Stauroneis Americana Guide
Credit: Loren Bahls
  1. Valves large
  2. Pseudosepta present
  3. Proximal raphe ends straight
  4. Stauros rectangular
  5. Striae slightly radiate

Stauroneis finlandia, S. javanica, S. kishinena and S.ursamaioris have proximal raphe ends that are strongly curved and expanded. Stauroneis finlandia and S. ursamaioris have distinctly protracted valve apices.