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Guide to Navicula slesvicensis

Grunow in Van Heurck 1880

Navicula Slesvicensis Guide
Credit: Loren Bahls, Marina Potapova
  1. Valves linear-elliptic to linear-lanceolate
  2. Central area transversely elliptic or irregularly rhomboid
  3. External proximal raphe ends dilated
  4. Central nodule symmetric
  5. Areolae visible under LM

Valves are linear-elliptic to linear-lanceolate, with apices that are wedge-shaped in short specimens and more produced and subrostrate in longer specimens. The central area is transversely elliptic or irregularly rhomboid. External proximal raphe endis are dilated. The central nodule is symmetric. Striae are radiate in the valve center, more widely spaced around the central area and convergent at the apices. The areolae are visible under LM, approximately 25 in 10 μm.