Diatoms of North AmericaDiatoms of North America
Return to overview

Guide to Aulacoseira herzogii

(Lemmerm.) Simonsen 1979

Aulacoseira Herzogii Guide
Credit: Jonathan English, Marina Potapova
  1. Ratio of mantle height to valve diameter >= 1
  2. Valves with 2(4) long spines
  3. Mantle areolae hardly visible in LM
  4. Rows of mantle areolae straight
  5. Ringleiste shallow

The ratio of mantle height to valve diameter is either equal to, or greater than, 1. On the valve mantle, two diametrically opposed grooves containing no areolae extend the entire length of the valve and two large, pointed separation spines diametrically opposed on the valve face extend in the plane of the mantle onto grooves of the neighboring valves. Mantle reolae may not be visible in LM. Valves lack linking spines. The ringleiste is solid and relatively shallow.