A–F Encyonopsis indonesica sp. nov. (SEM). External view A central area B, C valve ends. Note a hyaline area along the raised sternum D a part of a raphe with transapical ribs on the valve surface E, F valve ends with strongly hooked distal raphe fissures. Scale bars: 1 µm (A, C, D, E), 2 µm (B), 0.5 µm (F).