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Guide to Meridion circulare var. constrictum

(Ralfs) Brun 1880

Meridion Circulare Var Con Guide
Credit: Natalie Hoidal
  1. Valves linear-clavate
  2. Headpole distinctly rostrate
  3. Costae present
  4. Sternum narrow
  5. Single rimoportula

Valves are clavate, with a rostrate headpole. Costae extend transversely across the valve. A single rimoportula is present near the headpole. The sternum is narrow.