Valves dorsiventral with strongly arched dorsal margin
Valves up to 49 µm long
Maximum length to width ratio 4.3
Striae 12-17 in 10 µm
Stigmoid at median dorsal stria
Valves are dorsiventral, up to 49 µm long with a strongly arched dorsal margin. The maximum length to width ratio is 4.3. Striae number 12-17 in 10 µm. A single stigmoid lies at the end of the median dorsal stria.