Diprora haenaensis

Valves are linear with broad, rounded ends. The smallest valves are nearly circular. The sternum is broad and a single row of simple marginal pores is present. The pores are rimmed channels. In girdle view, frustules are rectangular. Frustules are joined together, forming filamentous chains. The valve face surfaces within a filament are alternately convex and concave and fit together convex surface to concave surface. Convex valves have pores that extend through the valve wall in a pervalvar direction. Concave valve pores extend in a transapical direction. The channels formed by these pores in the thick cell walls are notable in light microscopy and their orientation varies depending on a concave or convex valve surface. In girdle view, the mantle is extended at the apices to form prows. Within a frustule, the prows of the epivalve overlap the prows of the hypovalve (SEM). Cingula are incomplete and consist of segments that extend on one side of each valve between the prows. Only the epicingulum is visible in intact frustules. In prepared slides, many epicingula are lost. Post-auxospore valves are expanded centrally. Some valves have thick walls and broadened outlines; these valves are presumed to be resting cells.

Diprora haenaensis has two parietal plastids in each cell. Living cells are joined colonies of 15-20 cells.