Paracatenula porostriata Luthfi, Witkowski & M.Rybak, sp. nov. A–N light micrographs O–U SEM images of external valve view O, P external view of valves, unoccluded pores at one or both apices are present (white arrowhead, O) Q protracted apex of valve R pores on the valve mantle shown in the white arrowhead S, T cingulum perforated by biseriate striae externally at the dorsal side (black arrowheads) and one row of elongated pores internally at the ventral side (white arrowhead, S) U whole girdle view of frustule, with depressed areolae on valve mantle. Scale bar: 10 µm (A–N).