Aulacoseira Italica Guide
Credit: Marina Potapova
  1. Rows of mantle areolae inclined to the left, or almost straight
  2. Linking spines large and broadly spatulate
  3. Mantle areolae "slit-shaped"
  4. Valve diameter 4-24 µm, mantle height 9-20 µm
  5. Ringleiste shallow, broad

The rows of slit-shaped mantle areolae are curved to the left or almost straight (parallel to pervalvar axis). The linking spines are large and spatulate, or anvil-shaped. The valve diameter is 4-24 µm and the mantle height is 9-20 µm. The ringleiste is thick and shallow.