Navicula Sovereinii Guide
Credit: Loren Bahls
  1. Proximal raphe ends bulbous and laterally expanded
  2. Vermiform markings on axial and central areas
  3. Central area round
  4. Terminal striae straight

Navicula sovereignii has bulbous, laterally expanded proximal raphe ends, "worm-like" markings on the axial and central areas, a round central area, and straight terminal striae.