) micrographs of Padaungiella nebeloides. (A, B) View of many specimens to illustrate variability in shape and size of the shell. (C, D) Broad lateral view of two individuals showing general shape. (E) Apertural view. (F) Broad lateral view of apertural region showing a thick collar of organic cement and uneven, undulating rim. (G) Close up view of aperture to show its irregular outline. (H) Detail of shell surface showing shape and arrangement of shell-plates. (I) Detail of shell surface to illustrate small pores in the organic cement.