Valves dorsiventral, with flat to slightly tumid ventral margins
Valves < 9 µm wide
Maximum L:W of 5.7
Striae 8-13 in 10 µm
Ventral striae short
Valves are dorsiventral with flat to slightly tumid ventral margins. Valves are less than 9 µm wide with a maximum length to width ratio of 5.7. Striae number 8-13 in 10 µm. The ventral striae are short.