Diatoms of North AmericaDiatoms of North America
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Guide to Neidium amphigomphus

(Ehrenb.) Pfitzer emend. K.Lefebvre and P.B.Ham. 2015

Neidium amphigomphus guide2
  1. Apices cuneate
  2. Valve margins nearly parallel
  3. Areolae transapically expanded near valve margin
  4. Longitudinal canals multiple

Valves are large and linear, with cuneate apices. Valve margins are nearly parallel. Areolae are transapically expanded near the valve margin. Multiple longitudinal canals run the length of the valve margin.