Diatoms of North AmericaDiatoms of North America
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Guide to Prestauroneis protracta

(Grunow) I.W.Bishop, Minerovic, Q.Liu and Kociolek 2017

Prestauroneis Protracta Guide
Credit: Ian Bishop
  1. Apices rostrate
  2. Striae weakly radiate to parallel
  3. Striae less dense near central area
  4. Proximal raphe ends expanded
  5. Central area small, elliptic

Valves are linear to linear-lanceolate with rostrate, rounded apices. Striae are weakly radiate to parallel at the apices. Striae are less dense in the middle third of the valve. Central area is small and elliptic. The raphe is straight and the proximal ends are expanded.