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Guide to Surirella amphioxys

W.Sm. 1856

Surirella Amphioxys Guide
Credit: Jonathan English, Marina Potapova
  1. Keel low, alar wings absent
  2. Valves isopolar
  3. Valve face with undulations
  4. Striae 16-20 in 10 µm
  5. Valves 28-48 µm long, by 13.5-17 µm wide

Valves are 28-48 µm long by 13.5-17 µm wide, isopolar with cuneate apices. The valve face has undulations, or porcae, that appear as rectangles in the LM. Striae are 16-20 in 10 µm.