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Guide to Surirella iowensis

R.L.Lowe 1973

Surirella Iowensis Guide
Credit: Jonathan English, Marina Potapova
  1. Keel low, alar wings absent
  2. Valves heteropolar
  3. Valves slightly twisted about the apical axis
  4. Valves 21-54 μm long, 15-33 μm wide
  5. Fibulae 6-8 in 10 μm

Valves are heteropolar, with a broadly rounded headpole and a cuneately rounded footpole in the larger valves and a broadly rounded footpole in the smaller valves. The valve face is slightly concentrically undulate and twisted about the apical axis. Fibulae are 6-8 in 10 μm and costae are 16-26 in 10 μm.