Stauroneis Acuta Guide
Credit: Loren Bahls
  1. Valves large, rhombic-lanceolate with a gibbous central region
  2. Pseudosepta present
  3. Proximal raphe ends straight, weakly expanded
  4. Stauros bow-tie shaped
  5. Striae strongly radiate

Stauroneis acuta has large rhombic-lanceolate valves with a gibbous central region, acutely rounded apices with pseudosepta, straight and weakly expanded proximal raphe ends, strongly radiate striae, and a large stauros shaped like a bow tie.