Navicula Eidrigiana Guide
Credit: Loren Bahls
  1. Valves elliptic-lanceolate
  2. Valve apices narrowly rounded
  3. Central area variable, asymmetric
  4. Central striae irregularly spaced

Valves are lanceolate to elliptic-lanceolate with narrowly rounded apices. The central area is variable in size and shape, and is typically asymmetric. Striae are irregularly spaced around the central area. The proximal raphe ends are bent slightly to one side.