Diatoms of North AmericaDiatoms of North America
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Guide to Gomphonema insularum

Kociolek, Woodward and Graeff 2016

Gomphonema Insularum Guide
Credit: Melissa Vaccarino
  1. Valves linear-lanceolate
  2. Stigmoid present
  3. Axial area is broadly lanceolate
  4. Striae short

Valves are linear-lanceolate with a narrowly rounded headpole and footpole. Striae are short and weakly radiate. The axial area is wide and broadly lanceolate. A single stigmoid is present.