Stauroneis Subborealis Guide
Credit: Loren Bahls
  1. Valves linear in small specimens, lanceolate in large specimens
  2. Apices protracted and broadly rounded
  3. Proximal raphe ends curved, inflated
  4. Striae 17-20 in 10 µm
  5. Areolae 18-22 in 10 µm

The small specimens are linear, while large specimens are lanceolate; 46-142 µm in length. Apices are protracted and broadly rounded. Proximal raphe ends are curved and inflated. Striae are radiate throughout and number 17-20 in 10 µm. Areolae number 18-22 in 10 µm.