Diatoms of North AmericaDiatoms of North America
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Guide to Tursiocola costata

Frankovich and M.J.Sullivan 2015

Tursicola costata guide
  1. Costae elevated
  2. Striae convergent
  3. Apices rostrate
  4. Valves slightly heteropolar

This species has distinct costae that are greatly elevated above the valve face. Raised costae are easily observed in cleaned valves and frustules in girdle view. Striae are strongly convergent across the valve face. Apices are rostrate. External, proximal raphe ends are deflected in SEM. Valves are slightly heteropolar.