Cells are boat-shaped with a central raphe and central nodulus dividing the raphe into two parts. The cells are colonial and occur as stacks with valves facing each other, but not attaching closely.
Two plate-like chloroplasts each with a pyrenoid.
Size; 13-65 µm long (apical axis), 4-5 µm wide (transapical axis).
Distribution; Arctic and northern Norway
Gran, H.H. (1897). Protophyta: Diatomaceae, Silicoflagellata und Cilioflagellata. Den Norske Nordhavs Exped. 1876-1878 24: 1-36