Frustulia Asiatica Guide
Credit: Carrie Graeff
  1. Longitudinal ribs incomplete at the valve center
  2. Valves linear-lanceolate
  3. Central area oval

Unlike most species of Frustulia, F. asiatica has longitudinal ribs that are incomplete at the valve center. The valves are linear-lanceolate and not at all rhomboid like other Frustulia taxa, but linear-lanceolate in shape. The central area is oval.