Surirella Atomus Guide
Credit: Jonathan English
  1. Keel low, alar wings absent
  2. Valves small
  3. Valves heteropolar
  4. Fibulae broad and short
  5. Costae and central line not visible in LM

Valves are small and heteropolar, 8-19 μm long by 5-8 μm wide. Headpole is broadly rounded and foopole is cuneately rounded. Fibulae are broad and short, 8-10 in 10 μm. Costae and center line are not visible in the LM.