Diatoms of North AmericaDiatoms of North America
Return to overview

Guide to Aulacoseira granulata

(Ehrenb.) Simonsen 1979

Aulacoseira Granulata Guide
Credit: Marina Potapova
  1. Mantle height : Valve diameter > 0.8
  2. Separation valves with 1-2 long spines
  3. Mantle areolae square
  4. Rows of areolae on separation valves straight
  5. Rows of areolae on linking valves curved to right

The ratio of the mantle height to valve diameter is usually greater than 0.8, but lower than 5. The mantle areolae are square. Rows of areolae on the mantle are curved to the right (dextrorse), but are nearly straight and parallel to pervalvar axis in separation valves.