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Guide to Aulacoseira nygaardii

(Camburn) Camburn and Charles 2000

Aulacoseira Nygaardii Guide
Credit: Marina Potapova
  1. Ratio of mantle height to valve diameter close to or < 1
  2. Rows of mantle areolae straight
  3. Valve face appears slightly convex
  4. Valve face with short radial striae at the periphery
  5. Spines originate from every second or third costa

Valves are 5-11 µm in diameter, with a mantle height of 4-19 µm. The ratio of the mantle height to valve diameter is close to 1. The valve face appears slightly convex in LM. Rows of pervalvar areolae are straight, 22-31 in 10 µm, with 30-42 areolae in 10 μm. The valve face is plain with short radial striae at the periphery. The spines are anchor-shaped, narrow, and originate from every second or third costa. The ringleiste is shallow and bell-shaped in cross-section.

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