Eunotia Bactriana Guide
Credit: Ian Bishop
  1. Dorsal margin with two pointed undulations
  2. Ventral margin concave
  3. Apices dorsally recurved, capitate
  4. Striae evenly spaced

The dorsal margin is convex and contains two prominent, pointed, widely-set undulations. The ventral margin is concave, becoming more linear in smaller specimens. Apices are capitate and dorsally recurved. Striae are evenly spaced through most of the valve, becoming slightly more dense at the apices.