Diatoms of North AmericaDiatoms of North America
Return to overview

Guide to Aulacoseira alpigena

(Grunow) Krammer 1991

A Alpigena Guide
Credit: Marina Potapova
  1. Ratio of mantle height to valve diameter < 1
  2. Rows of mantle areolae curve to the right
  3. Valve face flat
  4. Valve face with marginal areolae
  5. Spines located at the end of each pervalvar costa

Valves are 4-15 µm in diameter, mantle height is 4-7 µm. The ratio of the mantle height to valve diameter is less than 1. The rows of mantle areolae are curved to the right. The valve face is flat with one row of marginal areolae. Spines are positioned at the end of each pervalvar costa.