Light (A, B) and scanning electron (C-I) micrographs of Longinebela golemanskyi. (A-D) Broad lateral view to illustrate general shape and characteristic voluminous siliceous shell-plates. (E) Latero-apertural view. (F) Apertural view. (G) Close up view of aperture showing aperture outline and collar of organic cement. (H) Lateral view of apertural region. (I) Detail of shell surface showing shape and arrangement of shell-plates.