Diploneis Finnica Guide Copy
Credit: Loren Bahls
  1. Valves large and broadly elliptical
  2. Central area small
  3. Striae biseriate
  4. Longitudinal canals broad

Diploneis finnica has large elliptical valves with biseriate striae and a small central area. The longitudinal canals are wide and lanceolate, 1/3 to 1/2 the width of the valve at the center.